Required Thickness Of Roof Sheathing

You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness.

Required thickness of roof sheathing.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Many code requirements are not inspected. Loads will vary with the. Roof sheathing materials plywood.

Use panels rated as exposure 1 or better. And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. The typical thickness range for sheathing is 3 8 to 3 4 inch. And for wood structural panel sheathing r803 2 2 allowable spans.

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. Spacer type panel edge clips are available from some manufacturers. Roof sheathing panel spacing hints. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

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. 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. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. 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.

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. 8d ring shank nails should be used instead. Sheathing should be a minimum of 19 32 inch thick. 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.

Never attach roof sheathing with staples.