How Many Squares Roofing Felt Do I Need

The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.

How many squares roofing felt do i need.

Roof surfaces are measured in squares a square is an area of roof which measures 100 square feet. 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. To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100. For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights.

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. The most common type of shingle. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square. 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. However shingles are packaged in a way that they are light enough for the average person to carry around. In order to know the appropriate amount of roofing felt to use the roof pitch will need to be calculated first. The result is 240 and this means you would need 240 squares of shingles to cover that roof.

One and a half inch roofing nails typically have a large 11 gauge shank and an oversize 7 16 inch flat head. This free roofing calculator estimates the area of a roof and the amount of materials required to replace or build said roof. Roofing felt is sold by the roll. 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. Roofing felt also known as tar paper is a roll of felt coverage is often used when constructing a roof. 15 pounds per hundred square feet and 30 pounds per hundred square feet. As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.

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. Our felt roof shingles calculator has been designed to work for a 2 sided apex roof using roof shingles that cover 3m2 per pack. Then add 10 to the number to account for waste. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.

Rolls of felt are 36 wide x 144 long for 15 and 72 long for 30.