Urethane Silicone Basics
Urethane silicone blends polyurethane resilience with silicone water resistance. It bonds well to concrete, metal, tile, and brick. Surface preparation, cleaning and drying, is essential for adhesion.
It provides a flexible, weather resistant seal. It stays elastic after curing, helping prevent water entry. Choose the right formulation and proper curing for durability.
Transparent versions exist for cosmetic joints, with colored options. Avoid overpainting silicone, which can harm elasticity. Choose exterior UV resistant products and low VOC formulas.
Rooftop and Exterior
Rooftops, balconies, and exterior walls face thermal cycling and sun. Urethane silicone seals provide adhesion and movement tolerance. Start with thorough cleaning and remove old coatings.
Choose exterior-grade formulations with UV stability and weatherproofing. Apply with a cartridge gun, then smooth with a wet finger. Let cure fully according to the manufacturer.
For exterior walls, use backer rods to control bead depth. Use a compatible primer on porous substrates to improve adhesion. After curing, test with water spray to verify performance.
Bathroom and Wet Areas
Bathrooms demand reliable seals where water exposure is constant. Urethane silicone provides elastic sealing around showers and tiles. Ensure surfaces are dry and free of residue before application.
Choose formulations compatible with humid interiors. Avoid silicone on certain alkali substrates without primers. Test a small joint first to verify cure time.
Clear silicone can blend with grout lines for a seamless look. Install a moisture barrier behind tile to reduce mold. Regular inspection and timely resealing extend waterproofing life.