By Bartlett Faure. Roof Pitch. Published at Monday, September 17th, 2018 - 22:25:16 PM.
The slope of a roof affects its ability to shed water and determines the limits for using asphalt shingles. Most asphalt shingles may be used on roof slopes from 4:12 to 21:12, using standard application methods. Asphalt shingles may be used on slopes from 2:12 to 3.9:12, if special low-slope application procedures are followed.
Both the asphalt shingles and metal and application techniques will allow you to have a lean to shed and keep the roof height down so your neighbors don’t wonder where the sun went. By understanding how lean to shed plans can detail the proper design to facilitate a low slope material installation.
The slope can be expressed numerically as a ratio. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example, a “4 in 12” slope can be expressed as the ratio of 4:12. A “6 in 12” slope is expressed as 6:12.
The problem with low slope roofs is that they are more likely to leak because of the water does not run off them as fast as when they are built with steeper pitches. Before you build a lean to shed it is wise to get a better understanding of the different roofing materials and how they can be used to cover your lean to shed without the fear of a leaks.
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