Minimum Slope For Single Ply Membrane Roofing

The resisto single ply roofing system is guaranteed for 15 years against any manufacturing defect that may cause leaks.

Minimum slope for single ply membrane roofing.

The minimum slope for a flat roof is 1 4 per foot or 1 4 12 but some owners or insurance companies require a minimum slope of 1 2 per foot. Roofing membranes that are single ply such as a pvc tpo or epdm requires a thin layer of a compatible single ply adhesive to be used as a primer for roofslope. Unique in the industry duro last offers a 15 year warranty with consequential damage coverage for duro last prefabricated roofing systems with no additional charge. These membranes are particularly effective for roofs with a very low slope between 1 8 12 1 and 4 12 33.

Apply a single ply adhesive that will adhere to the existing membrane as a primer thick enough to accept a full broadcast of 16 grit silica sand or granules. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof. The idea is to provide positive drainage toward roof drains so there is no ponding water 48 hours after a rain storm. Table 1 01 1 chart of roofing system applicability thermoplastic single ply membranes back nailing table 1 03 1 back nailing requirement for sloped roofs table 1 04 1 the minimum fastener pullout resistances for specific systems.

Astm d4637 standard specification for epdm sheet used in single ply roof membrane. Short for thermoplastic polyolefin tpo is a single ply roofing membrane that offers excellent performance at a cost effective price. The slope of the roof must not be less than 1 12 8. Heat welded seams provide superior strength.

A minimum slope of 0 25 inches per foot 2 percent is recommended for all low slope roofing systems for adhered systems the substrate must be one that is approved by the system supplier. The use of the resisto self adhered waterproofing membrane as a first layer and the resisto granulated cap sheet high resistance hr cap sheet as a second layer is an ideal solution to ensure the waterproofing of low slope roofs. Higher density products provide improved impact resistance. Thermoplastic single ply membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope.

Sprayed polyurethane foam roofing. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. For example the international building code 2018 edition ibc 2018 prescribes a 1 4 12 minimum roof slope for asphalt built up polymer modified bitumen thermoset and thermoplastic single ply and liquid applied membranes in new construction. Single ply membrane has a weft insertion anti wicking scrim with a density of 18 by 14 threads per inch among the highest in the industry.