Can You Shingle Over Shingles to Cut the Renovation Budget?

It is not a new thing for homeowners to wonder whether you can shingle over shingles. It is common since replacing the roof can be quite costly for most people. Therefore, the only viable choice is to add a new roof layer instead of replacing the old one. Nevertheless, before doing it for your dwelling, there are things to understand concerning this matter.

Can You Shingle Over Shingles?

The straightforward answer is yes, you can install new shingles over the old ones, making this method a viable roofing solution. However, this might not always be the best choice for every homeowner. It’s essential that the existing shingles are in good condition and that the roof structure can support additional weight.

Furthermore, adherence to local building codes is crucial, as most limit the number of permissible roof layers, typically to a double-layered roof.

can you shingle over shingles

Moreover, specific conditions of the original roof must be met to add asphalt shingle layers successfully. It’s a good idea to consult with a roofing contractor or home inspector to assess the feasibility and potential risks of adding shingles on top of the existing layer.

Problems with Two Layers of Shingles

While adding a second layer is possible, it’s important to recognize potential drawbacks. The lifespan of the new shingles may decrease by up to 40%, so thorough consideration is essential before proceeding.

Another potential issue with the second roof shingles layer is the deck condition

The roof deck is the foundation for the entire roofing system itself. By adding a new layer of a roof over the existing one, it is impossible to observe the condition of the deck. Thus, any issue on the deck will remain there without any chance to repair appropriately until a complete replacement of the roof itself.

There is also the weight issue to consider in this matter

The second layer of shingles undoubtedly adds weight to the roof. It eventually affects the overall structure of the roof and the building itself. Therefore, it is not the best option for homeowners with older houses. In addition, the heavier weight of the roof may lead to potential risks of a disaster waiting to happen in the future.

The next thing to consider as one of the potential problems with re-roofing is trickier maintenance

It is best not to focus only on whether you can shingle over shingles. It is also best to think about the tricky maintenance of the roof itself. With two roof layers, it will be difficult to track the origin of any issue regarding the roof.

Furthermore, the roof’s overall appearance may not be as good as a complete replacement procedure. Therefore, the current layer must be perfect for the second layer to look nice. Otherwise, the roof will not have a smooth and even surface. All in all, several things must be considered before deciding on this particular matter.

The Verdict

While it is technically feasible to add multiple layers of roof shingles—up to 100 square feet or more—it may not always be the best option. Deciding whether to add a new layer should involve careful consideration of the condition of the existing shingles and consultation with a professional.

Ultimately, ensuring that your roofing project respects local building codes and is suited to the specific conditions of your roof is paramount.

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RoofLast is an experienced author and roofing expert. With years of practical experience in the field authored several informative articles on various aspects of roofing, including installation, maintenance, and repair