Roof Pitch Level

Pitches above 9 12 are very highly angled and are designated steep slope roofs.

Roof pitch level.

You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. Roof pitch refers to the slope which the rafter creates.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. Divide the results by the number of 12 inch segments in your level. In building construction roof pitch is the steepness of a roof quantified as a ratio or as number of angular degrees that one exposure surface deviates from horizontal level.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. First measure 12 inches from one end of the level and make a mark.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.