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.

Minimum pitch for roof sheeting.

Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum pitch allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.

Rafters run from the peak of the roof. 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. All the roof sheeting manufacturers nominate a minimum pitch that their various roof profiles are suitable for. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

The standard of lower pitch actually ranges between 1 12 to 5 12. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Minimum pitch for metal roof.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Sheathing should be a minimum of 19 32 inch thick. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch.

The metal roof minimum slope doesn t stray far from other building with different material. In fact the larger the first number becomes the steeper the slope. The minimum pitch for metal roofing varies depending on the profile of the metal. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

However you can only use this pitch with built up roofing or specialized synthetic roofing. It will be in their product brochures. Never attach roof sheathing with staples. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The minimum roof slope for metal roofs is dependent upon the roof profile. 8d ring shank nails should be used instead.