Manoa Roof Makeover via Soft Wash Service

Keeping Manoa Roofs Clean: Why Soft Washing Beats Pressure Washing

The aluminum lock shingle and GACO silicone roofs at this Manoa home on Oahu had become heavily infested with organic growth, including algae, mildew, and lichen. Manoa’s cool, shaded valleys, high humidity, and frequent rainfall create a unique microclimate that encourages rapid growth of these organisms. On aluminum lock shingles, organic buildup can trap moisture in seams and under panels, accelerating corrosion, staining, and premature wear. Silicone roof coatings, while highly durable and waterproof, are prone to surface staining and reduced reflectivity when algae or mildew accumulate. In both cases, unchecked growth not only diminishes the roofs’ aesthetic appeal but can also reduce energy efficiency by causing darkened surfaces that absorb more heat from the sun.

Pressure washing these roof types can be extremely damaging—high-pressure water can bend, lift, or puncture aluminum shingles and may cause micro-tears or delamination on silicone coatings. Soft washing is the recommended cleaning method because it uses low-pressure application and specialized cleaning solutions to safely remove organic growth at the root without compromising the integrity of the roofing materials. By gently cleaning the surfaces, soft washing protects the systems from accelerated wear, restores curb appeal, and helps prevent rapid regrowth of organic material.

Total areas cleaned: Aluminum lock shingles on roof of Manoa home.

Geographical considerations: This area of the island has high humidity and rainfall, promoting organic growth.

Finshed Work: See below.

Completed Work on Manoa Makeover Job: