Roof 1 Slope

Definitions vary on when a roof is considered pitched.

Roof 1 slope.

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. Sheet metal panels install quickly and easily and can be done without professional assistance especially on low slope roofs and come in a much wider range of colors than other nearly flat roofing options. See low slope roofing. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs.

Flat roofs are not perfectly flat in reality they need a small slope for water runoff. This means that the rise of the slope goes up or down 8 inches for every 12 inches. You can divide roofs into these categories. Thus pitch is typically greater in areas of high rain or snowfall.

A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Some sources consider low slope to include 3 12 pitch roofs. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope.

Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. Low pitched roofs have the pitch below 4 12 33 3. Roof pitch is used to describe the slope or angle of the roof. These are generally difficult in maintenance as they require special materials to avoid leaks.

Standing seam metal roofs with mechanical lock systems to ward off leaks can be successfully and attractively installed on roofs with at least a slope of 1 in 12. These roofs have a pitch less than 4 12. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

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. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.

An example for a steep sloped roof is 8 12. Minimum roof slope roof pitch r905 9 1. Low slope roofs are from 0 to 3 12 in pitch. The exact roof slope in degrees is given by the arctangent.

To put it in perspective the angle of this slope would be around 30 degrees.