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Can you Reroof over old shingles?

The decision to reroof your home is a significant one, often prompted by the wear and tear of your existing roof. One common question that arises during this process is whether it’s possible to reroof over old shingles. In this article, we will explore the pros and cons of reroofing over existing shingles, helping you make an informed decision about the best approach for your home.

Pros of Reroofing Over Old Shingles:

  1. Cost-Effective: Reroofing over old shingles can be a more cost-effective option compared to a complete tear-off. The labor involved in removing the existing shingles is eliminated, saving you both time and money.
  2. Time-Efficient: Reroofing over existing shingles is generally quicker than a full tear-off. This means less disruption to your daily life, and the new roof can be installed in a shorter timeframe.
  3. Less Waste: Reroofing generates less waste since the old shingles remain in place. This can be an environmentally friendly option, as it reduces the amount of material sent to landfills.
  4. Additional Insulation: Layering with new shingles can provide an additional layer of insulation, improving energy efficiency and potentially reducing heating and cooling costs.

Cons of Reroofing Over Old Shingles:

  1. Weight Considerations: Layering new shingles adds weight to the roof. It’s crucial to ensure that the structure of your home can support the additional load. Consulting with a structural engineer or roofing professional is advisable.
  2. Hidden Issues: Reroofing over old shingles may hide underlying problems, such as water damage or deteriorating decking. A thorough inspection before the reroofing process is essential to identify and address any issues.
  3. Reduced Roof Lifespan: Reroofing over old shingles may not extend the lifespan of your roof as much as a complete tear-off and replacement. The new shingles are still affected by the conditions of the old ones.
  4. Aesthetic Concerns: The appearance of the roof may be compromised due to uneven surfaces caused by the existing shingles. This can impact the visual appeal of your home.


Reroofing over old shingles can be a viable option under the right circumstances, offering cost and time savings. However, it’s crucial to weigh the pros and cons carefully. If your existing roof has significant damage, a complete tear-off and replacement may be the more prudent choice to address underlying issues and maximize the lifespan of your new roof.

Before making a decision, consult with a professional roofing contractor who can assess the condition of your current roof and provide personalized advice based on your specific situation. Ultimately, whether you choose to reroof over old shingles or opt for a complete replacement, investing in the expertise of a qualified roofer ensures a durable and reliable roofing solution for your home.

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