Minimum Slope For Epdm Roof

For example some epdm membrane assemblies have maximum roof slope limitations as low as 1 2 12.

Minimum slope for epdm roof.

The 12 year weatherbond warranty is to date the best i ve found in the category of residential low slope roofing products. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

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. Asphalt shingles continue to be the most widely installed roof covering option in north america. Higher density products provide improved impact resistance. The roofer was not calling back and i had to determine with your input a proper pitch for the new epdm.

Some tpo membrane assemblies also have relatively low maximum roof slope limitations. Roof ceiling joists nailed to the house. 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 following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Pvc membrane assemblies generally have higher maximum roof slope limitations. Roof slope should be a minimum of 2 to allow for adequate drainage of the roof taking into account the deflection of the roof. About 1 slope if that in 12. The rear room addition flat roof was blue tarped.

I opened the roof and added new rafters from the outer wall to the higher up top plate of the house like its supposed. 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.