Minimum Slope For Single Ply Membrane Roofing

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.

Minimum slope for single ply membrane roofing.

This warranty applies to low slope roofs that use the outer perimeter instead of a drain to evacuate water. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. Higher density products provide improved impact resistance. These membranes are particularly effective for roofs with a very low slope between 1 8 12 1 and 4 12 33.

The slope of the roof must not be less than 1 12 8. 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. 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. 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.

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. Heat welded seams provide superior strength. 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.

Thermoplastic single ply membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope. Short for thermoplastic polyolefin tpo is a single ply roofing membrane that offers excellent performance at a cost effective price. The idea is to provide positive drainage toward roof drains so there is no ponding water 48 hours after a rain storm. Tpo s long term heat uv and natural fungal resistance plus flexibility without need for plasticizers also make tpo a reliable low slope roofing system.

Thermoplastic single ply roofing minimum roof slope roof pitch r905 13 1. 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. Sprayed polyurethane foam roofing.