Q:

# How many bundles of shingles are there in a square?

A:

It typically takes three bundles of standard three-tab asphalt shingles to cover one square on a roof. Therefore, a 40-square roof would require approximately 120 bundles of shingles. A "roof square" is equal to 100 square feet, so each bundle covers roughly 33 1/3 square feet.

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The Owens Corning website notes that it is common to add 10 percent to an estimate for shingles to allow for trimming. If shingles get trimmed at the edge, bottom or top of a roof, three bundles would cover less than one square. Thus, a 40-square job would actually dictate 132 bundles, including an extra 12 bundles for trimming allowance.

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## Related Questions

• A:

Timberline HD shingles have replaced Timberline Prestique 30 shingles and weigh 220 pounds per square. Timberline Prestique 40 shingles weighed 260 to 270 pounds per square and are no longer being produced. Timberline Ultra HD Shingles have replaced Timberline Prestique Lifetime shingles and weigh 360 pounds per square.

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• A:

Masonry jobs typically require 6.3 standard bricks per square foot, but the likelihood that some break makes seven bricks per square foot a safer estimate. Plan to use seven bags of mortar for each 1,000 bricks.

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• A:

In the building trade, the rule of thumb is to have 60 bricks for each square meter of surface. A typical brick measures 215 x 102.5 x 65mm. This is enough for one square meter of a "half brick" or "single brick" wall, where the bricks are laid horizontally. The width of the wall is the same as the width of the brick.