The Advantages And Disadvantages of Including a Layer of Roofing Shingles

House owners often wonder whether it's cost-effective to include one more layer of roof shingles instead than tearing off the old ones. Positioning a second layer traps moisture, which can considerably reduce the life-span of the roof shingles, eventually setting you back much more in the lengthy run. While adding another layer could appear more affordable upfront, the potential damage and the decreased roofing system life might make it less of a deal than it seems.

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