There are a number of ways to find roofing contractors in your area. Perhaps the easiest is to check the yellow pages either online or in a traditional phone book. You might also consult the local builders' association. Or use the special sites for finding contractor by zip. F.ex - servicewhale.com
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The roofing industry speaks of a "square" as meaning 100 square feet. So, if your contractor says your roof is about 9 squares, he means it will require about 900 square feet of materials in order to cover the surface area of your roof.
-- Find out the population of the area. -- Find out the area of the area. -- Divide the population by the area. The result is the population density of the area.
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The formula to find the area of an octagonal pyramid is area of base plus area of sides.
A foot span is a term used in the roofing industry to calculate the area of a roof. It is necessary to calculate how many shingles per foot. This measurement will vary depending on the type of shingles used.