Silicone roof coatings are popular for their flexibility, waterproofing, and UV resistance. However, thermal movement—the natural expansion and contraction of roofing materials due to temperature changes—can sometimes cause issues with these coatings. As the roof heats up during the day, materials expand, and they shrink again when cooler at night. Silicone coatings are designed to accommodate this movement to a degree, but excessive or repeated thermal cycling might lead to cracks, blisters, or peeling over time if the coating isn’t applied properly or the substrate beneath moves too much. Simple DIY checks include inspecting the roof surface for any visible splits, wrinkles, or areas where the coating feels less adhered. Touch the surface for softness or tackiness, which can indicate breakdown. Also, look closely at seams, corners, and edges where movement is more pronounced. If you notice early signs like small cracks or bubbles, take photos and monitor them over a few weeks to see if they grow or spread.
If you find signs of aging or damage, it’s wise to call a professional roofer familiar with silicone coatings. Ask your contractor how they handle thermal movement in their application process and what their experience is with coatings on roofs that undergo significant temperature fluctuations. A good question could be, “What kind of surface preparation and primer do you recommend to ensure silicone coating flexibility and adhesion over time?” Also ask, “How do you assess if my roof substrate has movement that might affect coating performance?” While silicone coatings are generally flexible and durable, improper installation or unsuitable roof conditions can void manufacturer warranties, so it’s crucial the roofer follows guidelines closely. A trained pro can also advise whether re-coating is viable or if repairs or reinforcements are needed before applying silicone again.