1 2 Inch Slope Roof

We can divide roofs into the following categories.

1 2 inch slope roof.

A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss. 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.

For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks.

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. Roof slopes slope rise run in inches conventional slope 4 in 12 and up. Flat roofs are not perfectly flat in reality they need a small slope for water runoff.

Roof slopes are most commonly defined by the rise over run ratio. Simply put it s a shallow roof. Drag sliders to animate the results and diagram. Generally such roofs have a pitch ranging from 1 2 12 to 2 12.

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. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. The triangle diagram will be re drawn to scale with all dimensions marked. 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.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Flat 0 in 12 to 2 in 12. Low slope 2 in 12 to 4 in 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

What exactly is roof slope. Most roof s have a pitch in the 4 12 to 9 12 range. 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.