As a rule of thumb, you will need 3 packs of standard size 3-tab asphalt shingles or 4 packs of architectural shingles for a 100 square foot roof. So, for a 1000 square foot gable roof, you would need 30 packs of shingles. For a 1200 square foot gable roof, you would need 36 packs of shingles. Since there are twenty-six shingles in a twenty-year shingle package (which is good for starters and edges), divide the result by twenty-six.
For the number of ridges, multiply the length of the hip or ridge by twelve and divide it by five. This house is 1000 square feet. Requires 18 tile squares. For a gable roof that is easy to raise and return, you'll multiply the roof footprint by 1.3 to get the square feet of your roof.
Calculate the size of your roof and estimate how many packs of shingles, felt rolls and squares of roofing material you need for a new roof. The most accurate way to calculate how many packs of shingles you will need is to climb onto the roof and measure each plane of the roof. Mansard roofs have different slopes and configuration steps, but generally the roof area is about twice the footprint in square feet. Calculating the amount of shingles you need for your roof is very similar to calculating how much carpet you need for your floors or how much wallpaper you need for your walls; simply determine the ceiling area and divide by the area covered by each pack of shingles.
Some special types of larger or thicker asphalt shingles may require 4 posts per square foot, but the maximum size of roof walls is 3 posts to cover the 100 square foot roof. When you talked about Roofing it's all about using the term “square”, a “square” equal to 100 square feet of roof or an area of 10 feet by 10 feet. The quotation footage of roofs is different from the square footage of the house Depending on where the source comes from, the basis on which the estimated number of roofs is calculated will be determined. These numbers help find the roof pitch multiplier, which then allows you to find the total area of the surface by multiplying it by the area covered by the roof.
Some special styles of asphalt shingles that are larger or thicker may require 4 packs per square, but the vast majority of roof shingles are three packs to cover 100 square feet of roof. Although roofing projects are estimated and sold by the square, roofing material is often not sold in increments of 1 square. The average roll of 15-pound roofing felt covers approximately 400 ft2, or 4 square, while the average roll of 30-pound roofing felt covers approximately 200 ft2, or 2 square. For example, a very steep roof in a 1,000 square foot attic will need more shingles than a lower pitched roof in the same size attic.
Complex roofs especially require additional shingles to be cut to accommodate complicated roof edges and corners. Steeper roofs generally require more shingles to properly cover the area, which means a more expensive roofing bill.
