2012 Virginia Residential Code Significant Code Changes

2012 Virginia Residential Code Significant Code Changes
4/12/2017 2012 Virginia Residential Code Significant Code Changes Presented by Arlington County Inspection Services Division Produced with Virginia Department of Housing and Community Development Jack A. Proctor Virginia Building Code Academy and Virginia Building Code Officials Association Welcome to the 2012 Virginia Residential Code (VRC) training to introduce significant technical code changes to the 2012 Virginia Uniform Statewide Building Code (VUSBC) Part I Virginia Construction Code (VCC) from the 2009 Virginia Residential Code to the 2012 Virginia Residential Code editions. Please reference the 2012 VRC for exact code language.

Welcome! ISD intends training to be interactive and participatory.
4/12/2017 Welcome! ISD intends training to be interactive and participatory. ISD welcomes and encourages comments and/or questions regarding training content. Housekeeping… If not already done, please turn all cell phones to vibration, silent, or off modes. Should it be necessary, restrooms are located… 2

Agenda Significant Technical Changes from 2009 to 2012 Code Editions
4/12/2017 Agenda Significant Technical Changes from 2009 to 2012 Code Editions Includes International Residential Code (IRC) and Virginia Residential Code (VRC) Includes Chapter 2 Definitions through Chapter 10 Chimneys and Fireplaces Highlights Virginia State Amendments This presentation reviews significant code changes to the 2012 Virginia Residential Code (VRC), including those to the 2012 International Code Council International Residential Code (IRC) and the 2012 Virginia Uniform Statewide Building Code as Virginia State Amendments. This presentation includes 2012 VRC Chapter 2 Definitions through Chapter 10 Chimneys and Fireplaces. 2012 VRC Chapter 1 Administration, Chapter 11 Energy, and Chapter 12 through Chapter 43 regarding trades disciplines are not included in this presentation. Please note specific Virginia State Amendments with Section Titles highlighted in yellow text. This presentation organized in Chapter and Section order. Virginia State Amendment 3

Chapter 2 Definitions 4 4/12/2017
All definitions located in Chapters 2 through 10 consolidated in Chapter 2. Miscellaneous definitions in remaining Chapters may be located throughout. Definitions 4

4/12/2017 R202 Definitions Attic, Habitable – finished or unfinished area not considered Story and occupiable area compliant with certain criteria Floor area per Section R304 70 square feet minimum Ceiling height per Section R305 50% required floor area of 7 feet minimum 0% required floor area below 5 feet Enclosure with: Roof assembly above Floor-ceiling assembly below Knee walls to sides as applicable Habitable Attic defined as finished or unfinished area not considered Story and complying with all 3 criteria: Occupiable floor area of 70 square feet minimum per Section R304 Occupiable floor area with ceiling height of 7 feet minimum at 50% required floor area per Section R305 and Occupiable space enclosed by roof assembly above, floor-ceiling assembly below, and knee walls on sides as applicable. Attic defined as unfinished space between ceiling assembly of top story and roof assembly. Story defined as that portion of buildings included between upper surface of floor and upper surface of floor or roof next above. 5

4/12/2017 R202 Definitions Attic, Habitable definition limited habitable attics in dwellings or townhouses with 3 stories minimum above grade plane to: 2/3 area maximum of story below or 400 square feet maximum 1st 2nd Attic 2 Stories / 3 Floors 3 Stories / 4 Floors Hab 3rd 5 Floors Basement Above Grade Basement Above Grade Basement Below Grade The definition of Attic, Habitable included language to prohibit habitable attics exceeding 2/3 area maximum of story below or 400 square feet maximum in dwellings or townhouses having three stories minimum above grade plane. This limitation not applied to dwellings or townhouses having 2 or less stories above grade plane.

Example 1 Given: Analysis: 3 stories above grade plane
12/12 pitch hip roof 3rd floor area = 30’x36’ = 1080 sq ft Analysis: 520 sq ft < 2/3x1080 sq ft < 720 sq ft but 520 sq ft > 400 sq ft 12” 12” Hab Attic 3rd 2nd 1st Basement Below Grade 5 FT Example 1 depicts habitable attic limitations defined and described in previous slide. The definition of Habitable Attic not applicable and not allowed in this case. Attic = 20 FT x 26 FT = 520 SQ FT 3 Stories / 5 Floors 5 FT 5 FT 30 FT Habitable attic not allowed 5 FT 7 36 FT

Habitable attic allowed
Example 2 Given: 2 stories above grade plane 8/12 pitch gable roof 2nd floor area = 26’x32’ = 832 sq ft Analysis: 352 sq ft < 2/3x832 sq ft < 554 sq ft and 352 sq ft < 400 sq ft 12” 8” Hab Attic 2nd 1st Basement Above Grade 7.5 FT Example 2 depicts habitable attic limitations defined and described in previous slide. The definition of Habitable Attic applicable and allowed in this case. 3 Stories / 4 Floors Attic 11 FT x 32 FT = 352 SQ FT 26 FT Habitable attic allowed 7.5 FT 8 32 FT

4/12/2017 R202 Definitions Basement – any story not defined as Story Above Grade Plane Basement defined as any story not defined as Story Above Grade Plane. Story Above Grade Plane defined as any story having its finished floor surface entirely above grade plane, or in which finished floor surface directly above is: Greater than 6 feet above Grade Plane or Greater than 12 feet above finished ground level at any point. Grade Plane defined as reference plane representing average of finished ground levels adjoining building at all exterior walls. Additionally, where finished ground level slopes away from exterior walls, established reference plane is: At lowest ground point between building and lot line or At lowest ground point between building and point 6 feet from building where lot line is located greater than 6 feet from building. 9

4/12/2017 R202 Definitions Story Above Grade Plane – any story with finished floor entirely above Grade Plane or with finished floor directly above: 6 feet minimum above Grade Plane or 12 feet minimum above finished ground level at any point Basement Story Above Grade Plane Story Above Grade Plane defined as any story having its finished floor surface entirely above grade plane, or in which finished floor surface directly above is: Greater than 6 feet above Grade Plane or Greater than 12 feet above finished ground level at any point. Story Above Grade Plane defined as any story with finished floor entirely above exterior grade or where finished floor of story directly above exceeds 6 feet above grade plane (an average of perimeter grade) or where any portion exceeds 12 feet above exterior grade. Story Above Grade Plane deleted second defining option in which finished floor surface directly above is greater than 6 feet above finished ground level for more than 50% of total building perimeter. Grade Plane defined as reference plane representing average of finished ground levels adjoining building at all exterior walls. Additionally, where finished ground level slopes away from exterior walls, established reference plane is: At lowest ground point between building and lot line or At lowest ground point between building and point 6 feet from building where lot line is located greater than 6 feet from building. This diagram depicts how Basement and Story Above Grade Plane are determined based on Grade Plane. < 6’ >12’ Above Ground Level Grade Plane 10

4/12/2017 Understand Grade Plane to determine basements or stories relative to grade plane Grade Plane – reference plane representing average of finished ground levels adjoining building at all exterior walls Grade Plane defined as reference plane representing average of finished ground levels adjoining building at all exterior walls. Additionally, where finished ground level slopes away from exterior walls, established reference plane is: At lowest ground point between building and lot line or At lowest ground point between building and point 6 feet from building where lot line is located greater than 6 feet from building. Although not new or revised definition, this diagram depicts how to determine Grade Plane. 6’ 6’ Lot Line > 6’ Lot Line ≤ 6’ Grade Plane Grade Plane Average Grade 11

4/12/2017 Grade Plane where finished ground level slopes away from exterior walls, established reference plane to be at lowest ground point between building and: Lot line or 6 feet from building where lot line located beyond 6 feet minimum from building Grade Plane defined as reference plane representing average of finished ground levels adjoining building at all exterior walls. Additionally, where finished ground level slopes away from exterior walls, established reference plane is: At lowest ground point between building and lot line or At lowest ground point between building and point 6 feet from building where lot line is located greater than 6 feet from building. Although not new or revised definition, this diagram depicts how to determine Grade Plane. 6’ 6’ Lot Line > 6’ Lot Line ≤ 6’ Grade Plane Grade Plane Average Grade 12

4/12/2017 R202 Definitions Exterior Wall Covering – material or assembly of materials applied to exterior face of exterior wall for purposes of: Weather resistance Insulative protection Aesthetic characteristics Pan Flashing – corrosion-resistant flashing located at opening base and integrated into exterior wall to direct water to exterior Exterior Wall Covering defined as material or assembly of materials applied to or installed on exterior faces of exterior walls for purposes of providing weather-resistive or insulative barriers and aesthetics. Such exterior wall covering materials included veneer, siding, EIFS, architectural trim, architectural embellishment, cornice, soffit, and fascia. Pan Flashing defined as corrosion-resistant flashing at base of opening that is integrated into building exterior wall to direct water to exterior. Such pan-flashing materials may be premanufactured, fabricated, formed or applied at job site. 13

4/12/2017 R202 Definitions Guestroom – any room or rooms used or intended for use by 1 minimum guest for living or sleeping purposes Lodging House – single family dwelling with 1 minimum primarily permanent occupant who exchanges rent payments for guestroom Guestroom defined as any room or rooms used or intended for use by one or more guests for living or sleeping purposes. Lodging House defined as single family dwelling where one or more occupants are primarily permanent in nature and rent payments are exchanged for guestrooms. 14

4/12/2017 R202 Definitions Local Exhaust – exhaust system with 1 minimum fan to exhaust air from specific room or rooms in dwellings Whole-House Mechanical Ventilation System – exhaust or supply system designed to mechanically exchange indoor and outdoor air to satisfy ventilation rate and operated continuously or intermittently Local Exhaust defined as exhaust system that uses one or more fans to exhaust air from one or more specific room or rooms within dwellings. Whole-House Mechanical Ventilation System defined as exhaust system, supply system, or combination system thereof, that is designed to mechanically exchange indoor air for outdoor air when operating continuously or through programmed intermittent schedules to satisfy whole-house ventilation rate. Whole-House Mechanical Ventilation System also referred to in Chapter 11 Section N 15

4/12/2017 R202 Definitions Nosing – leading edge of tread on stair and of landing at top of stairway flight and formerly referred to as tread profile Riser – vertical component of step or stair Nosing defined as leading edge of tread on stair and of landing at top of stairway flight. Nosing formerly referred to as tread profile. Riser defined as vertical component of step or stair. 16

4/12/2017 R202 Definitions Photovoltaic Modules / Shingles – roof covering composed of flat-plate photovoltaic modules fabricated into shingles Photovoltaic Modules / Shingles defined as roof covering composed of flat-plate photovoltaic modules fabricated into shingles. 17

4/12/2017 R202 Definitions Vapor Permeable – property of having moisture vapor permeance rating of 5 perms minimum Wind-Borne Debris Region – area within designated hurricane-prone region Vapor Permeable defined as property of having moisture vapor permeance rating of 5 perms minimum when tested per desiccant method of ASTM E96 Procedure A. Such vapor permeable materials required to permit passage of moisture vapor. Wind-Borne Debris Region defined as area within hurricane-prone region as designated per Figure R301.2(4)C Wind-Borne Debris Regions. 18

4/12/2017 R202 Definitions Nonpotable Fixtures and Outlets – fixtures and outlets not dependent upon potable water to safely perform intended use Nonpotable Water Systems – water systems for collection, treatment, storage, distribution, and use or reuse of potable water Virginia State Amendments Nonpotable Fixture and Outlet defined as fixture or outlet that is not dependent on potable water for safe operation to perform intended use. Such nonpotable fixtures and outlets included water closets, urinals, mechanical equipment, irrigation, and hose connections to perform operations such as lawn maintenance and vehicle washing. Nonpotable Water System defined as water systems for collection, treatment, distribution, storage, and use or reuse of nonpotable water. Such nonpotable water systems included reclaimed water, rainwater, and gray water systems. Virginia definitions added and correlated with added Virginia Code Sections P2909, P2910, and P2911 regarding Non-Potable Water Systems. 19

R202 Definitions Gray Water – waste water discharged from: Lavatories
4/12/2017 R202 Definitions Gray Water – waste water discharged from: Lavatories Bathtubs Showers Clothes washers Laundry trays Virginia State Amendment Gray Water defined as waste water discharged from lavatories, bathtubs, showers, clothes washers, and laundry trays. Virginia definition of Gray Water added and correlated with added Virginia Code Sections P2909, P2910, and P2911 regarding Non-Potable Water Systems. 20

4/12/2017 R202 Definitions Rainwater – natural precipitation from roof surfaces only Stormwater – precipitation discharged across land surface or through conveyances to 1 minimum waterway Virginia State Amendments Rainwater defined as natural precipitation from roof surfaces only. Such rainwater included snow melt. Stormwater defined as precipitation that is discharged across land surface or through conveyances to one or more waterways. Such stormwater included stormwater runoff, snow melt runoff, and surface runoff and drainage. Virginia definitions added and correlated with added Virginia Code Sections P2909, P2910, and P2911 regarding Non-Potable Water Systems. 21

4/12/2017 R202 Definitions Structural Composite Lumber – structural members manufactured with wood elements bonded with exterior adhesives Included definitions of: Laminated Veneer Lumber (LVL) Parallel Strand Lumber (PSL) Laminated Strand Lumber (LSL) Oriented Strand Lumber (OSL) Structural Composite Lumber defined as structural members that are manufactured using wood elements bonded together with exterior adhesives. Such structural composite lumber materials included different types of structural composite lumber and are further defined as Laminated Veneer Lumber (LVL), Parallel Strand Lumber (PSL), Laminated Strand Lumber (LSL), and Oriented Strand Lumber (OSL). LVL – Composite of wood veneer elements with wood fibers primarily oriented along member length PSL – Composite of wood strand elements with wood fibers primarily oriented along member length having certain strand size limitations of .25 inch x 300x LSL – Composite of wood strand elements with wood fibers primarily oriented along member length having certain strand size limitations of .10 inch x 150x OSL – Composite of wood strand elements with wood fibers primarily oriented along member length having certain strand size limitations of .10 inch x 75x to 150x Sections R , R , and R Structural Composite Lumber require structural capacities and to be established and monitored per ASTM D 5456. Performance Category defined as designation of wood structural panels related to panel performance referred to in Chapters 4, 5, 6, and 8. 22

4/12/2017 R202 Definitions Third-Party Certification Agency – approved agency operating product or material certification systems with initial product testing and assessment and surveillance of manufacturer’s quality control systems Third-Party Certified – certification obtained by manufacturer indicating function and performance characteristics of products or materials by approved third-party certification agency Third-Party Tested – procedure where approved testing laboratory documents products, materials, or systems conform to specified requirements Third-Party Certification Agency defined as approved agency operating product or material certification systems that incorporate initial product testing, assessment, and surveillance of manufacturer’s quality control systems. Third-Party Certification Agency applied primarily to modular housing and industrialized buildings. Third-Party Certified defined as certification obtained by manufacturer indicating that function and performance characteristics of products or materials were determined by initial testing and ongoing surveillance by approved third-party certification agency. Third-Party Tested defined as procedure by which approved testing laboratory provides documentation that products, materials, or systems conform to specified requirements. 23

Chapter 3 Building Planning
4/12/2017 Chapter 3 Building Planning 23

R301.2.1 Wind Design Criteria Wind speeds correlated with 2010 ASCE 7
4/12/2017 R Wind Design Criteria Wind speeds correlated with 2010 ASCE 7 90(40) 100(45) 110(49) Wind speeds correlated to align with 2010 American Society of Civil Engineers (ASCE) 7. Majority of Virginia areas designated at 90 MPH, however Eastern Shore and Far Southeast areas designated at higher wind design criteria. Special wind region located in Southwest area. 24

R302.2.2(2) Parapets Exception:
4/12/2017 R (2) Parapets Exception: Parapets for townhouses not required where: Class C minimum roof covering Non-combustible roof decking or sheathing for 4 feet minimum on both sides of common wall No roof openings or penetrations within 4 feet minimum of common fire-resistant wall No roof openings or penetrations allowed within 4 feet minimum of common walls in townhouses. Penetrations in Type X gypsum board prohibited although commonly created to repair roof sheathing cut out at ridge vents. Approved fire-retardant-treated wood or Type X gypsum board installed directly beneath roof decking or sheathing may be applied in lieu of non-combustible materials for 4 feet minimum on both sides of common wall. 25

R303.4 Mechanical Ventilation
4/12/2017 R303.4 Mechanical Ventilation Whole-house mechanical ventilation system required in dwellings where: Air infiltration rate is less than 5 air changes per hour Tested with blower door at 0.2 inch pressure Installed per Section M1507.3 Whole-House Mechanical Ventilation System defined as exhaust system, supply system, or combination thereof, designed to mechanically exchange indoor air for outdoor air when operating continuously or through programmed intermittent schedule to satisfy whole-house ventilation rate. Whole-House Mechanical Ventilation System definition as applicable in Chapter 11 referred to Section N Prescriptive ventilation requirements located in Section M1507. Blower door test required to be at pressure of 0.2 inch per Section N 26

R308.4 Hazardous Locations Glazing at hazardous locations:
4/12/2017 R308.4 Hazardous Locations Glazing at hazardous locations: Section reorganized for ease of reading Multiple SubSections with titles added Multiple lists with various criteria and exceptions reduced Stair landings at top of stairs not considered hazardous locations Section R308.4 Hazardous Locations reorganized into multiple Subsections for ease and convenience. Section R308.4 Hazardous Locations reduced multiple lists having multiple criteria and exceptions. Hazardous location criteria and glazing height requirements deleted at landings at top of stairs. 27

R308.4.6 Glazing Adjacent to Stairs and Ramps
4/12/2017 R Glazing Adjacent to Stairs and Ramps Glazing considered hazardous location where adjacent to: Stairways Landings between flights of stairs Ramps and located where: Bottom of exposed edge 36 inches maximum vertically above plane of adjacent walking surface plane Exception: Glazing located 36 inches minimum horizontally from walking surface Hazardous location criteria and language deleted within 36 inches horizontally of a walking surface … when the exposed surface of the glazing is less than … Hazardous location criteria and language revised when exposed surface of glazing is less than 60 inches to when bottom of exposed edge of glazing is less than 36 inches above plane of adjacent walking surface. Hazardous location criteria revised glazing height requirements above adjacent walking surface plane from less than 60 inches to less than 36 inches. From …where bottom edge of glazing to adjacent walking surface is less than 60 inches above… to …is less than 36 inches above adjacent walking surface… 28

4/12/2017 R Glazing Adjacent to Stairs and Ramps Height criteria for hazardous location revised from 60 inches to 36 inches maximum: From …where bottom edge of glazing to adjacent walking surface is less than 60 inches above… to …is less than 36 inches above adjacent walking surface… Stair landing at top of stairs not considered hazardous location Hazardous location criteria and glazing height requirements correlated from less than 60 inches above to less than 36 inches above with guard heights allowed per Section R Glazing Adjacent to Stairs and Ramps Exception. 29

4/12/2017 R Glazing Adjacent to Stairs and Ramps This diagram depicts glazing requirements adjacent to stairways and ramps mentioned in previous slide. 29

R308.4.7 Glazing Adjacent to Bottom Stair Landings
4/12/2017 R Glazing Adjacent to Bottom Stair Landings Glazing considered hazardous location where adjacent to: Landings at bottom of stairways and located where: 36 inches maximum vertically above stair landings Measured from bottom stair landings not tread nosings 60 inches maximum horizontally of bottom stair treads Measured from bottom stair treads not in any direction Exception: Glazing protected with guards per Section R312 Guards and Window Fall Protection Located 18 inches minimum from guards Hazardous location criteria and glazing height requirements revised and correlated with 36 inch dimension for stairs, intermediate landings, and ramps based on Section R Glazing Adjacent to Bottom Stair Landings Exception for 36 inch guards. Hazardous location criteria revised glazing height requirements from less than 60 inches to less than 36 inches: From …less than 60 inches above tread nosing to …less than 36 inches above landing. Hazardous location criteria deleted language in any direction and extended 60 inches from bottom tread. Horizontal measurement from bottom treads not in any direction. Vertical measurement from bottom landings not tread nosing. Exception allowed for glazing protected with guards per Section R312 Guards and Window Fall Protection. 30

4/12/2017 R Glazing Adjacent to Bottom Stair Landings Height criteria for hazardous location revised from 60 inches to 36 inches maximum: From …less than 60 inches above tread nosing to …less than 36 inches above landing Horizontal dimension measured from bottom tread not in any direction Vertical dimension measured from bottom landing not tread nosing Hazardous location criteria and glazing height requirements correlated with 36 inch dimension for stairs, intermediate landings, and ramps based on Section R Glazing Adjacent to Bottom Stair Landings Exception for 36 inch guards. Hazardous location criteria deleted language in any direction and extended 60 inches from bottom treads. Horizontal measurement from bottom treads not in any direction. Vertical measurement from bottom landings not tread nosing. 32

4/12/2017 R Glazing Adjacent to Bottom Stair Landings This diagram depicts glazing requirements adjacent to bottom stairway landings mentioned in previous slide. 31

R308.6.1 Tubular Daylighting Device
4/12/2017 R Tubular Daylighting Device Non-operable fenestration unit primarily designed to transmit daylight from roof surface to interior ceiling via tubular conduit Tubular Daylighting Device (TDD) defined as non-operable fenestration unit primarily designed to transmit daylight from roof surface to interior ceiling via tubular conduit. Basic TDDs consisted of exterior glazed weathering surface, light transmission tube with reflective interior surface, and interior translucent sealing device such as translucent ceiling panel. TDD may be factory assembled or field assembled from manufacturer kit. 32

R310.2.2 Drainage Window wells to be designed for proper drainage:
4/12/2017 R Drainage Window wells to be designed for proper drainage: By connection to building foundation drainage systems per Section R405.1 Concrete or Masonry Foundations By approved alternative methods Exception: Where foundations located on Group I well-drained or sand-gravel soils per Table R405.1 Properties of Classified Soils Drainage requirements deleted drainage loop hole not specifically addressed in 2009 VRC edition.

4/12/2017 R Interior Passage Interior passage routes in dwelling units with both living / entertainment area and kitchen on same level as required egress door to provide access to: Living / Entertainment area Kitchen and where provided on same level as living / entertainment area and kitchen: 1 bedroom minimum 1 bathroom minimum with water closet, lavatory, and bathtub or shower Virginia Statewide Amendment added for visitability – similar to accessibility without full requirements. Where dwelling units have both kitchen and living or entertainment areas on same level as egress doors required by Section R311.2 Egress Door, interior passage routes required to be provided from such egress doors to kitchen and living or entertainment areas and to at least one bedroom and at least one bathroom containing water closet, lavatory, and bathtub or shower, where such rooms are provided on that same level. 34

4/12/2017 R Interior Passage Interior passage routes to provide access to those required areas with: Doors of 34 inch minimum nominal width Cased openings of 34 inch minimum clear width Exceptions: Doors or cased openings located at end and facing length of interior passage routes / access hallways not of adequate accommodating width Doors or cased openings serving closets Doors or cased openings serving pantries Doors serving bathrooms accessed directly from bedrooms not required to comply Virginia State Amendment Any doors or cased openings along such interior passage route providing access to those areas identified above required to comply with following: Cased openings shall provide 34 inch minimum clear width. Doors shall be 34 inch minimum nominal width. Exceptions: Doors or cased openings, and associated molding or trim, located at end and facing length of hallways where width of hallways not wide enough to accommodate such doors or cased openings. Closet doors or cased openings. Pantry doors or cased openings. Bathroom doors accessed directly from bedrooms not required to comply with this Section. 35

Example 1 Example 1 depicts where Doors/Openings 1 through 4 required to comply with minimum width requirements and no exceptions applied to this particular arrangement. 36

Example 2 Example 2 depicts where:
Door/Opening 1 required to comply with minimum opening requirements Door/Opening 2 required to comply with minimum opening requirements Only 2 of 3 of Doors 3 required to comply with minimum opening requirements as only one bedroom required to comply and be accessible. Door 4 not required to comply with minimum opening requirements as Door 4 located at end of and facing 36 inch wide access hallway not having adequate width per Exception 1. 37

Example 3 Example 3 depicts where:
Door 3 not required to comply with minimum opening requirements as Door 3 located at end of and facing 36 inch access hallway not having adequate width per Exception 1. Door 4 not required to comply with minimum opening requirements as Door 4 located within non-required inaccessible bedroom per Exception 4. 38

R311.3.1 Floor Elevation at Required Egress Doors
4/12/2017 R Floor Elevation at Required Egress Doors Landings or finished floors at required egress doors to be 1½ inch maximum below top of door thresholds Exception: Landings or finished floors at 8¼ inch maximum below top of door thresholds where: On exterior side Not having door swings over landings or floors (door swings to interior side) Virginia State Amendment correlated floor elevation/threshold requirements to align with for stair profiles and riser dimensions of 7 ¾ inches to 8 ¼ inches. 39

R311.7.6 Landing for Stairways
4/12/2017 R Landing for Stairways Landings or floors to be located at top and bottom of each stairway Depth parallel to travel to be 36 inches minimum Width perpendicular to travel to be equal to stair width served minimum Exception: Landings at top of interior stairways without door swing over stairs not required Stairway landing depths in direction of travel required to be 36 inches minimum to prevent overstepping, similar to existing requirements for stairways having straight runs. Stairway landing widths across direction of travel required to be equal to widths of stairways served minimum. Square or rectangular stairway landings limited minimum angle of turns to 90 degrees minimum for 36 inches minimum. Stairway landings or floors at top of stairs not required for interior flights of stairs, including within enclosed garages, provided no door swings over stairs. 40

4/12/2017 R Landing for Stairways Curve, angle, geometry, or shape other than square or rectangle allowed where: Depth at walkline equal to minimum of depth at walkline for required rectangular landing Area at landing equal to minimum of quarter circle with radius equal to required landing width Other curved, angular, or geometrically-shaped stairway landings having turns of 90 degrees maximum may be allowed given depth of tread at walkline and total landing area equal hypothetical dimension of quarter circle having radius equal to stairway width. Stairway landings of shapes other than square or rectangular may be allowed provided depth at walk line and total landing area are not less than that of quarter circle having radius equal to required landing width. Two examples depict acceptable landings having shapes and configurations other than squared or rectangular. 41

4/12/2017 R Landing for Stairways Figure R (2) Example of Landings Of Other Shapes Area Walkline This diagram depicts acceptable landings having shapes and configurations other than squared or rectangular. Section R Landings for Stairways not intended to require specifically shaped landings which may have curved or segmented periphery edges. Stairway landing widths measured perpendicular to direction of travel and required to be equal to width of stairways served minimum. Landings of shapes other than square or rectangular may be allowed provided depth at walk line and total landing area are not less than that of quarter circle having radius equal to required landing width. Other curved, angular, or geometrically-shaped landings having turns of 90 degrees maximum may be allowed given depth of tread at walkline and total landing area equal hypothetical dimension of quarter circle having radius equal to stairway width. Space required to safely turn and navigate stairways at connecting stair flights governed by walkline depth and landing area. Walkline 42

4/12/2017 R Landing for Stairways Required landing walkline and area to safely turn and navigate stairways Walkline Area Walkline This diagram depicts acceptable landings having shapes and configurations other than squared or rectangular. Section R Landings for Stairways not intended to require specifically shaped landings which may have curved or segmented periphery edges. Stairway landing widths measured perpendicular to direction of travel and required to be equal to width of stairways served minimum. Landings of shapes other than square or rectangular may be allowed provided depth at walk line and total landing area are not less than that of quarter circle having radius equal to required landing width. Other curved, angular, or geometrically-shaped landings having turns of 90 degrees maximum may be allowed given depth of tread at walkline and total landing area equal hypothetical dimension of quarter circle having radius equal to stairway width. Space required to safely turn and navigate stairways at connecting stair flights governed by walkline depth and landing area. 43

4/12/2017 Understand Walkline to determine curved, angular, or geometrically shaped stair landings other than squared or rectangular Measured 12 inches minimum along stair nosing from extreme clear stair width Walkline Walkline Walkline Walkline Walkline defined as hypothetical standardized designation concentric to curved direction of travel through the turn and located 12 inches from narrow side of winder treads, with 12 inches measured from widest point of clear stair width at walking surface of winder treads. Walklines measured along each nosing at 12 inches minimum from extreme clear stair width at surface of winder tread. Additionally, point of widest clear stair width of adjacent winders used if winders adjacent within stairway flight. Walklines established concentrically, or having the same center, or approximately parallel to arc of travel path. Each footfall through turns may be connected in arc to describe travel path, with consistent foot turns at each tread. Minimum tread depths and walkline tread depths both governed tread depths, turn angles, and flight configurations. Although not new or revised definition, this diagram depicts how to determine Walkline. 44

4/12/2017 Examples of Walklines Additional examples depict hypothetical walkline locations on various stairway configurations. 47

R314.1 Smoke Detection and Notification
4/12/2017 R314.1 Smoke Detection and Notification Physical interconnection of smoke alarms not required where wireless interconnection provided Wireless smoke alarms allowed when installed per manufacturer specifications. 45

R315.2 Carbon Monoxide Detection Systems
4/12/2017 R315.2 Carbon Monoxide Detection Systems Household carbon monoxide (CO) detection system allowed where equipment: Owned by homeowner Affixed permanently within occupancy Monitored by approved supervising station Installed per NFPA 720 Listed and labeled per UL 2075 Carbon monoxide systems offered alternatives to self contained CO alarms. Carbon monoxide systems required to be installed per NFPA 720 and listed and labeled per UL 2075. 46

4/12/2017 R316.4 Thermal Barrier Foam plastics to be separated from interior spaces with approved thermal barriers: ½ inch minimum gypsum wallboard Other materials tested and accepted per NFPA 275 Section R316.4 referenced Standard NFPA 275 in lieu of prescriptive requirements. NFPA 275 developed to specifically to test various materials to qualify as thermal barriers. Materials other than ½” gypsum board may be approved when tested and accepted per both NFPA 275 Temperature Transmission Fire Test and Integrity Fire Test. Not intended to potentially limit alternative materials. 47

4/12/2017 R Attics Thermal barriers per Section R316.4 Thermal Barriers not required in attics where complying with certain criteria Foam plastic insulation to be protected against ignition with 1 of 7 listed ignition barrier materials: Included 1½ inch thick cellulose insulation Ignition barrier allowed in lieu of thermal barrier requirement. 1½ inch cellulose insulation added to list of ignition barriers to be accepted in lieu of thermal barrier requirements of Section R316.4 Thermal Barrier. 48

4/12/2017 R317.3 Fasteners and Connectors in Contact with Preservative-Treated and Fire-Retardant-Treated Wood Fasteners, connectors, and nuts and washers to be approved for contact with preservative-treated wood, fire retardant treated wood, and wood foundations Referred to Sections R through R Zinc-coated fasteners required to be of coating weights per ASTM A 153. Sections R through R applied specifically to types of treated wood in contact with fasteners or connectors. R Fasteners for Wood Foundations required fasteners for wood foundations per American Forest and Paper Association (AFPA) Permanent Wood Foundation Design Specification (PWF). 49

R317.3.1 Fasteners for Preservative-Treated Wood
4/12/2017 R Fasteners for Preservative-Treated Wood Accepted fasteners: Hot-dipped, zinc-coated galvanized steel Stainless steel Silicon bronze Copper Exceptions: Steel bolts of ½ inch diameter minimum Other fasteners, not nails or timber rivets, of mechanically-deposited zinc-coated steel Plain carbon steel fasteners in dry interior environment for SBX / DOT and zinc borate preservative-treated wood Fasteners required to be per connector manufacturer recommendations. Fasteners, including nuts and washers, for preservative-treated wood required to be of hot-dipped, zinc-coated galvanized steel, stainless steel, silicon bronze, or copper. Exceptions: Steel bolts of ½ inch diameter minimum. Fasteners, other than nails and timber rivets, of mechanically deposited zinc-coated steel of weights per ASTM B 695 Class 55 minimum. Plain carbon steel fasteners, in SBX/DOT and zinc borate preservative-treated wood, in dry interior environments. 50

R317.3.3 – R317.3.4 Fasteners for Fire-Retardant-Treated Wood
4/12/2017 R – R Fasteners for Fire-Retardant-Treated Wood Section R Accepted fasteners in exterior or wet / damp locations: Hot-dipped, zinc-coated galvanized steel Stainless steel Silicon bronze Copper Other fasteners, not nails or timber rivets, of mechanically-deposited zinc-coated steel R Accepted fasteners in interior locations: Per manufacturer recommendations Per Section R above in absence of manufacturer recommendations Fasteners, including nuts and washers, for exterior or wet/damp applications of fire-retardant-treated wood required to be of hot-dipped, zinc-coated galvanized steel, stainless steel, silicon bronze, or copper. Exceptions: Steel bolts of ½ inch diameter minimum. Fasteners, other than nails and timber rivets, of mechanically deposited zinc-coated steel of weights per ASTM B 695 Class 55 minimum. Plain carbon steel fasteners, in SBX/DOT and zinc borate preservative-treated wood, in dry interior environments. 51

R317.4.1 Labeling Wood / Plastic composite materials for exterior:
4/12/2017 R Labeling Wood / Plastic composite materials for exterior: Deck boards Stair treads Handrails Guardrails to be labeled with: Maximum allowable load Maximum allowable span Required performance level Compliant with ASTM D 7032 Wood/Plastic composite deck boards and stair treads components required to be labeled on each board. Wood/Plastic composite handrails and guardrails may be labeled either on materials or packaging. Wood/Plastic composite materials required to be installed per manufacturer installation instructions. 52

R325 Swimming Pools International Swimming Pool and Spa Code (ISPSC) for swimming pool requirements referenced Virginia State Amendment added Section R325 Swimming Pools and deleted reference to Appendix G for Swimming Pools and Spas. Section R325 Swimming Pools referenced International Swimming Pool and Spa Code (ISPSC) for all swimming pool requirements. References to VRC Appendix G Swimming Pools, Spas, and Hot Tubs deleted 53

4/12/2017 Chapter 4 Foundations 54

R405.1 Concrete or Masonry Foundation Drains
4/12/2017 R405.1 Concrete or Masonry Foundation Drains Perforated drains to be surrounded with: Approved filter membranes Filter membranes covering washed gravel or crushed rock that cover drains Exception: Where foundations located on Group I well-drained or sand-gravel soils per Table R405.1 Properties of Soils Classified Perforated drains required to be surrounded with approved filter membranes or alternatively, filter membranes required to cover washed gravel or crushed rock covering perforated drains. Filter membranes or socks may encircle perforated drains without requiring filter cloths over crushed stone or gravel that must cover perforated drains 6 inches minimum. Section exception provided for well-drained or sand-gravel soils classified as Group I soils per Table R405.1 Properties of Soils Classified According to United States Classification System. 55

4/12/2017 R Termite Inspection Unvented crawl spaces to provide clear and unobstructed view of vertical face of sill plate Inspection gap to be provided: Below sill plate at top of interior foundation wall covering Throughout all enclosed foundations 1 inch minimum in width 2 inches maximum in width Exceptions: Areas not subject to termite damage per Table R301.2(1) Climatic and Geographic Design Criteria Areas provided with other approved inspection means Virginia State Amendment added Section R Termite Inspection. Unvented crawl spaces per Section R408 Under-floor Space (and R408.3 Unvented Crawl Space) required to provide clear and unobstructed view of vertical face of sill plate and inspection gap below sill plate along top of interior foundation wall covering. Exceptions: Areas not subject to termite damage per Table R301.2(1) Climatic and Geographic Design Criteria and Figure R301.2(6) Termite Infestation Probability Map Areas providing other approved inspection means. Inspection gaps required to extend throughout all parts of enclosed foundations: 1 inch minimum 2 inches maximum in width. Joints between sill plates and top of interior wall coverings may be sealed. 56

4/12/2017 R Termite Inspection Pier and curtain foundations to provide clear and unobstructed view of interior face of rim joist and sill plate Exception: Fiberglass or similar insulation where easily removable Virginia State Amendment added Section R Termite Inspection. Pier and curtain foundations per Figure R (1) Foundation Wall Clay masonry Wall with Concrete Masonry Piers required to provide clear and unobstructed view of sill plate and interior face of rim joist. Exception: Fiberglass or similar insulation when easily removable. Construction joints may be sealed. 57

Chapter 5 Floors 58

R501.3 Fire Protection of Floors
4/12/2017 R501.3 Fire Protection of Floors Section R501.3 Fire Protection of Floors deleted in entirety Fire protection of non-fire-resistance rated floor assemblies with membranes applied to underside of 2”x8” or less nominal floor framing members not required Referred to Virginia DHCD errata Virginia State Amendment deleted Section R501.3 Fire Protection of Floors in its entirety. Although deleted, accepted fire protection membranes included: 1/2 inch minimum gypsum wallboard 5/8 inch minimum wood structural panel Equivalent fire protective membrane Refer to Virginia Department of Housing and Community Development (DHCD) errata. 59

R502.1.3, R602.1.1, and R802.1.2 End Jointed Lumber
4/12/2017 R , R , and R End Jointed Lumber End-jointed lumber in required fire-resistance rated assemblies to be designated with Heat Resistant Adhesive or HRA within grade mark Also required in: Section R Wall Construction / Wood Framing Section R Roof-Ceiling Construction / Wood Framing End-jointed lumber used in required fire-resistance rated assemblies required to be labeled or marked with HRA or Heat Resistant Adhesive designation within its grade mark. Also required in Sections R Wood Wall Framing and R Roof-Ceiling Construction. 60

R502.3 Allowable Joist Spans
4/12/2017 R502.3 Allowable Joist Spans Tables R (1) and R (2) Floor Joist Spans for Common Lumber Species revised to reflect reduced allowable floor joist spans for Southern Pine lumber Virginia State Amendment reduced allowable joist, girder, and header spans to reflect reduced strength values of Southern Pine lumber. Southern Pine revised to be Number 1 Grade minimum lumber for allowable cantilever, girder, and header spans. Table R (1) Floor Joists Spans for Common Lumber Species relative to 30 psf live load. Table R (2) Floor Joists Spans for Common Lumber Species relative to 40 psf live load. 61

R502.5 Allowable Girder and Header Spans
4/12/2017 R502.5 Allowable Girder and Header Spans Tables R502.5(1) Girder and Header Spans for Exterior Bearing Walls and R502.5(2) Girder and Header Spans for Interior Bearing Walls revised to require Southern Pine Number 1 Grade minimum lumber Table R502.5(3) Girder and Header Spans for Porches added Based on Southern Pine Based on Number 2 Grade minimum lumber Virginia State Amendment reduced allowable joist, girder, and header spans to reflect reduced strength values of Southern Pine lumber. Southern Pine revised to be Number 1 Grade minimum lumber for allowable cantilever, girder, and header spans. Table R502.5(3) Girder and Header Spans for Porches added to address allowable girder and header spans specifically at porches and allowed Southern Pine Number 2 Grade minimum lumber. 62

R502.6 Bearing Ends of joists, beams, and girders to bear on:
4/12/2017 R502.6 Bearing Ends of joists, beams, and girders to bear on: Masonry or concrete directly Sill plate 2 inch minimum nominal thickness 48 square inches minimum nominal bearing area Ends of joists, beams and girders to bear on: Masonry or concrete directly Sill plates on masonry or concrete with 2 inches minimum nominal thickness and 48 square inches minimum bearing area. 63

R503.2.1, R602.3, and R803.2.1 Wood Structural Panel Sheathing Identification and Grade
4/12/2017 Wood structural panels to comply with DOC PS 1 or DOC PS 2 and to be identified by grade mark or certificate of inspection by approved agency with: Grade Bond classification Performance category Also required in: Section R602.3 Wall Construction / Wood Framing Section R Roof-Ceiling Construction / Wood Framing Wood structural panel floor, wall, and roof sheathing also required to be identified with grade, bond classification, and performance category within grade mark or certificate of inspection by approved agency. Wood structural panel floor and roof sheathing required to comply with Table R (1) Allowable Spans and Loads for Wood Structural Panels for Roof and Subfloor Sheathing and Combination Subfloor Underlayment per Sections R503.2 and R803.2. Performance Category value to be used as nominal panel thickness or panel thickness when referenced in Code. 64

R506.2.3 Vapor Retarder Exception 1:
4/12/2017 R Vapor Retarder Exception 1: Vapor retarder allowed to be omitted from: Attached and detached garages Utility buildings Other unheated accessory structures Vapor barrier requirements deleted vapor retarders from all garages, including attached and detached garages. 65

R507 Decks Section R507 Decks relocated and revised from Section R Decks Allowable spans for deck joists and deck beams reduced to reflect wet service conditions Virginia State Amendment relocated and significantly revised Section 507 Decks to include multiple revisions included to Section, Tables, and Figures. Section R507 Decks relocated from Section R Decks and revised, including deck span, beam spans, joist spans, beam sizes, and post heights. Tables added to reflect reduced strength values, wet service adjustments, and reduced allowable span lengths to reflect recently reduced strength values of sawn lumber. 66

R507 Decks Multiple Sections, Tables, and Figures added and revised
Section R507.4 Decking Table R507.4 Maximum Joist Spacing Section R507.5 Deck Joists Table R507.5 Deck Joist Spans and Cantilevers for Common Lumber Species Section R507.6 Deck Beams Table R507.6 Typical Deck Beam Spans Section R507.7 Deck Joist and Deck Beam Bearing Section R Deck Beam to Deck Post Section R507.8 Deck Posts Section R Deck Post to Deck Footing Table R507.8 Deck Post Heights Virginia State Amendment relocated and significantly revised Section 507 Decks to include multiple revisions included to Section, Tables, and Figures. Section R507 Decks relocated from Section R Decks and revised, including deck span, beam spans, joist spans, beam sizes, and post heights. Multiple revisions included to Section, Tables, and Figures. Tables added to reflect reduced strength values, wet service adjustments, and reduced allowable span lengths to reflect recently reduced strength values of sawn lumber. Lateral restraint at supports added. 67

Chapter 6 Wall Construction
68

R602.3 Design and Construction
4/12/2017 R602.3 Design and Construction Section R602.3 Design and Construction revised to include: Components of exterior walls to be fastened per Tables R602.3(1) through R602.3(4) Wall sheathing to be fastened directly to framing members and capable of resisting applicable adjusted wind pressures per Tables R301.2(2) and R301.2(3) where on exterior side of exterior wall Wood structural panel sheathing on exterior wall to comply with DOC PS 1 or DOC PS 2 Wall sheathing for exterior wall covering purposes only to comply with Section R703 Exterior Covering All wall sheathing panels required to be identified with grade, bond classification, and performance category within grade mark or certificate of inspection by approved agency and to comply with Table R602.3(3) Requirements for Wood Structural Panel Wall Sheathing Used to Resist Wind Pressures. Wood structural panel floor and roof sheathing also required to be identified with grade, bond classification, and performance category within grade mark or certificate of inspection by approved agency and to comply with Table R (1) Allowable Spans and Loads for Wood Structural Panels for Roof and Subfloor Sheathing and Combination Subfloor Underlayment per Sections R503.2 and R803.2. 69

R602.3 Design and Construction
4/12/2017 R602.3 Design and Construction Table R602.3(1) Fastener Schedule For Structural Members revised Table R602.3(1) Fastener Schedule for Structural Members revised to include certain building elements, fastener types and quantities, and fastener spacing and location requirements. 70

R602.3.1 Stud Size, Height, and Spacing
4/12/2017 R Stud Size, Height, and Spacing Exception 2 for studs 10 feet minimum in height revised 2”x6” studs at 16” oc allowed to be 18 feet in height 2”x6” studs at 12” oc allowed to be 20 feet in height To be Number 2 Grade minimum lumber To support 1 maximum roof load To support tributary roof load of 6 feet maximum and where: Snow load of 25 psf maximum Ultimate wind design speed of 130 mph maximum Table R Maximum Allowable Length of Wood Wall Studs deleted Section R Stud Size, Height, and Spacing Exception 2 for stud height revised requirements and limitations, including Number 2 Grade lumber minimum and supporting single roof load with tributary load of 6 feet maximum, given snow load of 25 psf maximum and ultimate wind design speed of 130 mph maximum. Table R Maximum Allowable Length of Wood Wall Studs deleted. 71

R602.7 Single Member Headers
4/12/2017 R602.7 Single Member Headers Table R Spans for Minimum Number 2 Grade Single Header added Virginia State Amendment revised allowable span tables to require headers constructed of Southern Pine lumber to be Number 1 Grade minimum lumber. Single member headers allowed under limited load conditions. Single member header required to be framed with flat 2-inch nominal member or wall plate equal to wall stud width above and below minimum. Revision intended to provide increased energy efficiency with additional insulation space. Referred to Table R Spans for Minimum Number 2 Grade Single Header for maximum allowable spans. Exterior Bearing Wall Alternative Framing Without Cripple Wall 72

4/12/2017 R Supports for Headers Headers to be supported on each end with 1 jack stud and 1 king stud minimum King studs to be fastened to each end of headers with 4 -12d nails minimum Virginia State Amendment added regarding supports for headers with jack and king studs. Supports for headers required to be one minimum jack stud plus one king stud on each end of all headers. Each king stud required to be fastened to each end of headers with 4-12d nails minimum. 73

R602.10 Wall Bracing Wall bracing required per 1 of 3 Sections:
4/12/2017 R Wall Bracing Wall bracing required per 1 of 3 Sections: R Wall Bracing R Practical Wall Bracing or R301.1 Design Criteria, including Engineered designs Construction systems Alternative provisions and approved Referenced Standards AFPA WFCM Wood Frame Construction Manual AISI S230 Standard for Cold-Formed Steel Framing – Prescriptive Method ICC 400 Standard on Design and Construction of Log Structures Building Official permitted to waive analysis of upper floors in certain conditions Virginia State Amendment only permitted wall bracing by one of three methods. Section R Wall bracing (as conventionally referred) Section R Practical Wall Bracing (as renamed from Simplified Wall Bracing) Section R301.1 Design criteria, including Engineered designs Construction systems Alternative provisions and approved Referenced Standards AFPA WCFM American Forest and Products Association Wood Frame Construction manual AISI S230 American Iron and Steel Institute Standard for Cold-Formed Steel Framing ICC 400 International Code Council Standard on Design and Construction of Log Structures Section R included multiple revisions. Section R Practical Wall Bracing renamed from Simplified Wall Bracing to Practical Wall Bracing. Simplified universal and practical wall bracing method of circumscribed rectangle with no prerequisites or size limitations and may be more conservative. Provision added for building official to waive analysis of upper levels where cumulative length of wall openings of each upper level wall is less than or equal to length of wall openings of each lower level wall directly below. Building Official permitted to require braced wall details and analysis or waive analysis of upper floors when cumulative length of wall openings of each upper floor equals or less than length of wall openings of lower floor directly below. 74

R602.12 Practical Wall Bracing
4/12/2017 R Practical Wall Bracing Allowed where compliant with certain wall braced panel criteria: Braced wall panel requirements Sheathing materials Circumscribed rectangles Side bracing lengths Contributing cumulative bracing lengths Common bracing with skewed rectangles Cripple walls Walk-out basement walls Distribution Connections Supports Virginia State Amendment only simplified wall braced panel requirements and not applied to 2012 or 2015 ICC/IRC. Section R Practical Wall Bracing added and renamed from 2012 IRC Simplified Wall Bracing to Practical Wall Bracing. Practical wall bracing allowed when compliant with certain braced wall panel criteria: Braced wall panel requirements Sheathing materials Circumscribed rectangles Side bracing lengths Contributing cumulative bracing lengths Common bracing with skewed rectangles Cripple and walk-out basement walls Distribution Connections and Supports. Approved exterior sheathing materials required to be: 7/16 inch minimum wood structural panels fastened per table R602.3(3) Requirements for Wood Structural Wall Panel Sheathing ½ inch minimum structural fiberboard fastened per Table R602.3(1) Fastener Schedule for Structural Members. Approved interior sheathing materials may be: ½ inch minimum gypsum board fastened per Table R Minimum Thickness and Application of Gypsum Board. 75

4/12/2017 R Practical Wall Bracing Specific braced wall panel requirements: Heights Lengths Joints Methods per Sections R and R Construction Methods for Braced Wall Panels ABW – Alternate braced wall panels PFH – Portal frame with holddowns PFG – Portal frame at garage door openings CS-PF – Continuously sheathed portal frame Interior finish materials ½ inch minimum gypsum board fastened per Table R Minimum Thickness and Application of Gypsum Board Virginia State Amendment only simplified wall braced panel requirements and not applied to 2012 or 2015 ICC IRC. Section R Practical Wall Bracing added and renamed from 2012 IRC Simplified Wall Bracing to Practical Wall Bracing. Practical wall bracing allowed when compliant with certain braced wall panel criteria: Braced wall panel requirements Sheathing materials Circumscribed rectangles Side bracing lengths Contributing cumulative bracing lengths Common bracing with skewed rectangles Cripple and walk-out basement walls Distribution Connections and Supports. Approved exterior sheathing materials required to be: 7/16 inch minimum wood structural panels fastened per table R602.3(3) Requirements for Wood Structural Wall Panel Sheathing ½ inch minimum structural fiberboard fastened per Table R602.3(1) Fastener Schedule for Structural Members. Approved interior sheathing materials may be: ½ inch minimum gypsum board fastened per Table R Minimum Thickness and Application of Gypsum Board. Omitted when required length of wall braced panels determined per Section R Required Length of Bracing multiplied by 1.4. 76

R602.12.3 Circumscribed Rectangles
4/12/2017 R Circumscribed Rectangles Required length of wall bracing to be calculated by circumscribing 1 minimum rectangle around building and/or portions thereof Areas included: Enclosed offsets Enclosed projections Areas excluded: Chimneys Partial height offsets and projections Open areas and structures Each rectangle to be: 80 feet maximum lengths of sides 3:1 ratio maximum between long and short sides Skewed to include angled offsets and projections Virginia State Amendment only simplified wall braced panel requirements and not applied to 2012 or 2015 ICC/IRC. Section R Practical Wall Bracing added and renamed from 2012 IRC Simplified Wall Bracing to Practical Wall Bracing. Simplified universal and practical wall bracing method of circumscribed rectangle with no prerequisites or size limitations and may be more conservative. Provision added for building official to waive analysis of upper levels where accumulative length of wall openings of each upper level wall is less than or equal to length of wall openings of each lower level wall directly below. 77

Upper floor wall braced panel analysis not required where: Approved per Building Official Upper floor ceiling height ≤ lower floor ceiling height Upper floor window area ≤ lower floor window area Virginia State Amendment only simplified wall braced panel requirements and not applied to 2012 or 2015 ICC/IRC. Consider in today’s residential construction, many perimeter walls may not stack directly from level to level, may not be full height walls, but triangular walls, and may often cause gable roofs to intersect other gable or shed roofs. Window design typically may stack over levels and may shorten on upper levels. Upon discretion of local building official, second floor analysis may not be required in practical wall bracing method. Required lengths of wall bracing accumulate as lateral loads transmit to ground, therefore more wall bracing required on lower levels and less wall bracing required on upper levels. Experience with classical wall bracing method demonstrated 5% credit adjustment for each 1 foot ceiling height difference. Two prerequisites rendered this feasible, whereas lower level complied so did upper level by default: Upper level ceiling height to be either same or less ceiling height than lower level. Upper level window area to be either same or less window area than lower level. Example: Lower level would have 6’ window height with 9’ ceiling height whereas upper level would have 5’ window height with 8’ ceiling height. 78

Chapter 7 Wall Covering 79

4/12/2017 R Maximum Spans Section R Maximum Spans Condition 4 and Table R Masonry Veneer Height Above Openings added to provide minimum and maximum masonry veneer heights above lintel openings Table R Masonry Veneer Height Above Openings added to specify minimum height of veneer at edges of openings and maximum height of veneer above openings. VRC previously addressed maximum opening width and minimum length of veneer at sides of openings. This provided for adequate transfer of veneer loads to side walls and also limits amounts of veneer supported above openings. This intended to prevent veneer from failing due to its own weight and inadequate support. 80

R703.7.4 Masonry Veneer Anchorage
4/12/2017 R Masonry Veneer Anchorage Table R Tie Attachment and Air Space Requirements added for masonry veneer Table R Tie Attachment and Air Space Requirements added for ease of reading information in abbreviated table format. Minimum and maximum air space requirements combined in Table R Tie Attachment and Air Space Requirements. Maximum horizontal spacing of wall ties increased from 24 to 32 inches. Maximum square footage per wall tie remained at 2.67 square feet. 81

Roof-Ceiling Construction
Chapter 8 Roof-Ceiling Construction 82

R802.4 Allowable Ceiling Joist Spans
Tables R802.4(1) and R802.4(2) Ceiling Joist Spans For Common Lumber Species revised to reflect reduced allowable spans of Southern Pine lumber Virginia State Amendment reduced strength values of Southern Pine lumber and resulted in reduced allowable spans for all Southern Pine primary structural framing, floor joists, ceiling joists, and roof rafters. Sections and Tables amended to reflect recently reduced strength values for Southern Pine lumber. 83

R802.5 Allowable Rafter Spans
Tables R802.5(1) through R802.5(9) Rafter Spans For Common Lumber Species revised to reflect reduced allowable spans of Southern Pine lumber Virginia State Amendment reduced strength values of Southern Pine lumber and resulted in reduced allowable spans for all Southern Pine primary structural framing, floor joists, ceiling joists, and roof rafters. Sections and Tables amended to reflect recently reduced strength values for Southern Pine lumber. 84

4/12/2017 R Sawn Lumber Section R Cantilevered Portions of Rafters relocated Exception from Section R and limited notches: To cantilever length of 24 inches maximum Measured at exterior face of supporting member To retain 3½ inches minimum depth of rafter member at rafter ends / tails Measured parallel to rafter depth Sections R802.7 Cutting, Drilling, and Notching and R Sawn Lumber revised for cuts, notches, and holes in structural roof members per Section R Sawn Lumber (Drilling and Notching of joists), and relocated Section R Exception for cantilever roof rafters. All dimension requirements remained same, except cantilever roof rafter ends/tails. Section R Cantilevered Portions of Rafters relocated Exception from Section R and limited notches to maintain 3½ inches minimum rafter end/tail measured parallel to rafter depth at cantilevered rafter of 24 inches maximum measured from exterior face of supporting member per Figure R Rafter Notch. Section R Ceiling Joist Taper Cut added and limited taper cuts to ¼ depth maximum of ceiling joist member measured from inside face of supporting member per Figure R Ceiling Joist Taper Cut. Cantilever lengths measured at exterior face of supporting member. 85

4/12/2017 R Sawn Lumber Section R Ceiling Joist Taper Cut added and limited taper cuts: To ¼ depth maximum of ceiling joist member Measured at interior face of supporting member Sections R802.7 Cutting, Drilling, and Notching and R Sawn Lumber revised for cuts, notches, and holes in structural roof members per Section R Sawn Lumber (Drilling and Notching of joists). Other dimension requirements remained same. Section R Cantilevered Portions of Rafters relocated Exception from Section R and limited notches to maintain 3½ inches minimum rafter end/tail at cantilevered rafter of 24 inches maximum measured from exterior face of wall stud per Figure R Rafter Notch. Notches limited to retain 3½ inches minimum at rafter end and cantilever length of 24 inches maximum. Section R Ceiling Joist Taper Cut added and limited taper cuts to ¼ depth maximum of ceiling joist member measured from interior face of wall stud per Figure R Ceiling Joist Taper Cut. 86

4/12/2017 R Uplift Resistance Roof assemblies, rafters, and trusses to attach to supporting wall assemblies and provide uplift resistance per Table Rafter or Truss Uplift Connection Forces from Wind Uplift forces to be determined by: Table R Rafter or Truss Uplift Connection Forces from Wind Accepted engineering practice Truss design drawings Individual rafters and trusses required to be attached to supporting wall assemblies with connectors capable of resisting uplift forces. Three options offered to determine rafter or truss uplift: Table R Rafter or Truss Uplift Connection Forces from Wind Accepted engineering practice Truss design drawings. 87

4/12/2017 R Uplift Resistance Alternative allowed to comply with Table R602.3(1) Fastener Schedule for Structural Members where: Uplift force of 200 pound maximum Rafter or truss spacing of 24 inches oc maximum or where: Basic wind speed of 90 mph maximum Wind exposure category of B Roof pitch 5/12 minimum Roof span of 32 feel maximum Individual rafters and trusses required to be attached to supporting wall assemblies with connectors capable of resisting uplift forces. Two fastener alternatives allowed compliance with Table R602.3(1) Fastener Schedule for Structural Members in lieu of Table R Rafter or Truss Uplift Connection Forces From Wind: When uplift force is less than 200 pounds and rafters or trusses are spaced at 24 inches on center maximum. When basic wind speed is 90 mph maximum, wind exposure category is B, roof pitch is 5/12 minimum, roof span is 32 feet maximum, and rafters or trusses are spaced at 24 inches on center maximum. 88

R806.5 Unvented Attic and Unvented Enclosed Rafter Assemblies
4/12/2017 R806.5 Unvented Attic and Unvented Enclosed Rafter Assemblies Allows unvented enclosed rafter assemblies where ceiling is applied directly to rafters To be contained within building envelope Air-impermeable and air-permeable insulation directly under structural roof sheathing to be installed per 1 of 3 conditions ¼ inch vented air space to separate wood shingles or shakes and roof underlayment above structural sheathing Class I vapor retarders not to be installed on ceiling side of assembly Section added terminology and requirements for unvented attics and enclosed rafter assemblies. Condition 2 prohibited interior Class I vapor retarders installed on ceiling side/attic floor of unvented attic assemblies or unvented enclosed rafter assemblies. Condition 5 required compliance with either Condition 5.1 for air-impermeable insulation, 5.2 for air-permeable insulation, or 5.3 both air-impermeable and air-permeable insulation. Condition 5.4 required pre-formed insulation board used as air-impermeable insulation layer to be sealed at perimeter of each individual board on interior surface to form continuous layer. 89

R806.5 Unvented Attic and Unvented Enclosed Rafter Assemblies
4/12/2017 R806.5 Unvented Attic and Unvented Enclosed Rafter Assemblies Condition 5.4 added to allow preformed insulation board as air-impermeable insulation layer Sealed at perimeter edges on ceiling side of each board to form continuous layer Condition 5.4 added for unvented enclosed rafter assemblies. Condition 5.4 required that preformed insulation board used as air-impermeable insulation layer to be sealed at perimeter of each sheet on ceiling side to form continuous layer. 90

Chapter 9 Roof Assemblies
91

4/12/2017 R Locations Flashing to divert water from intersections of sloped roof eaves and vertical sidewalls Sidewall flashing required to divert water away from intersection of sloped roof eaves and vertical sidewalls. 92

4/12/2017 R Sidewall Flashing Base flashing against vertical sidewall to direct water to roof or gutter and to be: Continuous or step method 4 inches in width 4 inches in height and installed per: Section R Water-Resistive Barriers under exterior plaster or adhered masonry veneer Section R Support by Roof Construction under anchored masonry veneer Continuous method under siding Section R Drip Edge deleted Sidewall flashing allowed to be continuous or step flashing. Continuous flashing required to be installed under siding materials. Flashing required to be installed per R Water-Resistive Barriers at exterior plaster or adhered masonry veneer materials. Counterflashing required to be installed per R Support by Roof Construction at anchored masonry veneer materials. Section R Drip Edge deleted. 93

Chimneys and Fireplaces
Chapter 10 Chimneys and Fireplaces 94

4/12/2017 R Smoke Chamber Interior surfaces of masonry fireplace smoke chambers formed with corbelled masonry to be parged smooth Interior surfaces of smoke chambers of masonry fireplaces formed with corbelled masonry required to be parged smooth. Interior construction method specified corbelled masonry whereas none previously specified. Interior pargement method not specified as refractory mortar per ASTM C 199. 86 95

4/12/2017 R Termination Section R Chimney Caps on masonry chimneys to be provided of sloped concrete, metal, or stone with drip edges and caulked bond breaks around flue liners per ASTM C 1283 Mandatory and required Section R Rain Caps of masonry or metal installed on masonry chimneys to allow net free area under caps of 4x net free area of chimney flue outlets served Not mandatory or required Section R Chimney Caps added to require chimney caps at termination of masonry chimneys. Chimney caps required to be of concrete, metal, or stone materials, properly sloped to shed water, installed with drip edges, and caulked with bond breaks around flue liners per ASTM C 1283. Chimney caps mandatory and required. Section R Rain Caps added to specify certain rain cap requirements at termination of masonry chimneys. Masonry or metal rain caps, where installed, required to provide net free area under caps of 4x net free area of chimney flue outlets served. Rain caps required to be installed prescribed distances above chimney flues to limit precipitation amounts entering flues, prohibit animals from entering or nesting in flues, and maintain proper air space for chimney drafts. Rain caps not mandatory or required. 96

Questions or Comments? Thank you
4/12/2017 Questions or Comments? At this time, we invite and welcome any comments or questions regarding the 2012 VRC training content. Thank you 97

Thanks and Credits to: Jack A. Proctor Virginia Building Code Academy Virginia Building Code Officials Association Roger Robertson, JAPVBCA Instructor Paula Eubank, Arlington County Chuck Vernon, Arlington County Chuck Bajnai, Chesterfield County Richard Moore, Henrico County Art Berkley, Isle of Wight Caleb Sulzen, Louisa County

2012 Virginia Residential Code Significant Code Changes

Similar presentations

Presentation on theme: "2012 Virginia Residential Code Significant Code Changes"— Presentation transcript:

Similar presentations

About project

Feedback

Log in

Auth with social network:

2012 Virginia Residential Code Significant Code Changes

Similar presentations

Presentation on theme: "2012 Virginia Residential Code Significant Code Changes"— Presentation transcript:

Similar presentations

About project

Feedback