Roof Slope 1 4 Over 12 Architectural Note

0 pitch 1 00x the roof area.

Roof slope 1 4 over 12 architectural note. Since this is a flat roof or nearly flat roof. Most roof s have a pitch in the 4 12 to 9 12 range. However roof pitch is technically measured and defined differently and will not be discussed here. Note that roof pitch is sometimes used in parallel with roof slope.

A wood shingle is cut whereas a shake is split by. 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. Note the roof material.

This will give you the rise over run or pitch. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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. Slopes greater than 18 12 are found on a frame roofs and some mansard style.

You can measure the roof slope on the bottom side. I e 4 inches of rise per 12 inches one foot of run. 1 12 roof pitch angle 4 76 degrees. A 4 in 12 slope can be expressed as the ratio of.

For example if you measure 4 inches the pitch of your roof is 4 12. However you can only use this pitch with built up roofing or specialized synthetic roofing. See low slope roofing. 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.

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. Some sources consider low slope to include 3 12 pitch roofs. 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. You can go by the measurements taken by walking the roof.

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

If a roof rises 1 in a length of 12 this is 1 12 roof pitch.