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1 2 inch slope roof.
Generally such roofs have a pitch ranging from 1 2 12 to 2 12.
Low slope 2 in 12 to 4 in 12.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
What exactly is roof slope.
The triangle diagram will be re drawn to scale with all dimensions marked.
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.
Flat roofs are not perfectly flat in reality they need a small slope for water runoff.
Slope conversion tables 1 4 1 2 3 4 1 1 1 4 1 1 2 1 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 2 25 3 4 5 6 7 8 9 10.
A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.
The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.
Flat roofs which aren t perfectly flat require a small slope to allow for water runoff.
We can divide roofs into the following categories.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Simply put it s a shallow roof.
Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7.
A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
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.
These roofs have a pitch less than 4 12.
If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss.
Flat 0 in 12 to 2 in 12.
Roof slopes are most commonly defined by the rise over run ratio.
Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
Most roof s have a pitch in the 4 12 to 9 12 range.
Roof slopes slope rise run in inches conventional slope 4 in 12 and up.
For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard.
