1 2 Inch Slope Roof

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

1 2 inch slope roof.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Roof slopes slope rise run in inches conventional slope 4 in 12 and up. Drag sliders to animate the results and diagram. Most roof s have a pitch in the 4 12 to 9 12 range.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important. Flat 0 in 12 to 2 in 12. These roofs have a pitch less than 4 12.

A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. Low slope 2 in 12 to 4 in 12. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. Flat roofs are not perfectly flat in reality they need a small slope for water runoff.

For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. The triangle diagram will be re drawn to scale with all dimensions marked. Simply put it s a shallow roof. 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.

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. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. We can divide roofs into the following categories. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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.