Pros and Cons of Roofing Over Existing Shingles


Roofing is an essential aspect of any building, providing protection from the elements and ensuring structural integrity. When it comes to re-roofing, homeowners are often faced with the decision of whether to remove the existing shingles or to simply roof over them. While roofing over existing shingles can save time and money, there are both pros and cons to consider before making this decision.

One of the main advantages of roofing over existing shingles is the cost savings. Removing the old shingles can be a labor-intensive and costly process, as well as generating more waste material. By roofing over the existing shingles, homeowners can save on labor costs and disposal fees. Additionally, it can also save time as the process of removing shingles can be time-consuming.

Another benefit of roofing over existing shingles is the added layer of protection. The additional layer can provide an extra barrier against the elements, potentially extending the lifespan of the roof. It can also help to prevent leaks and water damage, as well as providing added insulation to the home.

However, roofing over existing shingles also comes with its own set of drawbacks. One of the main concerns is the added weight to the roof. While most building codes allow for a second layer of shingles, adding a third layer can exceed the weight limit for the roof structure, leading to potential structural issues.

Another downside is the potential for trapped moisture. Moisture trapped between the layers of shingles can lead to mold and mildew growth, as well as causing the shingles to deteriorate faster. It can also make it more challenging to detect roof leaks and damage, leading to more costly repairs in the long run.

In conclusion, roofing over existing shingles can be a viable option for homeowners looking to save time and money. However, it is important to weigh the pros and cons carefully before making a decision. Consulting with a roofing professional can help determine if roofing over existing shingles is the best choice for your home.