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Masonry

 

Structural Steel and

 

High Strength Bolting

 

Nondestructive Testing

 

Spray-Applied Fireproofing

 

Glu Lam and Truss Joists

 

Shear Walls and Floor Systems Used as Shear Diaphragms

SECTION 14 - SHEAR WALLS AND FLOOR SYSTEMS USED AS SHEAR DIAPHRAGMS

OBJECTIVE

Many public agencies are now requiring special inspection during the construction of plywood shear walls and floor systems used as shear diaphragms. These are critically important elements to the structural integrity of the building, and are therefore considered appropriate for special inspection.

This objective can best be achieved by qualified special inspectors performing the following duties under the direct supervision of the materials engineering laboratory.

OBSERVATION DUTIES

A. Documents

1. Review the approved plans, specifications, and other appropriate project documents.
2. Review applicable sections of referenced codes and standards, particularly the Timber Construction Manual by the American Institute of Timber Construction (AITC) and the Uniform Building Code by ICBO.

B. Materials

1. Verify material grades.
2. Verify nail type and size.
3. Verify connector, including tiedowns, framing clips, bolts, and straps.

C. Sampling of Materials

1. Sample and deliver to the laboratory for testing the following materials when required by project specifications:
   1. Structural panel sheathing (i.e. plywood, gypsum, fiberboard or particle board)
   2. Framing lumber
   3. Fasteners including nails, screws, bolts, etc.

D. Observation Procedures

1. Check nail spacing, penetration, edge distance, and verify nail size.
2. Check for proper plywood thickness and grade.
3. Check for installation of blocking, when blocked edges are required.
4. Check the receiving members for spacing, size, and resistance to splitting.
5. Check for proper plywood layout per project requirements.
6. Check for "shiners" (nails penetrating structural panel sheathing only)
7. Verify that critical members have received the nail specified.

E. Reports

1. Submit written progress reports describing the tests and observations made and showing the action taken to correct nonconforming work. Itemize any changes authorized by architect/engineer. Report all uncorrected deviations from plans or specifications.

 

 

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