Properly Cleaning Silicone Roof Coating with Soft Wash Technique

Protecting Pacific Palisades: Soft Washing Silicone Coatings for Long-Term Performance

The silicone-coated roof at this Pacific Palisades home on Oahu had become infested with organic growth, including algae, mildew, and lichen. Rubberized roof coatings, such as GACO, HydroStop, and Henry, are designed to provide a durable, waterproof barrier that protects underlying roofing materials from moisture intrusion, UV damage, and temperature extremes. These coatings are highly reflective and flexible, allowing them to expand and contract while maintaining a seamless protective layer. However, when organic growth accumulates on the surface, it can trap moisture, reduce reflectivity, and create darkened areas that absorb heat. In Pacific Palisades, the combination of high elevation, consistent trade winds, frequent rain, and shaded valleys creates a microclimate that accelerates the growth of these organisms, making regular cleaning essential for maintaining the roof’s functionality and energy efficiency.

Leaving organic growth untreated can lead to costly long-term consequences. The trapped moisture can degrade the silicone coating over time, leading to reduced waterproofing, accelerated wear, and the potential for leaks or damage to the underlying roof deck. Algae, moss, and lichen can also create persistent staining that is difficult to remove and may reduce the coating’s reflective properties, increasing interior heat load and energy costs. Soft washing is the recommended cleaning method for silicone roofs because it uses low-pressure application and specialized cleaning solutions to safely remove growth without damaging the coating. By removing organic buildup gently and thoroughly, soft washing restores the roof’s performance, preserves its lifespan, and protects the homeowner from costly repairs and premature replacement.

Total areas cleaned: Entire roof of home.

Geographical considerations: Higher elevation, consistent wind, frequent rain, & shaded valleys.

Finshed Work: See below.

Completed Work on Palisades Soft Wash Job: