Roof Sheathing Thickness Requirements

Roof sheathing panel spacing hints.

Roof sheathing thickness requirements.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Wood structural panel roof sheathing shall be bonded by exterior glue. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Note holes should not remove more than half of the sheathing section note.

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. 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. Spacer type panel edge clips are available from some manufacturers. 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.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. If roof sheathing is cut and removed to achieve an air slot continuity and diaphragm action are affected. 8d ring shank nails should be used instead. Minimum roof sheathing thickness excerpt roof sheathing thickness rafter truss spacing 24 in.

Roof sheathing requirements underlayment roofing felt requirements under wood shingles shakes using a shingle course felt interlayment on wood roofs using. Never attach roof sheathing with staples. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span.