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Would you recommend re-roofing over a single layer of asphalt shingles?

In most cases
In some cases
Not Sure
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Question: Would you recommend re-roofing over a single layer of asphalt shingles?
Top Answer (44% of 45 votes): In some cases.

Answer: In some cases
Explanation: LEARN MORE:
4 Square Roofing
Answer: In some cases
Explanation: The short answer is yes, you can lay new roof shingles over top of the old ones (with asphalt), but there are other factors to take into consideration. Placing old shingles over new ones is only possible with asphalt shingles, also known as composition shingles. You cannot place a new layer over top of slate or wood, and you should definitely never mix materials like laying asphalt shingles over cedar shakes. Perhaps the most important rule for laying new shingles over top of old ones is that the old roofing has to be in pretty good condition. If you are laying new roofing shingles over an existing roofing system with a ton of leaks or damage, you aren’t doing yourself any good. It might seem like an obvious benefit to having multiple layers of protection on your roof, but that is not automatically true. As a matter of fact, having multiple layers of shingles does not mean that your roof is any more waterproof than it may have been before. Also, having multiple roofing layers can create problems all its own. The biggest reason to lay down new shingles over existing ones comes down to a simple matter of convenience and cost. Keeping the old shingles allows you to skip the messy labor and disposal costs of a tear-off.
Top Shield Roofing
Answer: Never
Explanation: we don't cut corners
Interstate Roofing
Answer: Never
Explanation: Of 800 installations, I have only done three shingle over projects.
Answer: Never
Explanation: As a MasterElite installer we cannot roof over existing shingles and for the cost and longevity it's more cost effective to install a new roof entirely.
Aci Exteriors LLC
Answer: In some cases
Driggz Roofing & Restoration LLc
Answer: In most cases
Explanation: in most cases I would always roof over a single layer unless there is dryrott issues with the sheeting under roof
all-phaze handyman & TV install
Answer: Never
Explanation: We do not recommend doing so. While it may seem cheaper to do so, in the long run, it can cost more to so. The weakest point in your roof is the underlayment material. Most roofs are done with felt paper underlayment which absorbs moisture and begins to fail after about 10 years. If the roof is worn out and needs replacing, then the underlayment is also bad and will offer no protection. The worn out shingles now become your underlayment, a job that they were not designed to perform. At Allegiant Roofing we will always recommend removing all worn out materials and installing new materials to provide the longest life roof possible.
Allegiant Roofing, LLC
Answer: In most cases
Explanation: Code says you are allowed to
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