Minimum Sheathing Thickness Roof

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.

Minimum sheathing thickness roof.

And for wood structural panel sheathing r803 2 2 allowable spans. Many code requirements are not inspected. 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. Minimum roof sheathing thickness excerpt roof sheathing thickness rafter truss spacing 24 in.

Sheathing should be a minimum of 19 32 inch thick. 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. This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. 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. 8d ring shank nails should be used instead. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness. 1 inch 25 4 mm.

According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins. 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. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.