Minimum Slope Of 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.

Minimum slope of epdm roof.

A minimum pitch of 3 in 12 or even 4 in 12 will normally be required. Asphalt shingles continue to be the most widely installed roof covering option in north america. Minimum pitch for metal roof. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

The rear room addition flat roof was blue tarped. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.

The minimum roof slope for metal roofs is dependent upon the roof profile. The total cost for that 2 000 square foot epdm roof will run between 10 000 and 13 000. Roof ceiling joists nailed to the house. About 1 slope if that in 12.

Asphalt shingles minimum roof slope roof pitch r905 2 2. 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. For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.

Asphalt shingles can only be installed on roof slopes of 2 12 or greater. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. 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. I opened the roof and added new rafters from the outer wall to the higher up top plate of the house like its supposed.

Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low slope or nearly flat roofs. The roofer was not calling back and i had to determine with your input a proper pitch for the new epdm. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The idea is to provide positive drainage toward roof drains so there is no ponding water 48 hours after a rain storm.