Can You Put New Roofing Shingles Over Existing Shingles?

If your roof is showing signs of wear, you may be wondering whether you can simply install new shingles over the old ones. This process, called re-roofing or a roof overlay, is a common question among homeowners looking to save time and money. While it may seem like a quick fix, layering shingles comes with both benefits and drawbacks. Here’s what Roofing Georgia wants you to know before making a decision.

Yes, You Can—Sometimes

In many cases, it is possible to install a new layer of asphalt shingles over an existing layer. However, not all roofs are suitable for this method. Building codes in most areas, including North Georgia, typically allow only two layers of shingles. If your roof already has two layers, a full tear-off is required by law.

The existing roof must also be in decent condition. If there are soft spots, sagging, water damage, or uneven surfaces, a roof overlay isn’t advisable. Roofing Georgia conducts a full inspection to ensure your home is a candidate before proceeding.

Advantages of Installing Shingles Over Shingles

The biggest advantage of a roof overlay is cost savings. Because you don’t have to pay for labor and disposal associated with removing the old roof, the project becomes more affordable upfront. The installation also tends to be faster, since it skips the tear-off phase.

Additionally, less mess and disruption to your landscaping or yard make the process more convenient for some homeowners. If the existing roof is in solid shape, a new layer of shingles can add years of protection without a full replacement.

Drawbacks and Long-Term Considerations

While re-roofing may save money in the short term, it’s not always the best long-term solution. Covering old shingles means any hidden damage beneath the surface remains undetected. Moisture, rot, or ventilation issues can go unnoticed until they become major problems.

Adding a second layer also adds weight to your roof structure. In some cases, especially on older homes, this can put stress on rafters and decking, increasing the risk of sagging.

Another issue is reduced lifespan. Shingles installed over existing ones tend to wear out faster due to heat buildup and uneven surfaces. This can mean replacing the roof sooner than if you had done a full tear-off and started fresh.

Finally, roofing over an existing layer can limit your warranty options. Many manufacturers only honor warranties on shingles installed on a clean, new roof deck.

What Roofing Georgia Recommends

At Roofing Georgia, we assess each home on a case-by-case basis. If your current roof is in solid condition and only has one layer, re-roofing may be a viable temporary solution. However, we often recommend a full tear-off for better long-term performance, durability, and peace of mind. A new roof deck ensures a clean slate, optimal ventilation, and full manufacturer warranty coverage.

Conclusion

Yes, you can put new shingles over existing ones—but only under the right conditions. A professional inspection is key to determining whether this method is suitable for your home. Roofing Georgia is here to provide expert advice and quality workmanship, whether you choose a roof overlay or a full replacement. 

Contact us today to schedule a free consultation and find out what’s best for your home.