Why Richmond Commercial Roofs Need Soft Washing

Kentucky’s humidity and summer heat create near-perfect conditions for algae, mold, and biofilm growth on commercial roofs. Central Kentucky’s climate — warm springs, humid summers, and mild wet winters — means Richmond businesses face this problem year-round. The greenish-black streaks you see on flat commercial roofs are actually gloeocapsa magma, a cyanobacteria that feeds on limestone-based filler in roofing membranes. Once established, it spreads rapidly and retains moisture against the membrane surface.

For white TPO and PVC membranes, which are chosen specifically for their heat-reflective properties, algae and biofilm create a dark layer that absorbs heat instead of reflecting it. Studies show this can reduce reflectivity by 25–30%, meaning your HVAC system works significantly harder every summer month. For a 10,000 square foot commercial building, this translates directly to higher energy bills — money that could be avoided with a scheduled cleaning program.

Many property managers make the mistake of calling a pressure washing company. High-pressure washing destroys TPO and EPDM membrane seams, voids manufacturer warranties, and forces water into the roof system rather than cleaning the surface. Soft washing uses low-pressure application of biodegradable cleaning solutions that kill biological growth at the source, then rinse clean without damaging membrane seams or flashings.

Most major membrane manufacturers — Firestone, Carlisle, Johns Manville — recommend soft washing as the only approved cleaning method. Some NDL (No Dollar Limit) warranty programs require documented cleaning to maintain coverage. White Services Group uses only manufacturer-approved cleaning agents safe for all common commercial membrane types. We serve Richmond and all of Madison County, including commercial properties in Berea, Irvine, and Mount Vernon.