Roof Cleaning Houston TX

Why Houston Roofs Turn Black

If you have driven through almost any Houston neighborhood, you have probably seen it: dark black or dark green streaks running down rooftops. Those streaks are not just dirt or age. They are caused by a type of algae called Gloeocapsa magma that thrives in Houston's warm, humid environment. This algae feeds on the limestone filler found in asphalt shingles, and once it takes hold, it spreads across your roof quickly.

Houston's climate is almost perfectly designed to grow roof algae. The city gets over 50 inches of rain annually, summer temperatures sit in the mid-90s, and humidity rarely drops below 60%. Add in the occasional tropical storm or hurricane that brings days of heavy rain, and your roof is under constant biological attack from spring through fall.

The Problem with Dirty Roofs

Algae-covered roofs are more than an eyesore. The dark growth absorbs heat instead of reflecting it, which can raise your attic temperature and increase your cooling costs during Houston's long, hot summers. Over time, algae also breaks down the granules on asphalt shingles, shortening the life of your roof. If you have a flat or low-slope roof, which is common on many Houston homes built in the 1960s through 1980s, moisture retention becomes an even bigger concern because water pools rather than draining away.

Houston also has a mix of roofing styles that each present their own challenges. Older homes in Montrose and The Heights often have composition shingles under heavy tree canopy. River Oaks mansions may have clay tile or slate. Newer homes in Katy and Sugar Land typically have architectural shingles. Each roof type requires a different approach to cleaning.

Our Soft Wash Roof Cleaning Process

We never use high-pressure water on roofs. Instead, we use a soft wash system that applies a specialized, biodegradable cleaning solution at very low pressure. Here is how the process works:

• Ground-level inspection of the entire roof to identify algae, moss, and lichen growth
• Pre-treat gutters and downspouts to prevent clogging from loosened debris
• Apply our eco-friendly cleaning solution across the entire roof surface
• Allow the solution to dwell and kill algae and moss at the root level
• Light rinse with low-pressure water to remove dead organic material
• Check and clean gutters after the treatment

The results are visible almost immediately. Black streaks disappear, and your roof's original color comes back. The treatment also provides residual protection that slows regrowth for months after the initial cleaning.

Flat Roofs and Commercial Roof Cleaning

Houston has more flat commercial roofs than almost any other Texas city, thanks to its dense commercial districts in the Galleria area, downtown, the Medical Center, and the Energy Corridor. Flat roofs collect standing water and organic debris, making them especially prone to algae and mold growth. We clean flat roofs of all sizes, from small retail storefronts to large warehouse and office buildings.

Frequently Asked Questions