Minimum Slope For Epdm Roof

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.

Minimum slope for epdm roof.

Roof ceiling joists nailed to the house. Pvc membrane assemblies generally have higher maximum roof slope limitations. 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. Perlite board is not acceptable due to its relative dusty surface and low peel resistance.

The 12 year weatherbond warranty is to date the best i ve found in the category of residential low slope roofing products. The idea is to provide positive drainage toward roof drains so there is no ponding water 48 hours after a rain storm. The roof surface will be made clean dry smooth and free of contaminants such as grease animal fats coal tar and oil based products. The rear room addition flat roof was blue tarped.

And if the performance of single ply epdm roofing on commercial installations is any measure weatherbond 110 can certainly last much longer than 12 years if it s properly installed. Roof slope should be a minimum of 2 to allow for adequate drainage of the roof taking into account the deflection of the roof. For example some epdm membrane assemblies have maximum roof slope limitations as low as 1 2 12. Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. About 1 slope if that in 12. Some tpo membrane assemblies also have relatively low maximum roof slope limitations. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america.