How To Measure Roof Surface Area

First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line.

How to measure roof surface area.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. 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. How to calculate roof surface for a roof incline of pitch x 12. Next place your ladder against your house at the gable end.

Place the other end of the level at the peak of the roof and hold it level. Outside of the u s a degree angle is typically used. So if you divide your answer of a product of length times height by two you will get the area of a triangle. For an accurate surface area measurement you should make note of these additional structures.

Mark a level 12 inches from one end. 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. The length l times the height h of a triangle is twice its area a2. This multiplier number will be used to multiply the surface area calculation that sketchandcalc will provide.

Search with the roof area calculator. This applies to lengths as well as areas. 1 roof square 100 square feet. Using the table below lookup the pitch es and make a note of the number s in the multiplier column.

Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. That gives you 5 590 square feet which is the actual area of the surface of the roof. L 30 feet h 12 feet 30 12 2 180 square feet. And that s the number you were looking for.

To calculate the area of your roof first you ll need to calculate the pitch of it.