How To Measure Roof Surface Area

Climb to the top of your roof.

How to measure roof surface area.

The length l times the height h of a triangle is twice its area a2. To calculate the area of your roof first you ll need to calculate the pitch of it. Outside of the u s a degree angle is typically used. Place the other end of the level at the peak of the roof and hold it level.

Mark a level 12 inches from one end. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. That gives you 5 590 square feet which is the actual area of the surface of the roof. This multiplier number will be used to multiply the surface area calculation that sketchandcalc will provide.

Search with the roof area calculator. For an accurate surface area measurement you should make note of these additional structures. L 30 feet h 12 feet 30 12 2 180 square feet. Next place your ladder against your house at the gable end.

This applies to lengths as well as areas. How to calculate roof surface for a roof incline of pitch x 12. House surface plus the area with which the roof extends outside the house it can be calculated by multiplying the extension with the perimeter of the house. And that s the number you were looking for.

1 roof square 100 square feet. So if you divide your answer of a product of length times height by two you will get the area of a triangle. Using the table below lookup the pitch es and make a note of the number s in the multiplier column. Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.