A Standard roll of 30lb felt will cover 2 square or 200 sq ft
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25 will cover it. I'd get 28.
You'll need 50*28 = 1400 square feet
It depends on the size of plywood so there cant be a exact answer. About 120 piece's.
To find the sq. ft of a roof you have to measure the length and the width and multiply those figures together. Then you divide that figure by 100 and it will tell you how many squares of shingles it will take to cover it.
You need to estimate the size of the roof in square feet.A bundle of shingles will cover 33 square feet, so divide the square footage of the roof by 30and that's how many bundles of shingles you'll need.The extra 10% will end up getting used as starters and the cap.Shingling a roof isn't difficult, complete directions are printed on every bundle.But if you've never shingled a roof before you might want to pick up a couple of extra bundles.You can always return them after.