How To Measure Roof Surface Area

Next place your ladder against your house at the gable end.

How to measure roof surface area.

Mark a level 12 inches from one end. The length l times the height h of a triangle is twice its area a2. So if you divide your answer of a product of length times height by two you will get the area of a triangle. 1 roof square 100 square feet.

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. L 30 feet h 12 feet 30 12 2 180 square feet. For an accurate surface area measurement you should make note of these additional structures.

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

How to calculate roof surface for a roof incline of pitch x 12. To calculate the area of your roof first you ll need to calculate the pitch of it. 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. Search with the roof area calculator.

Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. And that s the number you were looking for. 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. Using the table below lookup the pitch es and make a note of the number s in the multiplier column.

This applies to lengths as well as areas.