Minimum Pitch For Roof Sheeting

Never attach roof sheathing with staples.

Minimum pitch for roof sheeting.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Sheathing should be a minimum of 19 32 inch thick. The minimum plywood for roofing.

With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. 8d ring shank nails should be used instead. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The most common evil performed by so called roofers is the use of corrugated roofing all the manufacturers nominate a 5 degree minimum pitch for this profile whenever and wherever a metal. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. However you can only use this pitch with built up roofing or specialized synthetic roofing. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

The standard of lower pitch actually ranges between 1 12 to 5 12. Minimum pitch for metal roof. Asphalt shingles continue to be the most widely installed roof covering option in north america. The pitch of a roof is expressed in a ratio of rise over run creating a theoretical triangle with these numbers to illustrate the amount of slope.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. All the roof sheeting manufacturers nominate a minimum pitch that their various roof profiles are suitable for. Rafters run from the peak of the roof.

It will be in their product brochures. In fact the larger the first number becomes the steeper the slope. The metal roof minimum slope doesn t stray far from other building with different material. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The minimum pitch allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio.