How Many Squares Roofing Felt Do I Need

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

How many squares roofing felt do i need.

Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years. If you re using 15 underlayment and your roof slope is greater than 4 12 use 1 layer. The most common roofing materials used in the united states include shingles membrane roofing and ceramic tile all of which have different life spans. Always double check with the roofing calculator to make sure that you have enough felt to cover the entire area of the roof.

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. Check that your footage measurements are within this range so you can start off on the right foot. Determine the number of rolls of underlayment needed. The result is 240 and this means you would need 240 squares of shingles to cover that roof.

The 15 type is most commonly used and one roll of 15 underlayment covers 4 squares. However shingles are packaged in a way that they are light enough for the average person to carry around. You will need to express this size in terms of square feet. For a new roof you will also need the same amount of underlayment.

The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square. Roofing paper or felt normally comes in about 150ft rolls and are 3ft wide. There are also 29 standard sized shingles measuring 12 inches by 36 inches in each one of these. To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.

As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles. Roofing is sold in 100 square foot lots so you need 21 squares of shingles and 2 100 square feet of 15 pound 15 felt paper and about 50 pounds of galvanized roofing nails. Roofing felt is sold by the roll. Figure about 450 square feet of felt.

A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. 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. One roofing square equals to 100 square feet.

If the slope is between 3 12 and 4 12 double the amount and put down 2 layers. Remember when estimating required amounts that you need to overlap the felt about. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. I think 185 per square is a decent price to remove and replace shingles.

How many rolls of felt will you need.