Published at Thursday, March 21st, 2019 - 02:41:08 AM. Roof Pitch. By Devona Pelletier.
Asphalt Shingle – The three tab asphalt shingle is arguably the most popular roofing material because of its low cost and relative good looks for the cost. Asphalt shingles typically have a minimum slope rating of 4 in 12. This means that for every 12 inches of horizontal distance across the shed the roof will rise 4 inches.
First, measure 12 inches from one end of the level and make a mark. Then, in the attic, place the end of the level against the bottom of a roof rafter and hold it perfectly level. Now measure vertically from the 12-inch mark on the level straight up to the underside of the rafter, as illustrated.
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