1. Wood Structures Topic 8 Quality Workmanship
Inspections
Quality Workmanship
BLDG 1101
9/21/2018
BLDG jn/2012

2. Introduction
This topic is an example of a self inspection for builders in constructing wood frame houses and supervising trades.
This session deals with a construction checklist, not only for building code inspections, but mainly for quality control of good workmanship striving for excellence and highest levels of quality.
BLDG 1101
9/21/2018

3. BLDG 1101
9/21/2018

4. Wood Structures Topic 8
Introduction
Quality housing is the responsibility of everyone involved in the process.
An emphasis on quality related procedures and products, at all levels, is particularly important in China where wood platform frame construction is a new building system.
BLDG 1101
9/21/2018
BLDG jn/2012

5. Inspections/ quality workmanship
Quality of housing, and products used in housing, is required for the future success of wood platform housing in China.
Houses should be designed and constructed so that occupants can be assured of : health, fire safety, live safety, structural sufficiency, and protection of persons and property.
BLDG 1101
9/21/2018

6. Wall Framing Inspections
Walls carry vertical loads and transfer roof and floor loads to the house foundation.
Structural integrity is the paramount safety issue in wall framing. Particularly in zones with high winds and seismic activity.
Durability is also an important consideration.
BLDG 1101
9/21/2018

7. Wall Framing Inspections
The overall performance of the wall system depends on a number of factors including the design and location of walls within the floor plan; the size and location of openings; sizes, species, grades and spacing of structural members; type and thickness of sheathing; and the degree to which the structural members along with sheathing are fastened together.
Walls must be well connected to floor and roof assemblies.
BLDG 1101
9/21/2018

8. Wall Framing Inspections
Wall Framing Inspection Check-Lists.
See handouts re wall framing Inspection list.
BLDG 1101
9/21/2018

9. Quality Control Review and Inspection for wall framing
Check the following items to see if they are ok.
Site condition
Product storage and protection
Lumber and panels
Engineered wood products
Building access
On site safety
Ladders and scaffolding
Appropriate safety measures
BLDG 1101
9/21/2018

10. Quality Control cont. Framing generally level, plumb and square Studs
Precision of location
Bearing of sheathing
Perpendicular to sheathing at width
Security framing at entrances and doorways
BLDG 1101
9/21/2018

11. Quality Control cont. Stud/column support Around large openings
All point loads
Follow through structure to foundation
Additional blocking in floors
End bearing
Lintels
Beams (concentrated loads)
BLDG 1101
9/21/2018

12. Quality Control cont. Window and door openings
Dimensions for window and door installation
Horizontal alignment of lintels and window sills
Vertical alignment of centering (successive floors)
Security blocking (or not required)
Backing for interior finishes (e.g., drywall)
Separation of framing members from concrete and masonry
Wall bracing
Fasteners and connectors with required level of corrosion resistance when used with chemically preserved wood
BLDG 1101
9/21/2018

13. Quality Control cont. Protection against termites
Use of pressure treated wood
Use of other measures
Full and proper preservative treatment of members/panels according to risk of termite attack and damage
All members and panels (all walls)
Some members and panels
No preservative treatment
Meets local requirements and/or specifications
BLDG 1101
9/21/2018

14. Inspectors Notes/Seismic Risk
It should be noted because of the severe seismic risk in many parts of China that particular attention ought to be paid to code requirements regarding the structural integrity of the wood frame structure, when subject to earthquakes.
This includes, braced wall, adequate nailing throughout but particularly for braced wall sheathing panels, and full connections.
Specifically designed shear walls or hold down devices may also be required in the plans.
BLDG 1101
9/21/2018

15. Inspectors Notes/Concentrated (Point) Loads
Quality control inspectors must ensure that the wood platform frame structure enables the transfer of all point loads from the point of concentrated load origin to the foundation.
This means sufficient end bearing and column support as well as continuity of support to transfer and carry these loads down to the foundation and bearing soil.
BLDG 1101
9/21/2018

16. Inspectors Notes/Concentrated (Point) Loads
It is important to follow bearing support of lintels, beams, girder trusses, etc, through the entire framed structure to rest directly on the foundation.
Point loads generally require expanding the size of the studs (built-up posts or columns) under the load and blocking in the floor.
Extreme point loads may require local widening and thickening of the footing.
BLDG 1101
9/21/2018

17. Point Load Inspection Procedure
Begin at the top and follow each individual concentrated load all the way through the building to the foundation.
Some concentrated loads
Loads traced from origin, down through entire structure
Loads carried in walls with built-up studs or columns at concentrations
Loads from above carried in floors through additional joists or blocking
Loads bear directly on foundation
BLDG 1101
9/21/2018

18. Point Load Inspection Procedure
Column (could be jack studs)size must be adequate to support concentrated loads from headers and beams through the walls and floors to the foundation.
As a general rule, the column should be of sufficient cross sectional dimensions to support the width of the beam and the minimum end bearing distance specified by codes.
BLDG 1101
9/21/2018

19. Point Load Inspection Procedure
For large concentrated loads, the magnitude of the loads and supporting post requirements should be set out in the permit drawings.
In the case of high ceilings, requirements for lateral support should also be specified.
You should ensure that all requirements for post dimensions and continuity to foundation, lateral support (including nailing of wall sheathing to post/column) and connections are met.
BLDG 1101
9/21/2018

20. Point Load Inspection
If point loads are not accommodated then structures, can settle or deform leading to numerous complications with windows, doors, and interior and exterior finishes.
At the extreme, there is risk of structural failure.
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31. Common Code Violations
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