Minimum Slope For Three Tab Roofing

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Minimum slope for three tab roofing.

Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12. However a roofing project that is characterized by shoddy or amateur workmanship can lead to higher costs in the long run. Item 12061 model sa12. We do install shingles on these in between.

For low slopes as well as any other slope your local building department should be contacted. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. The only function the three tab shingles perform at that low a slope is decorative that s a legitimate use of shingles when you wish to preserve a consistent appearance but they do not function as a weather barrier in such installations that function is being performed it s being performed at all by the underlayment and or flashing below the shingles which in this case must be a. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. What slope is considered low slope for shingles. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Owens corning supreme 33 33 sq ft shasta white 3 tab roof shingles.

With respect to shingle application roof slopes from 2 12 to less than 4 12 18 5 are called low slope roofs while roof slopes of 4 12 or greater are called normal or standard slopes. The minimum roof slope for metal roof panels depend on 3 different scenarios. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Putting a new roof onto a home is an expensive but necessary cost for homeowners.

Asphalt shingles continue to be the most widely installed roof covering option in north america. What precautions need to be taken to install shingles on low slopes. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. Low sloped roof shingle installation.

Many do it yourselfers make this mistake before they even begin. The values given here. Learn what the minimum slope for an asphalt shingle roof is the difference between sloped and flat roofs and how to calculate the slope of any roof. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

Normal roof slope for typical installation.