By Angelique Alves. Roof Pitch. Published at Monday, April 15th, 2019 - 14:39:27 PM.
Historically the word ”pitch” meant a ratio between the ridge height to the entire span/width of the building or ratio between the rafter length to the building width. And back then, the ridge was typically in the middle of the span. This is no longer the case in modern building practices.
Pitched roofs not only introduce greater degrees of installation difficulty into the cost structure, but they also permit the complicated roof complexes on some residences. Pitched roofs are most often the Provence of shingles, although standing seam roofs are becoming ever more popular on pitched roofs as well.
Pitched roofs begin with with slopes greater than 3-in-12. The 45-degree roofs seen on A-frame houses are 12-in-12 but roofs can be even steeper – consider the mansard roofs introduced by French Second Empire architects in the middle of the 1800s. These roofs with nearly vertical faces can boast a pitch of 20-in-12.
Both the asphalt shingles and metal roofs can be installed on a low slope lean to shed roof if the proper product is used and it is installed properly. Regular asphalt shingles that are rated for 4 in 12 roof slopes can be installed on lower slope roofs by simply installing a waterproof membrane under them.
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