Silicone roof coating is designed to provide a flexible, waterproof barrier that protects your roof from water damage and UV rays. However, blistering can occur when air or moisture gets trapped beneath the coating during application or if the roof surface isn’t properly prepared. This trapped moisture expands under heat, causing bubbles or blisters to form. Improper curing or applying the coating over a damp surface are common reasons, as silicone needs a dry, clean base to adhere well. Simple checks you can do yourself include looking for soft or spongy spots on the roof, or visual signs of bubbles and peeling. Gently pressing on suspected blisters can help identify if there’s trapped air or moisture beneath. Avoid puncturing any blisters since this can sometimes worsen the problem or compromise the coating’s waterproofing.
If you spot persistent or widespread blistering, or if the coating seems to be breaking down early, it’s best to call a professional roofer to avoid further damage. A roofer will check for underlying moisture issues and inspect the roof’s condition thoroughly. When speaking with a contractor, ask if they perform moisture tests before applying silicone coatings and how they ensure the surface is properly prepared and dry. It’s also good to verify what warranty they offer on both materials and installation, and what steps they recommend for ongoing maintenance to prevent future blistering. Being proactive and careful with these checks helps maintain your roof’s integrity and extend the life of your silicone coating.