Roof Pitch Factor Formula

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.

Roof pitch factor formula.

For example if you measure 4 inches the pitch of your roof is 4 12. Calculate the roof pitch as the proportion of rise and run. Roof pitch refers to the slope which the rafter creates. Pitch rise run 1 5 6 25.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Roof area in square metres length in metres width in metres slope factor. 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. Looking at the chart the factor is 1 0541.

Use the factor instead. For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet. This will give you the rise over run or pitch. 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.

There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Let s say it is equal to 1 5 m. The slope factor works with metric and imperial measurements. 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 factor rafter over run. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. Pitched roof provide you protection again heavy rains.

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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Measure from an exterior wall to an exterior wall and divide by two. 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.

In construction the slope factor can be used to easily calculate the area of a roof. Multiply the result by the factor and this is the length of the roof from base to ridge. Solving for rafter in the above equation gives. Rafter sqrt rise 2 run 2.

The headache of using pythagoras and trigonometry can be spared by making use of these charts. This calculator calculates the factor for a slope online. 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.