Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
Florida roof sheathing thickness.
For closed valleys valley lining of one ply of smooth roll roofing complying with astm d 6380 classsand atleast36 inches 914 mm wide or valley lining as described in item 1 or 2 above shall be permitted.
This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load.
Sheathing should be a minimum of 19 32 inch thick.
The bottom layer shall be 18 inches 457 mm and the top layer a minimum of 36 inches 914 mm wide.
Allowable spans for lumber floor and roof sheathing a b for si.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
1 inch 25 4 mm.
Where the roof sheathing is less than 3 4 inch 19 1 mm thick the nails shall penetrate through the sheathing.
That s considered to be the minimum.
Minimum thickness of the outside edge of plastic caps shall be 0 035 inch.
Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.
The cap nail shank shall be not less than 0 083 inch for ring shank cap nails and 0 091 inch for smooth shank cap nails.
While ring shank nails are still required the nail size depends on the sheathing thickness.
Fasteners for asphalt shingles shall be galvanized stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 2 67 mm shank with a minimum 3 8 inch diameter 9 5 mm head of a length to penetrate through the roofing materials and a minimum of 3 4 inch 19 1 mm into the roof sheathing.
Never attach roof sheathing with staples.
If it was originally secured using staples or 6d nails it must be completely re nailed to the new standard.
Fasteners shall comply with astm f1667.
Cap nail shank shall have a length sufficient to penetrate through the roof sheathing or not less than 3 4 inch into the roof sheathing.
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.
The requirement became effective on october 1 2007.
Specifies the minimum sheathing thickness for framing spaced 24 inches on center based on exposure category and wind speed.
Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.
