How to calculate the number of shingles you need?
Question:
Answers:
The surface area of a roof is measured in squares of shingles. Each square covers 100 square feet.
However, when you buy them, shingles are usually priced per bundle. In most cases, 3 bundles = 1 square.
To calculate the number of bundles needed for a roof, measure the roof’s square footage (length x width).
Divide that number by 100 to get the number of squares needed. Use the equivalency above (3 bundles per
square) to determine the number of bundles needed to shingle the roof.
im sorry, but that is not a real question
This article should help.
http://www.ehow.com/how_2002706_install-...
try this site all you do is put the numbers in
You must measure the area (length times width) to ge the square footage of the area. Then call the hardware store and tell them what your square footage is; they have formulas for figuring what you'll need depending on what type shingles you buy.
A bundle of shingles will cover 33 1/3 sq feet. That's approximately the size of a full sheet of plywood. I hope that gets you going in the right direction.
Roofing shingles are sole as "squares". Depending on the weight of the shingles, there may be 3 or 4 bundles of shingles which comprise a "square" (a square is 100 square feet). You'll need to measure the roof - length and width, multiply the length X width to come up with an approximate square footage of your roof area. You also need to figure on installing cap shingles (unless you have a ridge vent which will not accept the capping). For example, it your roof area was 1700 square feet, and you needed to install the cap shingles, figure on 18 squares of shingles. This will aloow for cut-offs etc. as well as the capping. Most new roofs installed now are archetectural grade 300 lb. dimensional shingles, which are usually sold as 3 bundles to the square. Make sure that when you purchase your new shingles, they are all from the same manufacturer's "batch lot". There can be minor color differentiations between shingles with different batch lots.
Add all of the roof flats areas together,( areas are L*W). Then add 10% for cut off. Then add starter shingles. Then add roof cap,(you can cut this out of standard shingles but not usually out of heavy weight dimensional shingles). You should probably redo the D edges as well.
They are right in how to measure a roof. Length x height = square feet. There are 100 square feet in 1 roofing square. You will need to add waste to this equation. If your roof is just up and over 10% should do. If your roof is cut up you may have to add 15% to your total. You will also need starter shingles. Starter shingles go along the bottom edges of your roof. You will get 70 lineal feet out of each bundle of starter shingles, the go on first. If you are going to use a shingle over ridge vent or not you will need cap shingles for the ridge. If you are using a 3-tab shingle you can use the same for the ridge. If you are using a dimensional shingle you will need what is called a hip & ridge shingle.
Good Luck
go with kirbyt,,boy knows what he talks about,,should get the 10
CLIMB UP ON THE ROOF AND COUNT THEM ONE BY ONE
First, look at the box of shingles and see how many are in it, and how much coverage the box provides. Then:
(coverage sq.ft) / (number of shingles) = (coverage per shingle)
Now take your roof measurements
(Length)(Width)= (Area of sq ft)
(Area of sq ft) / (Coverage per shingle) = (How many shingles for this area)
Since you have to buy shingles by the box you should just figure out how many boxes you need.
(Area of sq ft) / (coverage per box) = (Number of boxes required)
Cost = (price per box)(Number of boxes required)
to find number of shingle is measure for each 10foot x 10 foot will take three packs of shingles or one square
Measure the actual roof surface. Add everything up and this will give you square feet. Divide by 100, this will give you "squares". Shingles are sold in squares. If you are using asphalt impregnated shingles, three bundles equal one square. All you would need to know is how many squares you need and the salesman can help you.
I would buy a bundle or three extra depending on how large a roof you have. You may also want to buy ridge cap shingles, it's easier than making your own.
Square footage is definately what you need... but if you measure your homes length and width you need to also allow for pitch of roof and length of overhangs.. If you can get on the roof it would be easier. one tab of a shingle is 12 inches so if you have 45 tabs(count cut ones as full) you have 45 feet and for gutter to peak every 2 courses of shingles you see are equal to 10 inches (5 inch coverage per course) so if you have 34 courses from gutter to peak you have about 15 foot and some change allow an extra foot to both lenth and width to allow for starter course(which is unseen) and ridge caps, also consider using a ridge vent to allow your attic to circulate air easier!
More Related Questions & Answers...