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Old 04-05-2004, 04:02 PM
5window 5window is offline
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How much overlap you need really depends on the slope of your roof. Most roofing material will have the manufacturer's recommendations printed on the paper that wraps the roll together. "Fifteen pound" tar paper is really just an underlayment and should not be used as finish roofing. It just won't hold up. There are roll roofing products made to be used as a finish layer. Most of these have a coating-chips and bits-attached to about half the width, making the required overlap easy to gauge. The lines on the tar paper are generally guides for applying shingles on top of them, but may help you gauge your overlap. Shingles come rated in pounds per square (100 sq ft coverage), usually 3 bundles of shingles per square. The higher the weight, usually the longer the guarantee. The best ones are now 40 year. Shingle overlap, drip edge requirements etc., are also printed on the shingle package, or on a fact sheet available from the dealer. You might also look into metal roofing. It comes in widths that typically cover 3 feet and can be ordered to fit your roof-maybe even 30' long. Goes on fast and lasts 2x what shingles do. Again, what kind of roof material you do is related to the slope of your roof. And your budget. But a tarpaper roof won't last a year.
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