How To Work Out The Size Of A Roof

You will need to express this size in terms of square feet.

How to work out the size of a roof.

Be sure to find the area of any dormers on your roof as well. Just multiply the length and width dimensions. 1 roof square 100 square feet. The length l times the height h of a triangle is twice its area a2.

Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. The first step in a free roofing estimate is measuring the roof dimensions. Roof span 2 x roof pitch constant for rafter rafter length. Measure the span building width or run half building width roof measurement guide.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. How to calculate the roof area of a building 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. 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. Make a note of the square footage of each square or rectangular section on your diagram. It is often compared to slope but is not exactly the same. Roof length x half roof width x roof height 2 roof area calculate the area of a roof to work out how much guttering is required so for a roof that is 5 m long with a height of 4 m and the roof width is 8 m which makes the half roof width 4m we can calculate the effective roof area like this.

L h 2 area calculating an area of a triangle when estimating a roof. If a section is 120 feet 37 m x 100 feet 30 m its total square footage would be 12 000 square feet 1 100 m 2. 5m x 4m x 4 2 40 square metres. Work out the rafter or hip valley length.