Roof Area Pitch Factor

If the area is 10 000 squares then roof pitch would be 12 500 10 000x1 25.

Roof area pitch factor. The procedure to follow is the same. 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. What is the roof pitch factor. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.

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. It is sometimes called the roof pitch multiplier. The roof pitch conversion factor is a number that when multiplied by the area covered by the roof gives an estimate the total surface area of the sloped roof itself. So keeping with our roof pitch of 4 this gives us 1 9.

For example if you measure 4 inches the pitch of your roof is 4 12. The maths behind this number is that it is the square root of rise run 2 1. It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. The formula for the roof pitch multiplier comes from the formula for a right triangle and more specifically the pythagorean theorem.

How roof area is calculated. You can calculate roof pitch from the rafter tail bottom or at a barge rafter at the gable end on the roof over hangs. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. A 12 in 12 pitch is a steep 45 degree angle roof.

This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. Feet the area of a hip roof equals the area of a gable roof with the same dimensions. Then multiply the square footage with the roof pitch factor to get the total area of the roof. In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table.

Roof pitch affects the actual area of the roof. This will give you the rise over run or pitch. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

Add 1 then take the square root. Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about 1 0541. 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.