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  • Writer's pictureMeredith Ott

Can Coating My Roof Stop Leaks? Probably Not

Updated: Apr 21, 2023

Polyurethane or silicone coatings are a popular option for roof repairs, but it's important to understand that it may not always be effective in stopping leaks. In my previous blog about trying to stop leaks with tar, https://www.heartroofingflorida.com/post/can-i-fix-my-roof-leak-with-tar-not-very-well, roof coatings are the same. Here are some reasons why:

  1. Polyurethane or a silicone coating is not a standalone solution: While polyurethane or silicone coatings can help seal small cracks and leaks, it's not a standalone solution for repairing roofs. In fact, using it as the sole repair method can lead to more extensive damage over time. It's essential to identify the underlying cause of the leak and address it before applying any coating.

  2. The surface must be properly prepared: Polyurethane or a silicone coating requires a clean, dry surface to adhere properly. If the surface is not properly prepared, the coating may not bond correctly, leading to the formation of air pockets and bubbles that can eventually lead to leaks. Even a small amount of moisture or debris can prevent the coating from adhering correctly.

  3. Temperature and humidity can affect performance: Polyurethane or silicone coatings are sensitive to temperature and humidity. They require a specific range of conditions for optimal performance, and if applied outside of this range, the coating may not cure correctly. For example, if the coating is applied on a day with high humidity, it may not cure fully, leading to leaks.

  4. Coating thickness matters: The thickness of the coating is essential for proper protection against leaks. If the coating is too thin, it may not provide adequate protection against water infiltration. On the other hand, if the coating is too thick, it may not cure correctly and could crack, leading to leaks.

  5. Polyurethane or a silicone coating is not a long-term solution: While polyurethane coating can help address leaks temporarily, it's not a long-term solution. Over time, the coating will wear down, crack, and peel, leaving your roof vulnerable to leaks once again. It's essential to address the underlying cause of the leak and consider a more permanent solution.

Popular roof coating named Gaco. www.gaco.com


In conclusion, while polyurethane or silicone coatings can be a helpful tool in repairing leaks, it's not always the best solution. Addressing the underlying cause of the leak and ensuring proper surface preparation and application are essential for its success. Additionally, it's important to consider a more permanent solution for long-term protection against leaks. If you would like to find out if our roof is a candidate for the rejuvenating benefits of a roof coating please call us today for a free estimate. 321-499-3012


For more pictures visit:

This image shows a flat roof covered in roofing sealant, with a smooth, black surface that has been coated with a reflective finish to help improve energy efficiency. Flat roofs are commonly found on commercial buildings and are known for their simplicity in design and ease of maintenance. The roofing sealant applied to the surface of this roof serves as a protective layer against the elements and helps prevent leaks and other forms of damage. The reflective finish on the sealant helps to reduce cooling costs by reflecting sunlight and reducing the amount of heat absorbed by the roof. This not only improves the building's energy efficiency but can also extend the lifespan of the roof itself. By investing in high-quality roofing sealant and regularly maintaining their flat roofs, building owners can help ensure the long-term protection and performance of their property.
Beachside flat roof with Gaco roof coating

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