Plan Roof Area Formula

The base width is the distance from one corner of your roof to the other at its base on the short side of your house.

Plan roof area formula.

Calculating area is easy in two dimensions but nearly all roofs slope up to a peak which adds a third dimension. Once you have your roof s pitch divide the number by 12. This would yield 1 3 next square your result. Roof pitch is given as the number of inches in height change over the distance of one foot.

To do that you need to accurately calculate the area of your roof. This applies to lengths as well as areas. Area is defined as the expanse or measurement of a given surface and there are a few methods for measuring your roof s area. A rafter for a roof with a 6 12 slope will be 1 118 times as long as the.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. 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. That gives you 5 590 square feet which is the actual area of the surface of the roof. Adjust to suit for a good straight fascia add an extra 20 mm or so to the tails of all your rafters total length.

The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. The most common roofing materials used in the united states include shingles membrane roofing and ceramic tile all of which have different life spans. Shingle roofs typically have a life span of 15 30 years. And that s the number you were looking for.

If you re planning to put a new roof on your house it s important to purchase enough matching shingles to complete the job. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator. How to calculate the roof area of a building. Our roof calculator uses base length and base width to find the estimated area.

For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Dividing by 12 gives the ratio of inches in rise per distance. Rafter join detail hip roof framing hip to common to ridge join diagram. The roof slope height is 6 98m.

Print full scale paper templates cut and fold over wood to mark and cut angles. Hip roof framing calculator plan diagram with full dimensions. The roof area for a hip end is the same as for a gable end the intersection is equivalent to a hip slightly conservative so there is usually no need to consider triangles when measuring a roof.