Maximum Roof Pitch For Asphalt Shingles

All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

Maximum roof pitch for asphalt shingles. If a roof slope exceeds this limitation the shingles should be applied by the following recommended method complying with astm d4586. 9 46 built up roof asphalt. The minimum slope for an asphalt shingle roof is 2 12. Wood and slate shingles are used in many of the same types of roofs as asphalt composite shingles but may not be appropriate for roofs near the lower end since they are more susceptible to leaking.

Secure the shingle to the roof deck with fasteners as recommended by the roofing manufacturer. Asphalt felt paper that is tacked to the roof sheathing. Minimum required roof slope for roofing materials. Shingles can be fabricated from a wide range of materials such as asphalt least expensive to natural wood metal tiles and heavy slate most expensive.

Shingles of all types need to have a slope to function properly. For example if it is a very low slope water including snowmelt or. Fortunately the requirements are quite accommodating. What is the minimum pitch slope of an asphalt shingle roof.

Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum requirement is 2 12. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. There are plenty of other options however for flat and nearly. Why is 2 12 the minimum. The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12.

Pitched roofs are most often associated with asphalt shingles although standing seam roofs are becoming ever more popular on pitched roofs as well. The maximum slope considered suitable for normal shingle application is 45 degrees or 12 per foot. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Considering the roof slope requirement is important.

Roofing material or system. 18 43 asphalt shingles with special underlayment requirements 2 in 12. For asphalt shingle clay and concrete tile metal shingle slate and wood shake and shingle roof systems nrca recommends slopes of 4 12 or more. 5 12 to 12 12 pitch.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. They won t be appropriate for all roofs. Wood and slate shingles do not lock together as tightly as other types of shingles. Nrca s recommended minimum roof slope guidelines for steep slope roof systems generally are greater at steeper inclines than those in the building code.

That works out to about nine degrees if that works better for you.