Welcome to the roof estimator page. Now that you have the dimensions of you roof and square footage we can start building your material list and estimate. We will break down the materials and itemize them into categories of how they are measured first being linear feet second square footage. This will best way to calculate your material list.
By square footage
The most expensive purchase you will be making will be your shingles. Dimensional and three tab shingles are measured by the square. Three bundles represent one square or one hundred square feet. We will use as an example roof of 20 squares. Always add 10 percent to all material list to allow for scrap or mistakes.
(20sq) x3(bundles )= 60 bundles of shingles
60 x .10 = 6
66x 19.99(bundle price) = $1319.34
Next we calculate the amount of tar paper (roofing felt) that will be needed for your roof. This is calculated off of the square footage as well. Tar paper comes in two different sizes 15lb felt which covers 4 squares and 30 lb felt which covers 2 squares per roll. We always recommend using 30 lbs felt so we will use that in on our example.
(20sq)/ 2 sq(one roll)= 10 rolls of paper will be needed.
20 x .1 = 2 sq = 1 roll
11 x $15.99 = $175.89
Total price of square footage items
$1319.34 + $175.89 = $1495.23
Linear foot materials
The next step on roof estimator is to calculate items that are based off of the linear foot. This includes items such as drip edge, ridge cap, ice and water granulate. I This is one of the easiest sets of calculations for instance if your total measurement as in our example is 20ft on each side of the eaves that gives a total of 40ft.
We will then take the forty foot and divide it by the quantity of the roll as for our example 25 ft per roll.
(40ft)/25ft = 1.6 rolls which we will round to two rolls. This will also cover our 10 percent for extra materials.
Drip edge follows a similar method as in our example we have 20 ft on each eave and 10 ft to each peak giving us 80 ft of drip edge. Drip edge comes in 10 ft sections.
(80ft)/( 10ft) 8 pieces needed we will grab 9 just in case to cover our ten percent margin.
We will use the same formula for starter strip which comes in 100ft bundles or 33 ft rolls. We recommended the roll out adhesive personally.
As for our example take (40ft) / (33ft )=1.2 rolls or since you cannot purchase quarter rolls you will need two. If you choose the 100ft break away starter you would only need one bundle.
Your final material will be nails you average 18-20 squares per box of roofing nails.
Now that you have your quantities in front of you it is time to make a list. Write down all of your materials including your additional ten percent on sheet of paper and start calling your local lumber yards for prices on materials. Often you take your list into your local lumber yard and they will print you out a quote. Never limit yourself to one supplier call around and find the best deal try to get free delivery or ask about the cost of roof top delivery. As always thanks for visiting the roof estimate page and good luck on your project.
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