Roof Sheathing Thickness Mn

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.

Roof sheathing thickness mn.

The typical thickness range for sheathing is 3 8 to 3 4 inch. It will support roof. 15 32 cat ps1 09 square structural douglas fir sheathing application as 4 x 8. The cap nail shank shall be a minimum of 12 gauge 0 105 inches with a length to penetrate through the roof sheathing or a minimum of 3 4 inch 19 mm into the roof sheathing.

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. Severe weather 23 32 cat ps1 09 square structural pressure treated southern yellow pine sheathing application as 4 x 8. Never attach roof sheathing with staples. 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.

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. 8d ring shank nails should be used instead. Sheathing should be a minimum of 19 32 inch thick. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

A single valley or hip rafter must be located at all valleys and hips. 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 most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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.