How To Measure Roof Surface Area

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

How to measure roof surface area.

Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. Climb to the top of your roof. How to calculate roof surface for a roof incline of pitch x 12. So if you divide your answer of a product of length times height by two you will get the area of a triangle.

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. Outside of the u s a degree angle is typically used. 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.

Place the other end of the level at the peak of the roof and hold it level. 1 roof square 100 square feet. Mark a level 12 inches from one end. For an accurate surface area measurement you should make note of these additional structures.

That gives you 5 590 square feet which is the actual area of the surface of the roof. 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.

Next place your ladder against your house at the gable end. Using the table below lookup the pitch es and make a note of the number s in the multiplier column. First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line. L 30 feet h 12 feet 30 12 2 180 square feet.

This distance is the rise.