House Washing in Katy, TX

House washing in Katy, TX is maintenance, not luxury. Houston's consistently high humidity — averaging 75%+ year-round — creates ideal conditions for algae, mold, and mildew growth on every exterior surface. Most Katy homeowners notice the green-black streaking on their siding and think it is just dirt. It is almost always biological: living algae and mold colonies feeding on moisture and organic material on your home's exterior, and they spread if not treated.

What grows on Katy homes — and why

The most common growth on Katy home exteriors is Gloeocapsa magma — a cyanobacteria that appears as dark streaking or black staining, most visible on lighter siding colors. This organism is not just a stain; it is a living colony that eats into paint and eventually degrades the underlying substrate. On vinyl siding, biological growth accelerates UV degradation. On wood siding, it retains moisture that feeds rot. On stucco — common in Katy communities like Cinco Ranch — it penetrates micro-cracks and slowly erodes the surface.

Katy's flood-prone areas experienced additional contamination from Hurricane Harvey's floodwaters. Homes that flooded in 2017 were exposed to bacteria-laden water and mud that deposited on exteriors and, in many cases, was not fully treated after the flood. We regularly find residual biological contamination on home exteriors in affected Katy neighborhoods even now — it becomes visible during wet seasons when the organisms activate.

Our soft wash approach for Katy homes

We do not pressure wash siding. High-pressure washing drives water behind siding panels, can strip paint, and can damage window seals. Our house washing process uses soft wash technology: a biodegradable cleaning solution applied at low pressure that kills biological organisms at the root and rinses clean without surface damage. This approach is safe for vinyl, fiber cement (Hardie board), wood, brick, and stucco. The cleaning solution remains active after application, eliminating organisms down to the root and providing residual protection that slows regrowth.

Katy's specific house washing challenges

Several Katy neighborhoods present specific washing challenges we are experienced with. Homes in heavily treed areas of Kelliwood and Nottingham Country accumulate organic debris and growth faster than homes in open areas because shade prevents drying. We adjust our solution concentration and application method for these situations. Older brick homes in established Katy neighborhoods often have efflorescence — white salt deposits that leach through the mortar. Efflorescence requires a different treatment protocol from biological growth, and incorrect treatment can drive salts deeper into the brick face. We identify the type of staining before applying any chemical treatment.