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Residential Requirements of the 2009 International Energy Conservation Code U.S. Department of Energy Building Energy Codes Program

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Presentation on theme: "Residential Requirements of the 2009 International Energy Conservation Code U.S. Department of Energy Building Energy Codes Program"— Presentation transcript:

1 Residential Requirements of the 2009 International Energy Conservation Code U.S. Department of Energy Building Energy Codes Program PNNL-SA-65859

2 Whats Changed Since IECC 2006? Stringency – some key differences New requirements Building envelope tightness Duct testing Lighting equipment Pool controls and covers Snow melt controls Moisture control requirements moved to IRC No mechanical trade-offs allowed

3 Climate Zones2009 IECC

4 Structure of the IECC Chapter 1Administrative Chapter 2Definitions Chapter 3Climate Zones Chapter 4Residential Energy Efficiency Chapter 5Commercial Energy Efficiency Chapter 6 Referenced Standards

5 Overview of Residential Code Requirements Focus is on building envelope Ceilings, walls, windows, floors, foundations Sets insulation levels, window U-factors and solar heat gain coefficients Infiltration control - caulk and seal to prevent air leaks Ducts – seal and insulate Limited space heating, air conditioning, and water heating requirements Federal law sets most equipment efficiency requirements, not the I-codes No appliance requirements Lighting equipment – 50% of lamps to be high- efficacy lamps

6 Additions, Alterations, Renovations, Repairs Conform as relates to new construction Unaltered portions(s) do not need to comply Additions can comply alone or in combination with existing building Exceptions Storm windows over existing fenestration Glass only replacements Exposed, existing ceiling, wall or floor cavities if already filled with insulation Where existing roof, wall or floor cavity isnt exposed Reroofing for roofs where neither sheathing nor insulation exposed Insulate above or below the sheathing Roofs without insulation in the cavity Sheathing or insulation is exposed

7 Additions Treat as a stand-alone building Additions must meet the prescriptive requirements in Table N

8 Additions, Alterations, Renovations, Repairs Roof Replacement Where the roof of an existing building is being replaced and the roof is a component of the thermal envelope of a building being regulated by the code, and the R- Value of the existing roof insulation is less than 30, insulation shall be added to achieve R-30. (CABQ Code based on 2006 IECC) 2009 IECC - None, for new building R-38 NM 2009 Energy Code - None, for new building R-38 ASHRAE None, for new building R-49

9 U-Factor and UA Alternatives Simulated Performance (software) Prescriptive R-values Simulated Performance Alternative 405 U-factor Total Building UA IECC Compliance - Three Options

10 Code Compliance Alternate Method Above-code programs. One and two-family dwellings and townhomes designed to obtain LEED Silver or Build Green New Mexico Silver certification are deemed to meet the greenhouse gas reduction codes of the City of Albuquerque and to be in compliance with this code 2009 IECC – Above-code programs authorized in Section

11 INDEPENDENT THIRD PARTY INSPECTIONS AND TESTS Requires inspections and tests under direct supervision of a RESNET Certified Home Energy Rater Thermal Bypass Inspection Duct Leakage Tests Building Envelope Leakage Test 2009 IECC – Certificate of Inspection Thermal Bypass Test or Inspection NM 2009 Energy Code Certificate of Inspection, Thermal Bypass Inspection

12 Climate-Specific Requirements Climate-Specific Requirements: Foundations Basements Slabs Crawlspaces Above grade walls Skylights, windows, and doors Roofs Solar Heat Gain Coefficient in warm climates Universal Requirements (apply everywhere): Duct insulation and sealing Infiltration control Including recessed cans

13 Insulation and Fenestration Requirements by Climate Zone Table Insulation and Fenestration Requirements by Component a a. R-values are minimums, U-factors and SHGC are maximums, R-19 batts compressed into a nominal 2 x 6 framing cavity such that the R-value is reduced by R-1 or more shall be marked with the compressed batt R-value in addition to the full thickness R-value. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. c. 15/19 means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. 15/19 shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. 10/13 means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. d. R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs. e. There are no SHGC requirements in the Marine Zone. f. Basement wall insulation is not required in warm-humid locations as defined by Figure and Table g. Or insulation sufficient to fill the framing cavity, R-19 minimum. h means R-13 cavity insulation plus R-5 insulated sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2. i. The second R-value applies when more than half the insulation is on the interior of the mass wall. j. For impact rated fenestration complying with Section R of the IRC or Section of the IBC, maximum U-factor shall be 0.75 in Zone 2 and 0.65 in Zone 3.

14 BUILDING THERMAL ENVELOPE Table Climate Zone 4B North-East-West facing glazing CABQ Code = Low-E glass required 2009 IECC U=0.35 SHGC=NR NM 2009 Energy Code U=0.35 SHGC=0.35 ASHRAE U=0.45 SHGC=0.40 (metal frame) Wood Frame Wall R-Value CABQ Code R=21 or R=13 cavity + R=7.5 sheathing 2009 IECC R=20 or R=13 cavity + R=5 sheathing NM 2009 Energy Code R=20 or R=13 cavity + R=5 sheathing ASHRAE U=0.051or R=13 cavity + R=7.5 sheathing

15 U-Factor Requirements by Climate Zone Table Equivalent U-Factors a a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source. b. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.17 in Zone 1, 0.14 in Zone 2, 0.12 in Zone 3, 0.10 in Zone 4 except Marine, and the same as the frame wall U-factor in Marine Zone 4 and Zones 5 through 8. c. Basement wall U-factor of in warm-humid locations as defined by Figure and Table

16 BUILDING THERMAL ENVELOPE Table Equivalent U-Factors Climate Zone 4B Wall Frame U-Factor CABQ Code U= IECC U=0.051 NM 2009 Energy Code R-values only ASHRAE U=0.51 Floor U-Factor CABQ Code U=0.046 frame 2009 IECC U=0.047 frame NM 2009 Energy Code R-values only ASHRAE U=0.62 mass U=0.26 wood frame

17 Mandatory Requirements Building Envelope Air leakage Recessed lighting Maximum fenestration U-factor and SHGC Fireplaces

18 Air Leakage Control Building envelope Sealed with caulking materials or Closed with gasketing systems Joints and seams sealed or taped or covered with a moisture vapor-permeable wrapping material Mandatory Requirements

19 Areas for Air Leakage (Infiltration) Windows and doors Between sole plates Floors and exterior wall panels Plumbing Electrical Service access doors or hatches Recessed light fixtures Rim joist junction

20 Air Sealing and Insulation 2 options to demonstrate compliance When tested air leakage is <7 ACH when tested with a blower door at pressure of 33.5 psf (Section ) Testing after rough in and installation of building envelope penetrations When items listed in Table , applicable to the method of construction, are field verified (Section )

21 Mechanical Systems & Equipment Equipment efficiency set by Federal law, not the I-Codes

22 Mandatory Requirements Systems (Section 403) Controls Heat pump supplementary heat Ducts Sealing (Mandatory) Insulation (Prescriptive) HVAC piping insulation Circulating hot water systems Ventilation Equipment sizing Systems serving multiple dwelling units Snow melt controls Pools

23 Programmable Thermostat - Controls If primary heating system is a forced-air furnace At least one programmable thermostat/dwelling unit Capability to set back or temporarily operate the system to maintain zone temperatures down to 55ºF (13ºC) or up to 85ºF (29ºC) Initially programmed with: heating temperature set point no higher than 70ºF (21ºC) and cooling temperature set point no lower than 78ºF (26ºC) Mandatory Requirements

24 Ducts Insulation (Prescriptive) Ducts outside the building envelope: R-8 All other ducts: R-6 Sealing (Mandatory) Joints and seams shall comply with IRC, Section M Building framing cavities shall not be used as supply ducts

25 Duct Insulation Requirements CABQ Code Exception: Ducts or portions thereof located completely inside the building thermal envelope 2009 IECC Exception: Ducts or portions thereof located completely inside the building thermal envelope NM 2009 Energy Code – Detailed specifications on location and R-value, even indirectly conditioned spaces (i.e. inside the building thermal envelope) required R = 3.5 ASHRAE – Table C-10 detailed specifications on location and R-value either R=8 or R=6), the indirectly conditioned spaces require no insulation

26 Duct Tightness Tests All ducts, air handlers, filter boxes and building cavities used as ducts shall be sealed (Section ) Duct tightness shall be verified by either Post construction test Leakage to outdoors: 8 cfm/per 100 ft 2 of conditioned floor area or Total leakage: 12 cfm/per 100 ft 2 of conditioned floor area tested at a pressure differential of 0.1 in w.g. (25Pa) across entire system, including manufacturers air handler enclosure All register boots taped or otherwise sealed Rough-in test Total leakage 6 cfm/per 100 ft 2 of conditioned floor area tested at a pressure differential of 0.1 in w.g. (25Pa) across roughed-in system, including manufacturers air handler enclosure all register boots taped or otherwise sealed if air handler not installed at time of test Total air leakage 4 cfm/per 100 ft 2 Exceptions: Duct tightness test is not required if the air handler and all ducts are located within conditioned space Mandatory Requirements OR

27 Piping Insulation R-3 required on HVAC systems Exception: Piping that conveys fluids between 55 and 105°F CABQ Code R=4 pipe 2 or less, R=6 piping > IECC R=3 NM 2009 Energy Code R=2 ASHRAE R=5 or greater depending on pipe diameter and temperature Mandatory Requirements

28 Ventilation and Equipment Sizing Ventilation Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating Equipment Sizing IECC references Section M of the IRC Load calculations determine the proper capacity (size) of equipment Goal is big enough to ensure comfort but no bigger Calculations shall be performed in accordance with ACCA Manual J or other approved methods Mandatory Requirements

29 Fan Power Limitation CABQ Code Table Fan Performance Energy Star Label required 2009 IECC = Table Fan Power Limitation NM 2009 Energy Code - meet Energy Star requirements ASHRAE % below ASHRAE 90.1 Requirements

30 Roof Material Requirements 402,8 Roof Reflectance Reflective roof coverings that are Energy Star qualified Low slope roof – solar reflectance of 0.65 Steep slope roof – solar reflectance of 0.25 Exception, approved green roofs. (CABQ Code) 2009 IECC = Specifies roof absorptance value 0.75 NM 2009 Energy Code - not addressed ASHRAE Solar Reflective Index requirements Reflective roof coverings that are Energy Star qualified Low slope roof – SRI = 78 Steep slope roof – SRI = 29

31 Lighting Equipment (Prescriptive) A minimum of 50 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps NM 2009 Energy Code also requires motion sensor, daylight sensor and/or timer shall be installed on at least 33% of the outdoor fiuxtures

32 Simulated Performance Alternative Requires computer software with specified capabilities (local official may approve other tools) Includes both envelope and equipment Allows greatest flexibility. Credits features such as: High efficiency furnaces, air-conditioners, etc. Tight ducts (must be leak tested) or hydronic systems Exterior shading, favorable orientation, thermal mass, SHGC, etc. Section 405 specifies ground rules These will generally be hidden in compliance software calculation algorithms Very similar ground rules are used in home federal tax credits and ENERGY STAR Home guidelines


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