How Many Roof Shingles Do I Need

As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.

How many roof shingles do i need. Roofing felt is sold by the roll. To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100. The result is 240 and this means you would need 240 squares of shingles to cover that roof. X research source calculate your roof pitch to determine how steeply your roof slopes.

For a new roof you will also need the same amount of underlayment. However shingles are packaged in a way that they are light enough for the average person to carry around. Note that in the last 3 4 years costs of roof shingles and many accessories have gone down by an average of 18 20 currently the us national average for benchmark architectural shingles is around 74 51 square or 25 per bundle. The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.

This overhand measurement will need to be added to the measurement of the building. Once you have these measurements you will need to calculate the area of the roof and then you can see how many shingles you will need. So in the gable roof example above you need 240 squares of underlayment. Cutting shingles also generates waste.

For example you may need to pay double the cost in asphalt shingles if your roof has a 12 12 pitch a rise of 12 inches 30 cm per 1 foot 0 30 m as opposed to a 4 12 pitch. A typical bundle of shingles weighs about 75 pounds while some premium products can weigh over 100 pounds per bundle so consider delivery of materials. The average roll of 15 pound roofing felt covers about 400 ft 2 or 4 squares while the average roll of 30 pound. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.

If you order shingles based solely on the area of the roof you won t have enough. You ll need shingles for starter courses along the eaves and sometimes at rakes and you ll need shingles to cap hips and ridges. Roof surfaces are measured in squares a square is an area of roof which measures 100 square feet. 1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.

At this point you will also need to estimate or measure the overhang if you have one. How many extra shingles should you buy. How many rolls of felt will you need.