How Many Squares Roofing Felt Do I Need

To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in the roof.

How many squares roofing felt do i need.

In order to know the appropriate amount of roofing felt to use the roof pitch will need to be calculated first. 15 pounds per hundred square feet and 30 pounds per hundred square feet. In high wind areas you need five nails per shingle or 480 nails per square. Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material.

Rolls of felt are 36 wide x 144 long for 15 and 72 long for 30. One and a half inch roofing nails typically have a large 11 gauge shank and an oversize 7 16 inch flat head. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection. As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.

Our felt roof shingles calculator has been designed to work for a 2 sided apex roof using roof shingles that cover 3m2 per pack. You will need to order enough packs of roof shingles to cover the main body of your roof and then extra to cover the ridge. Roofing felt is sold by the roll. Roofing felt also known as tar paper is a roll of felt coverage is often used when constructing a roof.

How many roofing shingles do i need. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square.

The average roll of 15 pound roofing felt covers about 400 ft 2 or 4 squares while the average roll of 30 pound roofing felt covers about 200 ft 2 or 2 squares. Explore a number of housing related calculators as well as hundreds of other calculators covering topics such as finance math health fitness and more. How many rolls of felt will you need. To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.

This free roofing calculator estimates the area of a roof and the amount of materials required to replace or build said roof. Roof surfaces are measured in squares a square is an area of roof which measures 100 square feet. The most common type of shingle. The result is 240 and this means you would need 240 squares of shingles to cover that roof.

For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights.