The Pros and Disadvantages of Including a Layer of Roofing Shingles

Homeowners frequently question whether it's economical to add an additional layer of shingles rather than tearing off the old ones. Putting a second layer traps moisture, which can dramatically reduce the life expectancy of the roof shingles, inevitably costing much more in the lengthy run. While adding another layer might appear cheaper upfront, the potential damages and the reduced roof covering life may make it much less of a bargain than it seems.

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