simple roofing question

Old 08-15-15, 01:54 PM
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simple roofing question

How do you do the calculation on how many bundles needed for roofing project?
Does each bundle cover so many square feet?
Old 08-15-15, 02:21 PM
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A " roofing square" is 100 square feet. Composition shingles (asphalt or fiberglass) come in bundles that cover 1/3 square.

There are 21 shingles in a bundle and that will cover approx 32 sq. feet.
Old 08-15-15, 02:25 PM
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never heard the term roofing square. But yes just length x's width gives you square ft. And each bundle covers about 32 sqft.
Old 08-15-15, 02:57 PM
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Some "square" of shingles require 4 bundles. You really need to find out which shingle you are using and find how many bundles per square for standard exposure. Then multiply the total number of squares by the number of bundles per square.
Old 08-15-15, 05:38 PM
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Then add 10% for waste.
Plus cap, starter strip, drip cap, under layment.
Old 08-15-15, 10:42 PM
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And don't forget to use nails, and not staples, for attaching the shingles.
Old 08-16-15, 01:55 AM
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As a last resort :-) read the label. ALL the info you need is on the package (even, usually, how many squares). You can also find all this info online on the mfr's website for every model of shingle they make . . . Including such fun facts as use roofing nails not staples.

Last edited by suobs; 08-16-15 at 03:29 AM.
Old 08-16-15, 03:40 AM
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As in posts 6 & 7 read the instructions. Mine required 5 nails per shingle to validate my warranty, where common installation the roofers will only use 4. Wifey listened all day for 5 hits with the nailer per shingle to make sure they were doing it right.

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