Minimum Slope Roll Roofing

Residential low slope roofing can generally be divided up into two broad categories.

Minimum slope roll roofing.

Functional pitch the function of the roof in weather and the environment determines the minimum pitch for a roof. 3 12 minimum roof slope for metal roof panels with nonsoldered seams. Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

Mineral surfaced roll roofing can only be installed on roof slopes of 1 12 or greater 8 slope. Asphalt shingles continue to be the most widely installed roof covering option in north america. One msr roofing roll is usually about 36 feet long by 36 inches wide. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing.

Cap sheets can be smooth or granular. This is a single layer membrane style roofing material that is heat activated by a torch during installation. Slate shingles minimum roof slope roof pitch r905 6 2. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv.

Square is a roofing term that refers to one roofing unit of 100 square feet. So in terms of quantity a roofing roll is about the size of one composite shingle square. Mineral surfaced roll roofing minimum roof slope roof pitch r905 5 2. This means for every 12 horizontal units the roof must rise a minimum of 1 vertical unit.

Finding the right products for your low slope roof. Roofing systems have various components like. Rolled roofing is easy to obtain and can be found at all home improvement stores. Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in. 2 1 2 12 minimum roof slope for clay and concrete tile. I think of roll roofing as anything that is a building paper or felt asphalt impregnated some is solid and some is perforated to help absorb asphalt.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Nailable base sheet layers of felt cap etc. Sometimes called tar and gravel or bur the modern form of this kind of roof consists of alternating layers of bitumen and reinforcing fabrics.