Roof Area Multiplier

On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.

Roof area multiplier.

That gives you 5 590 square feet which is the actual area of the surface of the roof. And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. Determine how many square feet of roof area a building has by measuring from the ground. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area.

This makes measuring easier knowing that you are able to get the exact measurement of roofs by merely standing on the ground. If this distance measures 4 inches you have a 4 in 12 pitch. Determine how many square feet of roof area a building has by measuring blueprints or plans. This roof pitch chart will give you your multiplier.

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. Now you re ready to price out the materials. 8 inches and you have an 8 in 12 pitch. And that s the number you were looking for.

For multi pitched roofs simply add the areas of all common pitches together by toggling layer visibility from the summed layer identified by the eye symbol at the left of the layers control. Or just enter your numbers into this roof pitch degrees.