Roof Sheathing Thickness Requirements

When you replace a roof on a home that was built before the implementation of the statewide florida building code on march 1 2002 the nailing of the roof sheathing decking must be brought up to current standards for hurricane resistance as part of the installation of the new roof. Sheathing should be a minimum of 19 32 inch thick. Note holes should not remove more than half of the sheathing section note.

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Roof sheathing conforming to the provisions of table 2304 7 1 2304 7 2 2304 7 3 or 2304 7 5 shall be deemed to meet the requirements of this section.

Roof sheathing thickness requirements.

Nails from sheathing to ridge board roof sheathing ridge board ridge board joist or truss joist or truss roof sheathing vent holes on each side of ridge board. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. Spacer type panel edge clips are available from some manufacturers. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

Roof sheathing panel spacing hints. 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 thickness inches panel span rating exposure c 19 32from asce 7 40 20 19 32 40 20 19 32 40 20. 8d ring shank nails should be used instead. Roof sheathing requirements underlayment roofing felt requirements under wood shingles shakes using a shingle course felt interlayment on wood roofs using.

Wood structural panel roof sheathing shall be bonded by exterior glue. If roof sheathing is cut and removed to achieve an air slot continuity and diaphragm action are affected. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Secure roof sheathing panels to the roof framing with 8d common nails spaced six inches on center at the edges and twelve inches on center at intermediate supports.

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. The typical thickness range for sheathing is 3 8 to 3 4 inch. This article discusses the requirements specifications for roof sheathing nailers or plywood or osb and underlayment roofing felt for wood shingle wood shake roofs including roof decking needed under wood shingles shakes. 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. Never attach roof sheathing with staples.

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