How To Measure Roof Surface Area

This multiplier number will be used to multiply the surface area calculation that sketchandcalc will provide.

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. And that s the number you were looking for. This distance is the rise. How to calculate roof surface for a roof incline of pitch x 12.

Next place your ladder against your house at the gable end. For an accurate surface area measurement you should make note of these additional structures. Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. To calculate the area of your roof first you ll need to calculate the pitch of it.

Place the other end of the level at the peak of the roof and hold it level. Climb to the top of your roof. Mark a level 12 inches from one end. Using the table below lookup the pitch es and make a note of the number s in the multiplier column.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. L 30 feet h 12 feet 30 12 2 180 square feet. That gives you 5 590 square feet which is the actual area of the surface of the roof. Outside of the u s a degree angle is typically used.

The length l times the height h of a triangle is twice its area a2. Search with the roof area calculator. This applies to lengths as well as areas. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

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.