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That depends on the surface and the units, but the surface area tells us that infomation.

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Q: The number of square units needed to cover a surface?
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How many bundles of shingles to cover 1800 square feet?

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How many bundles of shingles for 3600 square feet?

100 square feet is called a 'square'. Given that, you roof is 36 'squares'. Shingle coverage for 20, 25, and 30 year shingles is 3 bundles per square. 40 and 50 year shingles are 4 bundles per square. Say the shingle you select has a coverage of 3 bundles per sqaure: the number of bundles you need would be 3 * 36, plus the amount for caps (which cover the 'peaks' and 'hips' in your roof. To estimate the amount of bundles you need for peaks, assume one bundle for every 25 feet of 'hip' or 'peak' you need to cover.


How many bundle of shingles do you need to cover a roof 20 feet by 40 feet?

at least 25 bundles With an average of 3 bundles per square(100 square feet) an 8 square roof would need 24 bundles plus 1 for cuts and shorts.


Are tornadoes bigger then hurracanes?

Nope... Hurricanes can cover hundreds of square miles - and can last for days. Tornados are generally localised over a few miles, and short-lived.


How many squares of shingles do you need to cover 1900 ft roof?

One square covers 100 square feet, so to cover 1900 square feet of roof you would need 19 squares. However, you also need "starter shingles" and "hip and ridge" shingles, plus you need to have a few extras because of waste from cutting angles. Starter shingles go around the perimeter of the roof as a bottom layer for the first course of shingles. Hip and ridge shingles go, as you might expect, on the hips and ridges. In order to know for sure the exact quantity you would need for the entire roofing job you have to measure all of these areas.