Can You Put New Shingles Over Old?

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Can You Put New Shingles Over Old?

There are many things that can damage a roof, from age to poor installation. A damaged roof can allow water to leak into your home, causing interior water damage. Further, worn shingles are not able to insulate your home from the temperature outside. This can lead to higher heating and cooling bills, drafts, and uneven temperatures inside your home.

An asphalt shingled roof lasts for about 20 years on average before it needs replacement. When looking to replace an old roof, it’s tempting to rip off the old shingles. However, it is possible to install roofing over existing shingles, known as re-roofing. Understanding what reroofing entails and how it benefits your home can help you decide if it is the right choice for your home. 

Benefits of Reroofing Over Existing Shingles

  • Affordable: A leading advantage of choosing to reroof over installing a brand new roof is the associated cost. Since you won’t be removing the current roof, there is less labor involved. You also won’t have to worry about disposal, which can be an extra cost for larger roofs. 
  • Speed: In a related vein, roofers can complete reroofing faster than they can install a new roof since they don’t have to remove the old one. This limits the disruption and construction of your property. 
  • Extra Protection: Leaving the old layer of shingles on your roof can protect your home, especially if the old roof has not sprung a leak yet. The extra material makes it much harder for water to enter your home and can provide added insulation as well. 

When You Shouldn’t Install Roofing Over Existing Shingles

  • Two Layers Already: If you’ve installed a second layer of shingles over an existing roof, you shouldn’t do so again. Adding several layers of shingles on your roof can violate local building codes, and can place too much weight on your roof. You should always check local regulations before proceeding with reroofing. 
  • Leaks: If your current roof is leaking water, you shouldn’t install a new layer of shingles to cover it up. Instead, you need to remove your old roof so that you can find the source of the leak. You may also need to repair water damage to your attic and roofing trusses, depending on the severity of the leak. 
  • Warranty Violations: You should also check the warranties that come with the shingles that you choose to install. Some manufacturers will not honor a warranty on shingles that you install over existing shingles. This means that they will not reimburse you in the event of roofing damage, shingle failure or leaks. 

Update Your Roof

If you have any questions about choosing between reroofing over existing shingles and roofing replacement, or any other concerns about your home’s roof, feel free to contact us. Our team of experienced professionals can help you get a quote and figure out the best course of action for your roof. 

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