Minimum Roof Slope Foam

For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.

Minimum roof slope foam.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. 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. 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. Roofing material or system. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction.

Asphalt shingles continue to be the most widely installed roof covering option in north america. In 12 0 25 in 12 1 19 built up roof coal tar pitch. The metal roof minimum slope doesn t stray far from other building with different material. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.