Roof Pitch Factor Formula

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.

Roof pitch factor formula.

Measure from an exterior wall to an exterior wall and divide by two. Calculate the rafter length substituting these values into the following 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. Let s say it is equal to 1 5 m.

Solving for rafter in the above equation gives. The slope factor works with metric and imperial measurements. This calculator calculates the factor for a slope online. 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. Use the factor instead. Roof pitch refers to the slope which the rafter creates. Looking at the chart the factor is 1 0541.

Roof pitch factor rafter over run. The headache of using pythagoras and trigonometry can be spared by making use of these charts. 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. 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.

Rafter sqrt rise 2 run 2. For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet. Multiply the result by the factor and this is the length of the roof from base to ridge. Pitch rise run 1 5 6 25.

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. For example if you measure 4 inches the pitch of your roof is 4 12. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. Roof area in square metres length in metres width in metres slope factor.

In construction the slope factor can be used to easily calculate the area of a roof. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Measure the rise of your roof. 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.

There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Roof pitch factor calculator. This will give you the rise over run or pitch.