How To Estimate Roof Size

Keep in mind that using google earth isn t going to give you a 100 percent accurate reading but it will give you a basic idea of the size of the roof for your calculations for the roofing materials. Don t use this as your only method of measuring. 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.

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To accurately calculate the area of your roof you must first determine its slope or pitch.

How to estimate roof size.

A 12 in 12 pitch is a. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. This is a rather complicated way to estimate a roof area and hardly suited to the diy fans. To calculate the size of the roof you need to measure the size of the roof as if it were flat account for roof pitch calculate square footage and finally determine how many squares of material are required for the roof the calculator above can handle all of this simply enter the length width and pitch and it will determine the size of the roof in squares.

Steps method 1 of 2. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. Low medium or high. Roofs have one of three pitches.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. 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. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square. You will need to express this size in terms of square feet.

Just use it as a starting point and you ll have a fairly basic idea of what you re dealing. The first step in a free roofing estimate is measuring the roof dimensions. Estimate the pitch of the roof. If getting onto your roof isn t an option you can also estimate its size from the ground by measuring the area of the exterior walls and multiplying that number by the roof s slope.

From the diagrams there are two intersecting roofs measuring 114 feet and 30 feet at the eaves with equal rake of 18 feet. To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in the roof. A low pitch rises 3 inches every 12 inches of base horizontal length.

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