Roof Pitch Factor Formula

Roof pitch refers to the slope which the rafter creates.

Roof pitch factor formula.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 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. Roof area in square metres length in metres width in metres slope factor. 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.

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. The roof pitch factor is then the length of the rafter divided by the run and is given by the following roof pitch factor formula. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. Rafter sqrt rise 2 run 2.

Calculate the roof pitch as the proportion of rise and run. Measure the rise of your roof. This calculator calculates the factor for a slope online. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision.

The slope factor works with metric and imperial measurements. Use the factor instead. There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Solving for rafter in the above equation gives.

Pitch rise run 1 5 6 25. Pitched roof provide you protection again heavy rains. For example if you measure 4 inches the pitch of your roof is 4 12. Calculate the rafter length substituting these values into the following formula.

Roof pitch factor calculator. Roof pitch formula image 1 12 to 12 12 roof pitch 7 12 pitch this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations. Measure from an exterior wall to an exterior wall and divide by two. Let s say it is equal to 1 5 m.

In construction the slope factor can be used to easily calculate the area of a roof. This will give you the rise over run or 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

Looking at the chart the factor is 1 0541. Multiply the result by the factor and this is the length of the roof from base to ridge. Roof pitch factor rafter over run.