Is It a Good Idea to Put New Shingles Over Old Shingles?

March 7, 2025

When it comes time to replace your roof, you may wonder if you can save time and money by installing new shingles over the existing ones. While this method, known as roof overlay, is an option, it’s not always the best choice. Before making a decision, it’s important to weigh the pros and cons to determine if layering new shingles over old ones is the right move for your home.

Pros of Installing New Shingles Over Old Ones

Installing new shingles over existing ones can offer some advantages, making the process quicker and more cost-effective. Here are a few benefits to consider:

  • Cost Savings – Since there’s no need to remove the old shingles, you save on labor and disposal costs.
  • Faster Installation – Without the tear-off process, the roofing project can be completed more quickly.
  • Less Mess – No need to deal with the debris from stripping off the old shingles, which reduces cleanup time.

While these benefits may sound appealing, they often come with hidden drawbacks.

Cons of Adding New Shingles Over Old Ones

Although a roof overlay may seem like a convenient option, there are several potential downsides that could lead to more significant issues in the long run. Consider the following drawbacks:

  • Potential Structural Issues – Adding another layer of shingles increases the weight on your roof. If your home’s structure isn’t designed to handle the extra weight, it could lead to problems down the road.
  • Hidden Damage – A roof overlay doesn’t allow for a full inspection of the underlying deck. If there’s existing rot, mold, or leaks, those issues will remain hidden and could worsen over time.
  • Shorter Lifespan – A second layer of shingles won’t last as long as a full roof replacement. Heat can get trapped between the layers, leading to premature aging and curling.
  • More Expensive Future Repairs – If you ever need to replace your roof again, both layers will have to be removed, increasing labor costs. Some areas also limit the number of shingle layers allowed, meaning you may have to tear off everything sooner than expected.

When Is a Roof Overlay a Good Option?

A second layer of shingles may be an option only if:

  • Your existing roof is in good condition, without leaks or major damage.
  • Your home’s structure can support the extra weight.
  • Local building codes allow for a second layer of shingles.

Final Recommendation: Is It Worth It?

While installing new shingles over old ones might save you money upfront, it often leads to higher long-term costs due to hidden damage and reduced roof lifespan. A full roof replacement ensures a clean slate, allowing professionals to inspect and repair any underlying issues before installing a new, durable roofing system.

Need Roofing Advice? Call Bartlett Contracting, LLC

At Bartlett Contracting, LLC, we believe in providing homeowners with the best roofing solutions to ensure long-term protection and value. If you’re considering a roof replacement, contact Bartlett Contracting, LLC for a free consultation and estimate today.

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