Roof Slope 1 4 Over 12 Architectural Note

This will give you the rise over run or pitch.

Roof slope 1 4 over 12 architectural note.

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. See low slope roofing. Most roof s have a pitch in the 4 12 to 9 12 range. Some sources consider low slope to include 3 12 pitch roofs.

A 4 in 12 slope can be expressed as the ratio of. If the rise is 4 feet over a 24 foot span then the roof pitch is 1 to 6 is expressed as a ratio and in inches per foot. Low slope roofs are from 0 to 3 12 in pitch. 4 12 is the incline of the roof expressed as.

For example if you measure 4 inches the pitch of your roof is 4 12. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. I e 4 inches of rise per 12 inches one foot of run.

Note the roof material. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Slopes greater than 18 12 are found on a frame roofs and some mansard style. 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.

The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. A wood shingle is cut whereas a shake is split by.

1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42. However roof pitch is technically measured and defined differently and will not be discussed here. You can go by the measurements taken by walking the roof. 1 12 roof pitch angle 4 76 degrees.

0 pitch 1 00x the roof area. Note that roof pitch is sometimes used in parallel with roof slope. Since this is a flat roof or nearly flat roof. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Roof slopes are most commonly defined by the rise over run ratio.