Required Thickness Of Roof Sheathing

Roof sheathing materials plywood.

Required thickness of roof sheathing.

According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. If you re in search of quotes for a roof sheathing job improvenet can put you in touch with up to four local contractors for free. For the most common roof sheathing in our area which is 1 2 nominal 7 16 actual sheathing over trusses or rafters at 24 on center there is no requirement for h clips. Roof sheathing panel spacing hints.

Use a 10d box 0 128 inch by 3 inch nail as a spacer to gauge 1 8 inch edge and end spacing between panels. And for wood structural panel sheathing r803 2 2 allowable spans. Spacer type panel edge clips are available from some manufacturers. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Panel edges shall have approved tongue and groove joints or shall be supported with blocking unless 1 4 inch minimum thickness underlayment or 1 1 2 inches of approved cellular or lightweight concrete is placed over the subfloor or finish floor is 3 4 inch wood strip. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Sheathing type typically 15 32 inch or thicker panels are required in high wind areas. Use panels rated as exposure 1 or better.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the. The apa table has a span rating for the sheathing installed with or without h clips and the span rating is the same both ways. Many code requirements are not inspected.

And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. Never attach roof sheathing with staples. Comes in standard 4 by 8 foot sheets is strong. Sheathing should be a minimum of 19 32 inch thick.

Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance.