3 bundles per square.
How to figure how many shingles i need for roof.
This means you would need 240 squares of shingles to cover that roof.
So in the gable roof example above you need 240 squares of underlayment.
This overhand measurement will need to be added to the measurement of the building.
Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.
For example you will need to figure out the exact number of shingles required to cover the entire roof area.
Your roof line is not going to be the same as the square footage in your home.
Compute the area of the whole roof and determine the number of bundles.
Also have a couple of bundles spare on hand to cover wind damage etc.
100 sq ft 21 shingles per bundle.
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Be sure to add a couple of bundles for double first row and capping.
You will need to measure the length and height of you roof to calculate how many bundles you need to purchase.
This free roofing calculator estimates the area of a roof and the amount of materials required to replace or build said roof.
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.
33 square feet per bundle 100 square feet per square 4 nails per shingle.
Singles are often sold in bundles with three bundles equaling one roof square.
Of the rest of the roof.
A square represents 100 square feet of area covered by shingles.
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.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a 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.
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.
At this point you will also need to estimate or measure the overhang if you have one.
To calculate the size of the roof you need to measure the size of the roof as if it were flat account for roof pitch calculate square footage and finally determine how many squares of material are required for the roof the calculator above can handle all of this simply enter the length width and pitch and it will determine the size of the roof in squares.
If you have valleys and or dormers you will need to measure and calculate those by adding their sq.
