Repairing My Roof

Shingles And Your Roof: Is It Okay To Layer Shingles?

There are numerous home improvement projects that have homeowners wondering if they can legally and logically do something or not. While a certain project may be possible, it doesn't mean that you should do it. This is the case with adding a new layer of shingles to your roofing. Read on to learn more.

Problems You May Run Into When Layering Shingles

As a general rule, you can layer the shingles on your roof. The city where you live will likely have their own set of rules, but most locations will allow for no more than two layers of shingles. Although this may upset you, there is a reason for this. There are a number of problems that can be linked to layered shingles, including these:

  • Shingles Not Attaching Properly - If you try to place new shingles over old, curling shingles, then the new shingles will not lie flat. This will result in an increased risk of moisture seeping below the shingles and into the attic. This will cause structural damage to the roof deck as well as interior damage to your home.

  • Unnecessary Rotting - Premature rotting of the roof deck is also common. This is because it is easier for moisture to become trapped underneath the shingles since there is more than one layer.

  • Bowing Roof - Due to the fact that two layers weighs more than one layer, the roof decking as well as the joists may bow. This will typically cause a ripple effect in your roof. Under most cases, the roof will need to be torn off, the joists and decking need to be re-braced and the roofing material replaced.

  • More Expensive Roof Project - When you have more than one layer of shingles on your roof, it means that all layers will need to be removed in the event that you have your roof replaced. This may result in additional costs because of the additional work that the roofers will have to put into the project.

  • Inability to Properly Inspect the Underlying Roof - If you choose to add a layer of shingles rather than remove the old layer, you will be unable to fully inspect the roof decking for any signs of rot. Therefore, you won't be able to make the necessary repairs. Instead, the damage will sit there and continue to worsen over time, which will result in more damage and more costly repairs in the future.

If you are just layering your shingles as a temporary fix because you have a full roof replacement budgeted in within the next several years, then you can probably layer the shingles while avoiding the aforementioned issues. However, if you don't plan on a new roof in the near future, then it is likely in your best interest to invest in an energy-efficient and high-quality roof now. Your best bet is to speak to a qualified and professional roofer, who can help guide you in the right direction. 


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