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Should You Add a Second Layer?

Mar 31, 2023

Results of a Second Layer

It is generally not recommended to install two layers of roofing shingles on a roof. There are a few reasons for this:
  1. Weight: Two layers of shingles will add extra weight to your roof. This can put stress on your roof's structure and may lead to damage or even collapse over time.
  2. Durability: Adding a second layer of shingles can reduce the lifespan of your roof. The bottom layer can trap heat and moisture, causing the shingles to degrade faster.
  3. Appearance: Two layers of shingles can make your roof look uneven and unattractive.
  4. Warranty: Most roofing manufacturers will not warranty a roof that has two layers of shingles installed.
If your roof already has two layers of shingles, it is best to remove both layers and install a new layer of shingles. This will ensure that your roof is structurally sound, durable, and looks good.
See picture above of the plywood that was under a 2 layer roof less than 10 years old.

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