Steel Shingle Roof Minimum Slope

Shingles of all types need to have a slope to function properly.

Steel shingle roof minimum slope.

Minimum metal roof slope depends on the roof profile building design climate and site location. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. The minimum requirement is 2 12. Both are located in southern new england not serious snow country for a mainer like myself but problems developed nonetheless.

In case a slope greater than this is necessary then a double underlayment application must be used as per the requirements of the international building code. Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope. Low slope standing seam roofs presently we are consulting on a couple of metal roofs where the architect designed a slope of 1 4 inch per foot. 30 asphalt saturated felt applied horizontally in shingle fashion on roof decks having a slope of 4 12 18 degrees or more.

The following table provides the minimum required. Minimum pitch for corrugated metal roof. For roof decks having slopes of 3 12 14 degrees up to 4 12 18 degrees a minimum of two layers of no. The span for both roofs was 200 feet or more.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof. The minimum pitch for.

That works out to about nine degrees if that works better for you. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. Metal panel roof systems for low slope applications. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

I e 4 inches of rise per 12 inches one foot of run. Nrca recommends a minimum of one layer of no. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Determine the minimum slope of the roof based on the roofing material.

Low slope metal roofs require less material which reduces the overall load on the building s structure. Roof slope equivalents as rise.