Common Roofing Issues: Wrong Coating For Roof Type Problems
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Choosing the right roof coating system is the first decision, and it's possibly the most important choice you'll make. Using the wrong roof coating for your specific roof surface can lead to premature failure, costly damage and a compromised building envelope.
Roof coatings are specially formulated to work with particular roofing materials and in certain environmental conditions. There are a lot of different types of roof coatings with some of the most common types being:
- Silicone roof coatings
- Polyurethane coatings
- Acrylic coating system
The professional roofing contractor you consult with can help you select a coating that's compatible with your roof material and local weather. But if they don't follow manufacturer recommendations or don't fully understand roof coatings it can cause coating failure issues that go down to the roof deck.
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Common Problems Using the Wrong Roof Coating
Maybe a silicone coating was used on EPDM without using a primer. Or maybe you used an acrylic coating system on a flat roof. Whatever the scenario is, if material compatibility is lacking so will your roof coating.
Poor Adhesion and Peeling
Coatings designed for one substrate may not bond correctly with another. For example, silicone applied over an acrylic-coated or metal roof can peel and blister, leaving the roof exposed.
Cracking and Shrinking
Some coatings shrink excessively on certain roof types. Acrylic coatings on metal roofs tend to crack and pull away due to metal’s temperature-induced expansion and contraction.
Water Intrusion and Rust
Incorrect coatings can trap moisture or allow water infiltration. On metal roofs, this can accelerate rusting beneath the coating, leading to structural damage.
Reduced UV Protection
A coating not rated for your climate or the roof's UV exposure won’t provide adequate protection from sun damage, fading and brittleness. The home's energy efficiency will be reduced while your cooling costs increase since there's a higher level of heat absorption.
Poor Weather Resistance
Not every roof coating was made to handle temperature fluctuations, high humidity and extreme heat. This too can have a negative impact on how the coating works and your energy bills.
Wasted Money Instead of Cost Savings
The wrong coating will degrade fast, requiring costly repairs or full replacement sooner than a properly selected system would. It's not a good investment of your time or money.

Correcting Issues When the Wrong Type of Roof Coating Was Used
When the wrong roof coating is applied to a roof system, repairs involve careful removal of the unsuitable coating, proper surface preparation and applying the correct coating system to restore durability and protection. Below is a detailed overview of the process building owners need to take to correct a mismatched coating problem.
Assess the Roofing System and Plan Ahead
Proper diagnosis and application are key to getting the protection and longevity you expect from roof coating repairs. Inspect the roofing system carefully to identify the subsequent problems and where they exist on the roof.
You'll also need to confirm the correct coating type that's required for the roof material and local conditions to select an appropriate repair approach.
Remove the Incorrect Coating
Remove failed or incompatible coating sections by scraping, power washing or sanding the surface to expose a clean substrate. In some cases, complete removal of the wrong coating is necessary to prevent adhesion issues with the new system.
Proper Surface Preparation
Clean the roof thoroughly to remove everything — dust, debris, oils and residues. Skipping this step could impede the bonding process.
Next, any roof damage such as cracks or blisters needs to be repaired. Ensure the surface is completely dry before moving on.
Apply Primer and the Correct Coating
It's critical that you follow the coating manufacturer recommendations, which could suggest using a primer to promote chemical bonding between the substrate and new coating. When you move on to the next step of coating the roof with the proper roof coating material, follow the manufacturer thickness and application guidelines exactly.
Proper Maintenance and Inspections Moving Forward
To maximize the performance of the corrected coating system you'll want to conduct regular roof inspections and maintain it as needed. The secret to improving a roof's life span is fixing problems early before they keep getting worse with regular maintenance.
The trained professionals at LOA know how to properly pair the right roof coating with the existing roofing material so that you get better performance not more repairs. Austin area property owners that are dealing with a mismatched roof coating can call us at 512-375-3654 or schedule a free roof inspection online.