Rooftop Urethane Coatings
Urethane coatings provide a flexible, crack-bridging layer that resists UV and weathering on flat and slightly pitched rooftops. Before applying, clean the surface, repair cracks, and ensure the substrate is dry and sound to maximize adhesion. For large roofs, a distribution manifold can help channel material evenly to multiple spray heads, improving coverage and reducing lap lines.
Choose between moisture-curing one-component systems and two-component polyurethane kits based on site conditions and VOC regulations. Primers improve adhesion on concrete, asphalt, or metal substrates, and the topcoat protects against UV and ponding water. During application, control temperature and humidity to avoid skinning or improper cure, and monitor wind across the roof.
Basement Waterproofing
Basements face moisture and hydrostatic pressure, so a urethane coating can function as a continuous barrier on concrete walls. Prepare by cleaning, repairing cracks, and ensuring the wall is dry and sound; address any rising damp with a moisture barrier. Choose a coating that tolerates intermittent dampness, with good adhesion to cementitious substrates and adequate elongation to handle movement.
Apply primer if needed and ensure proper cure conditions. Regularly monitor humidity and avoid rapid temperature changes that can lead to blistering. Plan for occasional re-coats as walls settle and moisture exposure evolves.
Application Techniques
Use spray equipment with a distribution manifold to ensure even material flow across large areas. Maintain proper nozzle size, spray distance, and overlap to minimize pinholes and brush marks. Consider substrate temperature and ambient humidity to achieve optimal cure and adhesion.
For complex geometries, combine spray with roller or squeegee to fill corners and joints. Inspect during application for surface imperfections and rework immediately to avoid curing defects. Always follow safety guidelines for polyurethane coatings, including ventilation and PPE.
Materials and Maintenance
Material selection should balance cure speed, VOC limits, adhesion to substrate, and flexibility to accommodate movement. One-component moisture-curing systems offer simplicity and rapid cures, while two-component formulations provide higher chemical resistance and longer pot life. Primer compatibility and suitable topcoats extend service life and preserve performance under UV and weather.
Maintenance involves regular visual inspections and cleaning with non-abrasive products that do not degrade the film. Schedule re-coats based on traffic exposure, substrate movement, and product recommendations, typically every 5–10 years. Document substrate conditions and environmental factors to plan future repairs and ensure consistent protection.