1 2 Inch Slope Roof

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

1 2 inch slope roof.

If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Flat 0 in 12 to 2 in 12.

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. Most roof s have a pitch in the 4 12 to 9 12 range. We can divide roofs into the following categories. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks.

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 triangle diagram will be re drawn to scale with all dimensions marked. Drag sliders to animate the results and diagram. Roof slopes slope rise run in inches conventional slope 4 in 12 and up.

What exactly is roof slope. Flat roofs are not perfectly flat in reality they need a small slope for water runoff. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. These roofs have a pitch less than 4 12.

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. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. 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.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Low slope 2 in 12 to 4 in 12. 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.

Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. 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.