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Pros and Cons of a Roof Overlay – A Comprehensive Guide by Roof Shield

Check out the articles below to get educated by the experts at Roof Shield.

Pros and Cons of a Roof Overlay – A Comprehensive Guide by Roof Shield

Choosing the right roofing solution is vital for the longevity and performance of your roof. At Roof Shield, we’re dedicated to helping you make informed decisions. In this post, we’ll explore the pros and cons of a roof overlay and introduce Roof Reboot, our innovative asphalt shingle rejuvenator that offers an affordable alternative.

What is a Roof Overlay?

A roof overlay is the practice of adding a new layer of shingles over an existing roof. This method may extend the roof’s lifespan and offers a short-term solution, but it comes with both advantages and disadvantages.

The Cons of a Roof Overlay

If you’re considering a roof overlay, here’s a detailed look at the potential downsides:

Warranty Issues

Warranty challenges arise with roof overlays since the original installation quality and the condition of the underlying deck are uncertain. This makes it difficult to provide guarantees.

Cuts the Roof Lifespan

Additional shingles can cause heat retention, which may shorten the new roof’s lifespan. This lack of ventilation can lead to a quicker deterioration of materials.

Hidden Costs

Roof overlays might have hidden costs as leaks become harder to locate and repair. Additionally, future replacement costs might be higher due to the need to remove multiple layers.

Unable to Inspect the Decking

A roof overlay hinders inspection of the underlying decking, which is crucial for quality installation. Without proper inspection, underlying issues may go unnoticed.

Cannot Layer Architectural Shingle

Overlaying is not suitable for architectural shingles, as they require flat surfaces. This limitation restricts the use of certain materials and designs.

Adds Height and Weight

An overlay adds significant weight to the structure, potentially harming the decking and framing. This additional weight may also affect the overall aesthetic of the home.

The Pros of a Roof Overlay

Despite the challenges, there are some advantages to a roof overlay:

Cost Savings

An overlay might save you 20 – 40 percent compared to a full replacement. These savings come mainly from reduced removal and disposal costs.

Less Mess

Leaving the original shingles on reduces cleanup and shortens construction time. It also minimizes the disruption to your daily life.

Roof Reboot: A Third Alternative by Roof Shield

As you can see, we don’t recommend overlaying onto an existing roof as the potential disadvantages easily out weigh the advantages. However, at Roof Shield, we offer a third option, asphalt shingle rejuvenation. A single treatment of Roof Reboot, our cutting-edge rejuvenator:

Restores Performance

Roof Reboot penetrates the shingles, replenishes lost oils, and revives them to their original functionality. This restoration process enhances the roof’s overall performance.


Roof Reboot by Roof Shield provides an incredibly budget-friendly solution at only 10 percent of the cost of a new roof. This affordability does not compromise quality or effectiveness.

Environmentally Friendly

Roof Reboot is not only a cost-effective solution but also an environmentally sustainable one. By rejuvenating existing materials, it reduces waste and supports greener living.


Roofing decisions should be made with careful consideration. While roof overlays have their place, they might not be the best option for every situation. Our unique solution, Roof Reboot, offers an innovative, affordable, and environmentally responsible alternative to roof replacement. Contact Roof Shield to explore the best roofing solutions for your home, and follow us on social media for regular insights and updates on roofing care.

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