Required Thickness Of Roof Sheathing

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Required thickness of roof sheathing.

Loads will vary with the. And for wood structural panel sheathing r803 2 2 allowable spans. Building codes for roofing reqiure a minimum 1x4 and the spaces between battens should not exceed 3 1 2 inches figure 2 46 wood shingles over spaced sheathing and figure 2 47 wood shakes installed over wood sheathing are illustrated below. Spacer type panel edge clips are available from some manufacturers.

Use panels rated as exposure 1 or better. 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. 8d ring shank nails should be used instead. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

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. Roof sheathing materials plywood. Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance. Sheathing type typically 15 32 inch or thicker panels are required in high wind areas.

The typical thickness range for sheathing is 3 8 to 3 4 inch. 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. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity.

Many code requirements are not inspected. Roof sheathing panel spacing hints. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness.

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.