Thirty-pound felt just isn't what it used to be — and in wet and windy conditions it was never that great to begin with. If your weather forecast looks a little iffy and your budget allows it, try one of the new synthetic underlayments. Grace promises that its Tri-Flex 30 can be left exposed for up to six months, that it has much better tear and slip resistance than 30-pound felt, and that it won't wrinkle when wet. A 10-square roll weighs approximately 30 pounds and sells for about $135. Grace, 866/333-3726, www.graceconstruction.com

Like other synthetic roofing underlayments, Titanium UDL weighs much less than roofing felt and has better tear and water resistance. Unlike some other synthetic underlayments, though, it's light gray instead of black, which should keep the roof surface — and you — a little more comfortable in sunny weather. Plus the material's textured surface...

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