Pitch Of Roof

The rafters equal the span.

Pitch of roof.

Commonly used roof pitches were given names such as greek. There is no standard universal roof pitch. 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. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Pitches above 9 12 are very highly angled and are designated steep slope roofs. The most commonly used roof pitches fall in a range between 4 12 and 9 12. How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

In the uk the typical house has a pitch between 40 50 although 45 should be avoided. In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. Roof pitch refers to the slope which the rafter creates. Roof pitch varies depending on culture climate style and available materials.

The ridge height is 2 9ths to 1 3 the span an angle of 24 to 34. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16. Although most homeowners do not need to measure pitch it still pays to understand this term. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. First measure 12 inches from one end of the level and make a mark. In the usa the range of standard pitches is anywhere between 4 12 and 9 12.

The rafter length is 3 4 the span about 48.