Minimum Slope For Three Tab Roofing

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Minimum slope for three tab roofing.

What slope is considered low slope for shingles. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Many do it yourselfers make this mistake before they even begin.

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. However a roofing project that is characterized by shoddy or amateur workmanship can lead to higher costs in the long run. Putting a new roof onto a home is an expensive but necessary cost for homeowners. The minimum roof slope for metal roof panels depend on 3 different scenarios.

If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. Item 12061 model sa12. Normal roof slope for typical installation.

For low slopes as well as any other slope your local building department should be contacted. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Low sloped roof shingle installation. Owens corning supreme 33 33 sq ft shasta white 3 tab roof shingles.

What precautions need to be taken to install shingles on low slopes. Asphalt shingles continue to be the most widely installed roof covering option in north america. 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. The values given here.

We do install shingles on these in between. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Starter shingles installed incorrectly or not at all. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.