Roof Slope Factors For Roofs

The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages.

Roof slope factors for roofs.

The list below contains the common roof slopes and the terms which classify them. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. The overall length of the roof or a common rafter from the base to the ridge is. Length of the rafter.

For instance if the measurement was 3 your roof slope factor would be 3 12 and you. Ice dams and icicles along eaves. This way it also requires very less maintenance as compare to flat roofs. Roof slope factor for multiple folded plate sawtooth and barrel vault roofs.

A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. 2 12 4 12 conventional slope roof. Multiple folded plate sawtooth or barrel vault roofs shall have a c s 1 0 with no reduction in snow load because of slope i e p s p f. You could calculate the slope factor for every single roof pitch but as a public service many roofing.

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. 9 12 20 12 steep slope. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. This way the pitch of the roof and the slope of the roof can be measured.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Last updated july 10 2020. Measurement of your house roof pitch is one of the. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

The length of the rafters can also be determined while determining the slope. The higher the slope the steeper it is. The roof slope factor is written as x 12 where x is the vertical distance you measured from roof to level. Then you ll be able to measure slope from an unfinished attic space under the roof.

Roof slope expressed as rise in run degrees and percentage. This roof slope factor table also consists of hip and valley factors to measure the possible hips and valleys.