Roof Pitch Factor Formula

For example if you measure 4 inches the pitch of your roof is 4 12.

Roof pitch factor formula.

Roof pitch factor rafter over run. The headache of using pythagoras and trigonometry can be spared by making use of these charts. Let s say it is equal to 1 5 m. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

Rafter sqrt rise 2 run 2. This will give you the rise over run or pitch. Calculate the roof pitch as the proportion of rise and run. 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.

Multiply the result by the factor and this is the length of the roof from base to ridge. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision.

This calculator calculates the factor for a slope online. Roof pitch factor calculator. There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Use the factor instead.

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. 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. Measure from an exterior wall to an exterior wall and divide by two.

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 the rise of your roof. The slope factor works with metric and imperial measurements. Roof area in square metres length in metres width in metres slope factor.

For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. In construction the slope factor can be used to easily calculate the area of a roof. Pitch rise run 1 5 6 25.

Solving for rafter in the above equation gives. Pitched roof provide you protection again heavy rains. Looking at the chart the factor is 1 0541.