So in the gable roof example above you need 240 squares of underlayment.
How to figure how many shingles i need for roof.
33 square feet per bundle 100 square feet per square 4 nails per shingle.
An important part of any roofing repair or replacement project is being able to accurately calculate the quantity of roofing materials required to finish the job.
To properly calculate how many bundles of shingles are needed to roof your home you need to calculate the total square footage of the roof and convert it to squares.
Once you know this number you can estimate the final price of the materials.
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.
You will need to measure the length and height of you roof to calculate how many bundles you need to purchase.
100 sq ft 21 shingles per bundle.
Your roof line is not going to be the same as the square footage in your home.
A square represents 100 square feet of area covered by shingles.
At this point you will also need to estimate or measure the overhang if you have one.
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.
This free roofing calculator estimates the area of a roof and the amount of materials required to replace or build said roof.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
Be sure to add a couple of bundles for double first row and capping.
Compute the area of the whole roof and determine the number of bundles.
For a new roof you will also need the same amount of underlayment.
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.
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.
Also have a couple of bundles spare on hand to cover wind damage etc.
This overhand measurement will need to be added to the measurement of the building.
Of the rest of the roof.
The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.
Singles are often sold in bundles with three bundles equaling one roof square.
Explore a number of housing related calculators as well as hundreds of other calculators covering topics such as finance math health fitness and more.
3 bundles per square.
For example you will need to figure out the exact number of shingles required to cover the entire roof area.
