Asphalt shingles how many squares

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.

This method is fast, and you can usually complete it from the ground. The caveat is you can use this method only on roofs sheathed with 4x8ft.

Each of these panels is 32 sq. Another way to tally them up is by estimating the relative size of ripped and crosscut sheets along the edges of the roof to the size of a full sheet. Diagonally cut sheets along hips and valleys are a bit more of a challenge to size, but typically you can assign them a relative size, like half or quarter sheet, and it will be close enough.

Calculating the number of bundles, you need is simple if you are using shingles that come three bundles to a square.

Each bundle covers To start, measure the length of the eaves of each roof plane, either directly from on top of the roof or from the ground by measuring the length of the house and adding in the width of the rake overhangs, if any. 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. For high wind areas or when shingles are being applied to a mansard, six nails per shingle are required, or nails per square. This is based on 80 shingles per square. Other styles of shingles may require more or fewer nails per shingle and may have more or less than 80 shingles per square.

Refer to the application instructions on your shingle wrappers for the correct nailing pattern. Always check what local building code dictates for fasteners. Ask your dealer for the correct amount of nails for your size roof, in the length you specify. Getting the color and shape of shingle you always wanted is a great way to express your individual personality and add real value.

Owens Corning. Planning Your Roof. Roof Damage. Hiring a Contractor. We recommend getting free roofing estimates to understand material and labor costs and identify other project complexities that could affect the cost. There are some other factors to consider when installing a new roof. Learn about the costs of installing a new roof.

Many localities require permits and inspections for roofing projects; check with your local inspections office and consult local building codes for more information on the requirements. Also, consider that removing old materials may be a good idea and will require disposing of a large amount of waste. Plan ahead for this by ordering a dumpster for the project. You are here.

Dimensions measured from the ground Length:. Roof Pitch:. Optionally enter the price per square. Roofing Material Estimate:.

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