Detailing valleys on a silicone roof coating requires careful attention because this area is prone to water pooling and increased wear. Valleys can be woven, closed-cut, or open metal, each with unique characteristics. A woven valley has shingles interlaced for a seamless look, while a closed-cut involves cutting one row of shingles neatly over the other, creating a clean line. Open metal valleys are lined with metal for extra durability and water shedding. Silicone roof coatings are great for waterproofing but need proper prep in these critical sections. The surface must be clean and dry, free of debris or rust on metal valleys. Before applying silicone, any seams, fasteners, or gaps should be sealed with compatible, flexible sealants to prevent leaks. Silicone elastomeric coatings can bridge small cracks but won't fix major gaps or damaged flashing. Doing simple DIY checks like inspecting the valley for cracks, loose shingles, or rust on metal can help you catch problems early. Make sure water flows freely without holding in low spots or under shingles, and verify that your existing roofing materials are compatible with silicone coatings to avoid adhesion issues.
If you decide to call a roofer, it’s important to ask clear questions that relate to both the roofing system and the silicone application. For example, you could ask: “How will you prepare the valley for silicone coating to ensure long-lasting adhesion and watertightness?” and “What products and techniques do you recommend for sealing seams and edges before applying the silicone?” A good contractor will explain how they clean and prime the surfaces, address any flashing repairs, and apply the coating smoothly across all valley types. They should also be aware of warranty implications, as improper valley preparation or incompatible materials might void a roofing or coating warranty. Since valleys are a common leak source, professionals often suggest reinforcing these areas as part of the upgrade. Working with an experienced roofer familiar with silicone coatings and valley details increases your chance of a durable, watertight finish that protects your home for years.