Maximum Roof Pitch For Asphalt Shingles

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.

Maximum roof pitch for asphalt shingles.

The minimum slope for an asphalt shingle roof is 2 12. Minimum required roof slope for roofing materials. Fortunately the requirements are quite accommodating. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Considering the roof slope requirement is important. 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. 9 46 built up roof asphalt.

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. Secure the shingle to the roof deck with fasteners as recommended by the roofing manufacturer. Shingles of all types need to have a slope to function properly. 5 12 to 12 12 pitch.

Asphalt felt paper that is tacked to the roof sheathing. For example if it is a very low slope water including snowmelt or. That works out to about nine degrees if that works better for you. They won t be appropriate for all roofs.

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. Roofing material or system. Why is 2 12 the minimum. Asphalt shingles continue to be the most widely installed roof covering option in north america.

Asphalt shingles do require that you have a minimum pitch to your roof. The maximum slope considered suitable for normal shingle application is 45 degrees or 12 per foot. 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. Pitched roofs are most often associated with asphalt shingles although standing seam roofs are becoming ever more popular on pitched roofs as well.

If a roof slope exceeds this limitation the shingles should be applied by the following recommended method complying with astm d4586. Wood and slate shingles do not lock together as tightly as other types of shingles. The minimum requirement is 2 12. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

18 43 asphalt shingles with special underlayment requirements 2 in 12. What is the minimum pitch slope of an asphalt shingle roof. There are plenty of other options however for flat and nearly. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt 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.