Minimum Roof Slope Foam

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Minimum roof slope foam.

Asphalt shingles continue to be the most widely installed roof covering option in north america. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Re roofing usually entails different slope requirements. Built up roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage except for coal tar built up roofs that shall have a design slope of not less than one eighth unit vertical in 12 units horizontal 1 percent slope.

9 46 built up roof asphalt. Sprayed polyurethane foam roofs must have a design roof slope of 1 4 12 or greater 2 slope. Minimum required roof slope for roofing materials. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.

The standard of lower pitch actually ranges between 1 12 to 5 12. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

Roofing material or system. The metal roof minimum slope doesn t stray far from other building with different material.