The Disadvantages of Installing New Shingles Over Old Shingles

The Disadvantages of Installing New Shingles Over Old Shingles

The Disadvantages of Installing New Shingles Over Old Shingles

Choosing to over-shingle your roof or replace old shingles with new ones often entails a big investment of time, money, and effort. But as homeowners know well, this is a necessary expense if you want your roof to last as long as possible. One issue homeowners should be aware of is the difference in costs and time between replacing old shingles and Installing New Shingles.

Over-shingling an Old Roof

The process of over-shingling involves constructing a new roof on top of an existing one. There are two primary reasons why homeowners choose to over-shingle: one is to protect the roof better, and the other is to increase its curb appeal. What the process entails is installing a new shingle roof on top of your old shingles.

Over-shingle installations come in two types: complete and partial. In a complete over-shingle, all of the old shingles are removed and the new one installed on top. To do this, you will install the shingles at the same starting point as your old ones. You will not be able to remove all of your old shingles, as they are still attached to your roof.

In a partial over-shingle, only some of the old shingles are removed and replaced with new ones. This is recommended if you want to keep most of your old shingles. The process of over-shingling is a major one and requires a great deal of time and effort. If you are not sure whether you are capable of doing it, hiring professionals is highly recommended. This process also requires additional roofing supplies such as nails, shingle adhesive, and tar paper. In addition, it requires the services of roofing contractors for installation.

You May Lose The Manufacturer’s Warranty

If you decide to over-shingle your roof, then you must do so with the help of a professional roofing contractor. You may have to hire them right away as part of the process, and they will also guarantee that your shingles are installed properly before they leave. This is because installing new shingles over old ones voids the manufacturer’s warranty and specifications that were not previously there.

The Durability of The Shingles Will Be Less

New shingles have a shorter lifespan than old ones. This is because they are thinner and more fragile. This means that they will not last as long as your original shingles. The wear and tear of the material also contribute to this reduced lifespan. As a result, over-shingle installations tend to be less durable than those with old shingles installed on new siding because you are essentially building a new roof over an old one that did not need to be replaced. 

The Cost of Over-Shingle Is High

The cost of an over-shingle installation is usually higher than a new one. This is because you will be removing all of your old shingles to install new ones. In addition, you will lose the added curb appeal of old shingles and gain only a minimal amount in insulation when compared to the cost of entirely new shingles. Since over-shingling involves additional costs, homeowners should be prepared for those before they start the process.

Your Home Has The Potential of Being Covered By Insulation

The old shingles that you remove will become insulation. Although it is not expected, this can add an extra layer of insulation to the roof if you are insulating your home with blown-in insulation. This means that your home’s temperature could go up if the heat from your system goes up because less material is adding heat to the roof. This will increase the expense of a new shingle roof and additional labor needed for the removal and reinstallation of an over-shingle.


The best option is to decide the architectural appearance that a new or partially new roof will have before beginning any sort of shingle roofing repair process. In addition, homeowners should ask their contractor about the cost of over-shingling a roof before starting such a project. The cost of an over-shingle may be more than you think, and the added time and labor will distract you from your other projects at home, both interior, and exterior. If you are interested in scheduling a free inspection contact us today!

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