Minimum Pitch For Epdm Roof

Coal tar pitch type i asphalt asphalt mastic or a resaturant.

Minimum pitch for epdm roof.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Fleece backed epdm has been used as a separator when the substrate consists of an old bituminous roof containing soft bitumen e g. 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. 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. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.

You could also opt for a pvc flat roofing membrane. The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof. 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 12 year weatherbond warranty is to date the best i ve found in the category of residential low slope roofing products.

For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. The pitch angle of your roof will determine what type and design of tile can be installed. Ballasted systems are limited to a maximum slope of 2 inches per foot 2 percent. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction.

For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope. Importance of a roof pitch. Asphalt shingles continue to be the most widely installed roof covering option in north america. Some modern interlocking roof tiles will accomodate a pitch angle as low as 15 degrees where as more traditional rosemary or victoria tiles require a 35 degree pitch minimum.

You can read our article about calculating slope for information on the various roof slope notations. The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.