Minimum Sheathing Thickness Roof

Sheathing should be a minimum of 19 32 inch thick.

Minimum sheathing thickness roof.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Because 22 24 or 26 gauge sheeting is thicker and will therefore remain more structurally sound over a longer span than a 29 gauge the building needs fewer supports which saves your customers money. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins.

According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. Osb roof decking thickness 7 16 1 2 or 5 8 if were using osb we get 9 16 we dont worry about getting both 7 16 and 9 16 for walls then the roof we just get all of the same. And for wood structural panel sheathing r803 2 2 allowable spans.

Never attach roof sheathing with staples. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness. 1 inch 25 4 mm. Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Minimum roof sheathing thickness excerpt roof sheathing thickness rafter truss spacing 24 in. 8d ring shank nails should be used instead. Many code requirements are not inspected.

140 wind speed mph 150 mph 160 mph minimum sheathing thickness inches exposure b 7 16 24 16 15 32 32 16 19 32 40 20 minimum sheathing.