Roof Slope 1 4 Over 12 Architectural Note

A 4 in 12 slope can be expressed as the ratio of.

Roof slope 1 4 over 12 architectural note.

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. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. 4 12 is the incline of the roof expressed as. Most roof s have a pitch in the 4 12 to 9 12 range.

1 12 roof pitch angle 4 76 degrees. Note the roof material. If a roof rises 1 in a length of 12 this is 1 12 roof pitch. Slopes greater than 18 12 are found on a frame roofs and some mansard style.

0 pitch 1 00x the roof area. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example if you measure 4 inches the pitch of your roof is 4 12.

See low slope roofing. Low slope roofs are from 0 to 3 12 in pitch. This will give you the rise over run or pitch. Some sources consider low slope to include 3 12 pitch roofs.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Since this is a flat roof or nearly flat roof. A wood shingle is cut whereas a shake is split by. Note that roof pitch is sometimes used in parallel with roof 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. 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. However you can only use this pitch with built up roofing or specialized synthetic roofing. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

However roof pitch is technically measured and defined differently and will not be discussed here. I e 4 inches of rise per 12 inches one foot of run. You can measure the roof slope on the bottom side. 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.

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.