3
Most have 3 bundles per square. Heavy duty or architectural shingles from some manufactures have 4 bundles per square.
typically a square is three bundles (about 26 shingles per) but in some types of architectural shingles there are four bundles per square to make them easier to handle.
4 bundles for 15 year. 3 bundles for 25 year.
Some asphalt shingles come 3 bundles to a square, and some come 4 bundles to a square. Make sure you know before purchasing.
21
3 bundles per square on average. So 3.5 square is 10 bundles.
Standard fiberglass shingles come 3 bundles to the square.
3
How many bundles of 3-Tab Shingles are needed to cover 80 square feet?
9 bundles assuming std. 3 bundle/sq. shingles
If your shingles say they cover 3 bundles to a square ( 10'x10' or 100 sq. ft) then one and a half. Some thicker, heavier shingles are 4 bundles to a square so you'd need 2.
20 year = 4 to a square. 30 year = 3 to a square. Most 20 year are also 3 bundles per square