They are packaged in plastic or paper wrapped bundles designed to be light enough for a person to carry, so heavier shingles require more bundles per square. Typically, there are three bundles to a square; this applies to most three-tab strip shingles and some lightweight laminated shingles. Heavier three-tabbed shingles and laminated shingles may require 4 or 5 bundles to cover a square.
There are 29 standard-sized shingles 12 in. You can measure a new or freshly stripped roof in two ways: the measurement method and the sheet-count method. When you have a bundle or square count for the main roof area, you will then add additional shingles to account for waste, starter shingles, and extra shingles for hip and ridge caps.
If all the roof planes are rectangles, you simply need to multiply the length times the width of each plane to get the square footage; then you will add up the square footage of each plane. Many times, the roof may be too steep to walk on without safety equipment, so you will have to do the estimate from the ground.
If this is the case, measure the length of the building at the ground level and estimate any rake-edge overhangs. Next, from a ladder, use a stiff, wide blade measuring tape to measure from the edge of the eaves to the ridge. If the sheathing is still exposed you can use the sheet-count method, which is sometimes preferred more than the measurement method.
How much does a sump pump installation cost? How much does a new AC unit cost? The top 8 price factors explained. View all articles. Get a price for a new roof Start here. Login Register. How to measure a roof with our roofing shingle calculator. By Chris Gennone May 4, Learn about roofing. More complicated roofs will have a higher waste factor because there are usually more cut shingles around corners, walls, and edges. It is okay to have a few shingles left over.
They can be saved in case there is roof damage later or if repairs need to be done in the future. So for the 24 square roof example, you would want to add 2.
If you are also installing underlayment, then you would need the same amount of underlayment to cover the roof deck. So in the sq.
The roll size depends on the type of underlayment product. Synthetic underlayment comes in 10 square rolls, while regular 15 felt comes in 4 square rolls. So for the 24 square roof example, you would need 2. Finally, if you have any questions about your estimate, ask a roofing contractor in your area. Most will be happy to give you a free estimate. Calculate the roof length by measuring the exterior walls plus the overhang for the length of the house parallel to the ridge.
Next, throw a rope over the ridge and mark it where it meets each eave. This will give the width dimension to use in figuring your area.
This should be done on each roof section containing a horizontal ridge. Determine the roof area by using a mathematical formula that accounts for the roof length, total span, and roof pitch :.
Generally, you should use four nails per shingle in the field of the roof, and 5 nails per starter shingle. For regular three-tab shingles , this would require nails per square for field shingles. Multiply the number of starter shingles required by 5 to determine the number of nails required to fasten starter course. Most will be happy to give you a free estimate. For a listing of roofing contractors in your area, use our Find a Roofing Professional locator tool. You will also need to know the slope of your deck.
In order to determine this, measure the vertical rise of your deck in inches over a 12" horizontal distance. If this rise is 4", then your roof slope is 4 in Roof slopes are always expressed with the vertical rise mentioned first and the horizontal run 12" mentioned second. To measure a steep roof, you will have to use an alternate method.
To calculate the roof length, measure the exterior walls plus the overhang for the length of the house parallel to the ridge. Next, throw a rope over the ridge and mark it on each eave. This will give the width dimension to use in figuring your area. This should be done on each roof section containing a horizontal ridge.
You will also need to determine the amount of nails you'll need. Generally, you should use four nails per shingle. For regular three-tab shingles, this would require nails per square.
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