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.
Roof sheathing thickness requirements.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
Wood structural panel roof sheathing shall be bonded by exterior glue.
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 requirements underlayment roofing felt requirements under wood shingles shakes using a shingle course felt interlayment on wood roofs using.
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 panel spacing hints.
8d ring shank nails should be used instead.
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.
Note holes should not remove more than half of the sheathing section note.
If roof sheathing is cut and removed to achieve an air slot continuity and diaphragm action are affected.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
Spacer type panel edge clips are available from some manufacturers.
Minimum roof sheathing thickness excerpt roof sheathing thickness rafter truss spacing 24 in.
Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span.
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.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
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.