You will need approximately 30 packages of standard size 3-tab asphalt shingles (10 × 3% 3D 30 packs) or 40 packages of architectural shingles (10 × 4 %3D 40 packs) for 1000 square feet. Therefore, for a 1,000-square-foot gable roof, approximately 30 packages of shingles plus 10% of the ridge, starter, and waste would be needed. Since there are twenty-six shingles in a twenty-year-old shingle package (which is fine to start with and for the edges), divide the result by twenty-six. For the number of crests, multiply the length of the hip or crest by twelve and divide it by five.

This home is 1000 square feet. It requires 18 squares of shingles. Most roofs are 4 packs per 100 square feet for dimensions plus a waste of approximately 20 to 30 percent or 3 percent per square for normal shingles. Calculate the size of your roof and calculate how many packages of shingles, rolls of felt and squares of roofing material you need for a new roof.

The most accurate way to calculate how many packages of shingles you'll need is to climb onto the roof and measure each plane of the roof. So while, for example, you get fewer architectural tiles in a package than in a standard tile, those architectural tiles cover a larger area, so the square footage is almost the same. Now that you know how many packages of shingles will be needed, keep in mind that there are other roofing materials you should consider. While asphalt is the cheapest roofing material, there are 3 different types of asphalt shingles that vary in price and affect the amount you'll spend to replace the roof.

So, there are 39 packages of standard size 3-tab shingles you'll need to cover the roof of a 1000 square foot home. Although roofing projects are estimated and sold by the square, roofing material is often not sold in 1-square increments. Calculating how many shingles you need for your roof is very similar to calculating how much carpet you need for floors or how much wallpaper you need for walls; simply determine the roof area and divide by the area covered by each package of shingles. Steeper roofs usually require more shingles to adequately cover the area, which means a more expensive roofing bill.

Anti-drip boards and drip boards are sold per linear foot, find the perimeter of your roof in feet to find the length of the drip boards and the necessary fascia boards. For example, a very steep roof in a 1,000-square-foot attic will need more shingles than a roof with a lower slope in an attic of the same size. Attic roofs have different slopes and inclines in configuration, but generally the roof area is approximately twice the size in square feet. Then multiply the roof footprint by the multiplier below to calculate the total roof area.