Pitched Roof Extension Minimum Angle

The requirements for an asphalt shingles roof are contained in the international building code.

Pitched roof extension minimum angle. Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15. Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages. Asphalt shingles continue to be the most widely installed roof covering option in north america.

It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

Building a pitched roof kitchen extension is as simple as building any other pitched roof extension.