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Is Roofing Over Existing Shingles a Good Idea for Your Huntsville Home?

Replacing a roof in Huntsville, Alabama, can be expensive because it’s a complex and labor-intensive project. As such, homeowners sometimes wonder whether it’s easier and more cost-effective to put new roofing over existing shingles. Unfortunately, the answer isn’t as simple as you might think.

As a top-rated roofing company in Huntsville, Patriot Roofing understands the many questions homeowners have regarding installing a new roof with or without existing shingles. Their guide below explains why replacing shingles over existing roofing could work and when it won’t. 

Should You Install New Shingles Over Your Huntsville Home’s Old Shingles?

Adding a second layer of shingles to a roof isn’t always bad. A roof overlay costs substantially less than a tear-off roof replacement because of the lack of waste from old materials and the need for less labor.

Roof overlays are also convenient. The roofing contractor can complete the job faster than a traditional roof replacement since your roofing system will retain its underlayment. 

Despite these benefits, putting new roofing over existing shingles isn’t always a good idea for houses in Huntsville. Below are some of the problems you could encounter. 

Voided Manufacturer’s Warranty

It’s common for shingle manufacturers to void their shingle warranties for installations involving the covering of existing roofing. Manufacturers may make allowances if specific certified roofing companies do the roof overlay according to the provided specs. Still, there’s no guarantee you’ll get a warranty for the second layer of shingles. 

Reduced Shingle Lifespan

Heat can be a problem when installing more shingles onto an existing roof in Huntsville. The extra shingles can trap heat between the two layers during summer, causing the uppermost layer to degrade. In such conditions, the shingles may:

  • Lose their protective granules
  • Warp
  • Blister
  • Take the shape of the shingles underneath

These changes can shorten the lifespan of a shingle roof overlay.

Excess Moisture Under Shingles

Heat isn’t the only thing your new roofing structure could trap. The presence of any moisture under the new shingles will cause substantial damage to the roof decking and underlayment over time. The old roof will continue degrading from the water and eventually weaken the entire roofing system.

Roofing Might Not Be Up to Code

Despite the benefits of a roof overlay, they’re not always legally acceptable. Some places don’t allow for residential properties to have a second layer of shingles and those that do typically require that you meet certain conditions. Before you consider putting new roofing over your Huntsville home’s existing shingles, consult the local building codes to ensure it’s acceptable.

Maintain Your Huntsville Roof Structure’s Integrity With Help From Seasoned Professionals

Ultimately, the decision to install roofing over existing shingles is yours to make. Still, when the time comes, you’ll need quality roof repairs and shingle replacement from a reputable roofing contractor. 

Patriot Roofing has more than 15 years of experience providing outstanding roofing services to homeowners throughout Huntsville, Alabama, and the surrounding areas. The top-rated roofers at this veteran-owned company have experience addressing bad roofing installations, repairing metal roofing, and installing gutters. Schedule your consultation with Patriot Roofing today.


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