RESIDENTIAL BULDING - SHEATHING

Special Note: Advise the job Supervisor that flashings and weep holes are required in all masonry walls, at foundations, over doors and windows, and as a protection for attached wood trim and decks.

• Determine from the grade mark if the span rating and joists spacing are adequate.
• Determine if the panels are continuous over two or more spans and if the long dimension is perpendicular to the supports.
• Determine if the unsupported edges have tongue and groove joints OR blocking with lumber UNLESS a ¼-inch underlayment is installed OR a ¾-inch wood finish floor is used.
• If the panel is ¾ inch thick or less, then determine if 6d deformed nails or 8d common nails are spaced 6 inches on center at edges and 12 inches on center at intermediate supports.

Roof Sheathing Inspections

• Determine from the grade mark on the wood structural panel that it is an exterior type of sheathing and the span rating and joists spacing are adequate.
• Determine if the panels are continuous over two or more spans.
• Determine if the panel long dimension is perpendicular to the supports.
• Determine if the panel edges are supported with solid blocking or an approved edge support (panel clips).
• Check for grade mark and proper installation of fire-retardant-treated plywood, taking strength reduction factors into consideration.
• If the panel is 5/16 inch to ½ inch thick, then determine if 8d common nails spaced 6 inches on center at the edges, and 12 inches on center at the intermediate supports are in place.

Wall Sheathing Inspections

Special Note: Advise the job Supervisor that flashings and weep holes are required in all masonry walls, at foundations, over doors and windows, and as a protection for attached wood trim and decks.

• Determine from the grade mark if the particle board or plywood is designated for use as wall sheathing on the exterior.
• Determine that the maximum stud spacing is 16 inches for particle board and complies with the grade mark for plywood.
• Determine if all panel edges are supported.
• Determine if the particle board wall sheathing has 1/16-inch expansion gaps between each adjoining panel edge.
• Determine if 6d common nails spaced 6 inches on center at the edges and 12 inches on center at the intermediate supports are in place.
• If the panels are to be used for wall bracing, then determine if the type, locations, and amount of bracing is per Section R-602 of the IRC Code.
• When using structural thermo-ply or equivalent sheathing on exterior walls, ensure that spacing, nailing, and edge blocking comply with the manufacturers instructions.

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