How Much Roofing Felt Will I Need

Roofing felt is sold by the roll.

How much roofing felt will i need.

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. While the average lifespan for a typical roof can be 15 20 years a long hard winter or a particularly intense storm can cause lasting damage to a roof. One square is equal to 100 square feet. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.

Anyway calculate the area plus overlap in square metres and that number will be the same as the length of 1m wide roofing felt that you ll need. Rolls of felt coverage for roofs is sold in rolls that are one square each. Take the square foot of 5 128 divide by 100 100 sq ft is equal to one square so you have 51 28. 15 pounds per hundred square feet and 30 pounds per hundred square feet.

It takes 3 bundles per square so you will multiply 51 28 by 3 and you will get 153 84. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a 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. Over time that damage could really add up.

For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights. One roofing square equals to 100 square feet. As a result you might need to calculate an estimate of how much it will cost to replace your old roof with a new one. Rolls of felt are 36 wide x 144 long for 15 and 72 long for 30.

Add a square for waste so you will need 157 bundles.