Roof Sheathing Thickness Mn

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

Roof sheathing thickness mn.

8d ring shank nails should be used instead. The typical thickness range for sheathing is 3 8 to 3 4 inch. Sheathing should be a minimum of 19 32 inch thick. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.

If structural sheathing covers 40 percent or less of the exterior the continuous insulation r value is permitted to be reduced by no more than r 3 in the locations where structural sheathing is used to maintain a consistent total sheathing thickness. Never attach roof sheathing with staples. It will support roof. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.

Hand framed roofs must have a ridge board at least one inch nominal thickness and not less in depth than the cut end of the rafter. Underlayment shall be attached using metal or plastic cap nails with a head diameter of not less than 1 inch 25 4 mm with a thickness of at least 32 gauge sheet metal. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. The single valley or hip rafters must be at least two inches nominal thickness and at least the depth of the cut of the rafter.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Severe weather 23 32 cat ps1 09 square structural pressure treated southern yellow pine sheathing application as 4 x 8. For pricing and availability.

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. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load.