How Do You Work Out The Area Of A Roof

Multiply the area by the pitch multiplier to get the roof s square footage.

How do you work out the area of a roof.

For example if your measurement is seven inches the rise is expressed as 7 12 in roofing terminology. On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. To calculate the area of your roof first you ll need to calculate the pitch of it. 1 roof square 100 square feet.

Place the other end of the level at the peak of the roof and hold it level. Next you will need to use a roofing materials calculator. The calculator cannot account for complex shapes based on a measurement of square footage alone. If the roof has multiple pitches such as those found on dormer windows or porches you will need to draw these separately.

After drawing the perimeter of the roof add a new drawing layer with the plus symbol found in the bottom right corner. Simply input the surface area of the roof choose from one of the available options and you will get your first roofing estimate. Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. 8 inches and you have an 8 in 12 pitch.

If this distance measures 4 inches you have a 4 in 12 pitch. The calculated area is only an estimation. Climb to the top of your roof. Pitch measurement method 1.

The number you get will be an accurate estimate of how much area you have to cover for your roofing project. This distance is the rise. Then take the product of these two dimensions and multiply it by your pitch multiplier. Next place your ladder against your house at the gable end.

With an online roofing calculator you will usually be able to drill down a bit deeper in order to see a fine grained cost breakout on a sq ft basis. The length l times the height h of a triangle is twice its area a2. L h 2 area calculating an area of a triangle when estimating a roof. Then proceed to draw the surface area of the roof that has a different pitch.

First multiply the length by the width. Roof width m x roof slope height m half roof area m take this example of a perfectly square house with 76m floor space a 45 pitched roof and a 2 35m roof height. The roof slope height is 6 98m. First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line.