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Question DetailsAsked on 10/31/2017

Roofing:What is the cost of a 1,000sq ft 4/12 pitch nail over with two gables. Has only one layer.

Roofing: What is the cost of a 1,000sq ft 4/12 pitch nail over with two gables no vally's. Has only one layer.

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Composition asphalt shingles reroof, can commonly run from around $3-5/SF without tearoff (which can vary from $0.25-1.50 extra per SF depending on contractor and a lot of other factors) with economy products, as high as $5-10/SF with higher-end products, steep roof (over about 6:12 pitch), or very high cost area, or an area with very high disposal fees - or combination thereof.

Around $5/SF is commonly seen as the run-of-the-mill average cost range for reroofing INCLUDING removing and disposing of one layer of shingles plus water barrier tearoff - so in a normal cost area your cost for a roof-over only should not be more than that unless you use pretty high-end shingles, which would be abnormal for a roof-over - not only because most people who do roof-overs are doing it to save money so do not go with higher-end shingles or water barrier, but also because manufacturer warranties will generally be void or useless (unable to prove it was not the overlaying that caused the problem) with overlays so why buy a pricier shingle or pay for the warranty upgrade in that case.

Be aware that a roof-over presumes that the flashing and water barrier under the original roof is not only acceptable now, but is also going to be functional for another 20-40 years - probably a rash assumption in most cases as that would be calling for 40-80 year life on those elements - especially as the water barrier is likely to be tarpaper or an early synthetic which would not be expected to exceed 20-30 year life. I do not recommend roofovers, and especially not in areas potentially subject to blow-under rain or winter ice damming.

You can find a lot of previous questions with answers on roofing issue, ballpark cost, brandname thoughts, etc in the Home > Roofing link, under Browse Projects, at lower left.

Answered 3 years ago by LCD

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