Minimum Pitch For Epdm Roof

For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.

Minimum pitch for epdm roof.

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. 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 pitch is also subject to the standards set forth by the various building codes used in the respective regions. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.

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. 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. Asphalt shingles continue to be the most widely installed roof covering option in north america. The pitch angle of your roof will determine what type and design of tile can be installed.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Ballasted systems are limited to a maximum slope of 2 inches per foot 2 percent. Coal tar pitch type i asphalt asphalt mastic or a resaturant. Importance of a roof pitch.

This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction. Technically we are talking about low slope roofs that have a slope less than or equal to 3 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. You can read our article about calculating slope for information on the various roof slope notations.

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. 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. 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 could also opt for a pvc flat roofing membrane.

Fleece backed epdm has been used as a separator when the substrate consists of an old bituminous roof containing soft bitumen e g. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.