How Much Is An Average Roof Surface Area

Annual rainfall in millimetres x roof surface area in square metres roof catchment capacity.

How much is an average roof surface area.

A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof. While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12. How to calculate the roof area using the building square footage the pitch of the roof. Anything more than 9 in 12 is considered steep.

You want a roof area calculator that provides accurate estimates to help you order materials such as shingles membrane roofing or ceramic tile. A low slope roof is anywhere from 2 in 12 to 4 in 12. Average would not be a real meaningful number depends too much on the overhang and the shape of the house and roof slope. These benefits do not come cheaply though.

Conventional slope roof range between 4 in 12 and 8 in 12. Roughly speaking 1 millimetre of rain over 1 square metre of roof equals 1 litre of water. Calculating the surface area of a sloped roof can be time consuming without the right tools. As such while it can be cumbersome measuring the area and pitch of each part of the roof and multiplying by the corresponding correction factor will result in the most accurate estimate of necessary.

Start the project with a roof area calculator. For instance a 20x100 house with 3 foot overhangs would have 26x106 foot plan on the roof or 2756 sf for a flat roof.