Once you've determined the square footage you need to cover, you can calculate the number of packages you need by dividing the total square feet by 33. How many shingles do I need to protect my roof? The surface area of your roof will affect the number of packages or squares you need. A 2,000 square foot roof requires 20 squares or 60 packages. The number of bags or squares you need will depend on the area of your roof and your asphalt or slope. For example, a 2,000 square foot roof will require 20 square feet or 60 packages.
Divide this number by 100 to determine how many roof squares you will need, which equates to 7.56 roof squares. 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. Therefore, 6 packs of shingles are needed to properly cover the roof of a 10×12 shed with a gable roof and a 1' overhang around all sides. Another way to measure the square feet of your roof from the ground is to calculate the number of shingles (or tabs) to calculate the square feet of the 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. Also, be sure to use a roof calculator to check your calculations and determine the square footage of your 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. The number of packages needed to cover a roof square may differ between the manufacturer and the type of roofing material, but a tile square is always 100 square feet.
Take measurements from both sides of the roof and add those numbers together to get the total square of the roof of the house. Mansard roofs have different slopes and configuration steps, but generally the roof area is about twice the footprint in square feet. 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. 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.
We know that each square of roofing requires 3 packs of shingles, so 3 packs of shingles per 1.75 square of roofing equals 5.25 bundles of shingles. 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. Although roofing projects are estimated and sold by the square, roofing material is often not sold in increments of 1 square.