1 12 Roof Slopes

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

1 12 roof slopes. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs. Minimum roof slope roof pitch r905 10 2 1. Some sources consider low slope to include 3 12 pitch roofs. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. I e 4 inches of rise per 12 inches one foot of run. Roof pitch what is a 1 12 roof pitch if a roof rises 1 in a length of 12 this is 1 12 roof pitch.

This ratio is always expressed as inches per foot. This topic has been closed by the administrator. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The slope can be expressed numerically as a ratio.

Roof slopes roof slopes are identified using the gradient method described above where the rise varies but the run is usually 12. I am currently shopping for a new roof. Note that roof pitch is sometimes used in parallel with roof slope. See low slope roofing.

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. In some very steep roofs you may see the gradient inverted so that the run varies but the rise is held as 12. Low slope roofs are from 0 to 3 12 in pitch. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Many contractors have told me that my only option is paper or gravel roof. I currently have a old shingle roof that s over 20 years old and needs to be replaced. The roofer making the complaint said that he bid that job and lost to a lower bidder while thinking that the only suitable materials would include mule hide epdm or high rib steel.

However roof pitch is technically measured and defined differently and will not be discussed here. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12. Then you ll be able to measure slope from an unfinished attic space under the roof. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

The roof slope is only 1 12.