1 2 Inch Slope Roof

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. Drag sliders to animate the results and diagram. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7.

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Low slope 2 in 12 to 4 in 12.

1 2 inch slope roof.

These roofs have a pitch less than 4 12. We can divide roofs into the following categories. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard.

A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. 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. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

Flat roofs are not perfectly flat in reality they need a small slope for water runoff. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss. Most roof s have a pitch in the 4 12 to 9 12 range.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. What exactly is roof slope. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Roof slopes are most commonly defined by the rise over run ratio.

Simply put it s a shallow roof. The triangle diagram will be re drawn to scale with all dimensions marked. Flat 0 in 12 to 2 in 12. 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. 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. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. Roof slopes slope rise run in inches conventional slope 4 in 12 and up.

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