With the above information, it is possible to work out how much insulation you may need, how many roof vents you’ll need to install, and how many roof tiles to purchase. Because this is only one half of the roof, we will need to double this number to find the entire roof area (121.45m²). So, for our example the half roof area is as follows: 8.7m x 6.98m = 60.73m². The length of the roof is 8.7m for this square house, as 8.7m x 8.7m is 76m² (total floor space). Please note: if you are working out how many roof tiles you need, this calculation assumes there is no chimney or other section of the roof not covered by tiles. Take this example of a perfectly square house with 76m² floor space, a 45° pitched roof and a 2.35m roof height. Roof width (m) x roof slope height (m) = half roof area (m²) How to calculate the roof area of a building However, if access isn’t available to these plans, the local council should be able to provide this. Most owners will have access to this information from building plans obtained upon purchase of the property. If you have these dimensions, the pitch of the roof won’t matter. To calculate the roof area of one side, simply multiply the length of your roof by the roof slope height. This measurement is different from the height of the roof, which is taken at the apex where both sides meet. Next, you will need the roof slope height. This is the length of the wall of your property on which the bottom of the roof sits. How to calculate the roof area of a buildingįirstly, you will need the measurement for the length of your roof.What you need to calculate the roof area.To calculate the roof area of a property with a classic gable roof (on which two roof sections meet in the middle in an inverted ‘V’ shape), all you need are two key dimensions. Roof projects may include tiling, installing insulation, ventilation and installing guttering. When undertaking work on a roof, accurate measurements are important.
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