Measure the pitch of your roof in the attic.
How do you figure shingles for a roof.
Approximate price in dollars the estimate of a final price will depend to a large degree.
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.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
Roof area measured in sq ft number of squares.
From the 1 ft 0 30 m spot you marked on the level measure upward to the rafter.
3 determine the bundles of shingles needed to cover the roof.
You will then have to get the measurement of the rake of the roof.
Use a measuring tape preferably 50 or 100 feet long and get exact ground dimensions of your house.
This roof shingle calculator requires four basic inputs.
Measure your roof accurately.
It takes 3 bundles to cover a square if you use 3 tab shingles the most common type.
How many rolls of felt will you need.
In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
To do this you need to note that one tab will be equal to 1 foot.
Roofing felt is sold by the roll.
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.
Enter your zip code.
Outside of the u s a degree angle is typically used.
Hold the end you measured from against the bottom of a rafter so it s sticking straight out horizontally and is level.
How to use roof calculator.
Divide the total footage by 100 to determine the number of squares in the roof.
Mark a length of 1 foot 0 30 m on a long level starting from one end.
When figuring the amount of shingles needed to roof a house you first convert the total square footage of the roof to squares a square represents 100 square feet of area covered by shingles.
Simply enter your roof dimensions and roof type such as gable or hip and approximate roof pitch.
Roof length measured in feet roof width measured in feet roof pitch.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
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.
Rolls of felt are 36 wide x 144 long for 15 and 72 long for 30.
The number of squares determines the amount of shingles needed.
If the existing shingles are standard 3 tab shingles you can get this measurement by taking note of the number of tabs along the eaves and ridges then determine the length in feet.
Enter appropriate roof pitch slope.
Singles are often sold in bundles with three bundles equaling one roof square.
