Why You Should Never High-Pressure Wash Your Spokane Roof

When homeowners in Spokane Valley, Liberty Lake, and the surrounding areas look up and see black streaks, dark patches, or thick green moss taking over their roof shingles, the knee-jerk reaction is often to grab a pressure washer or hire a cheap handyman to blast it clean.

Stop right there. High-pressure washing your roof is one of the fastest ways to destroy it.

The Damage High Pressure Causes

Asphalt shingles are covered in tiny, abrasive ceramic granules. These granules are your roof’s armor—they reflect UV rays, protect the asphalt from baking in the sun, and give the shingle its strength.

When you point a high-pressure nozzle at a shingle, you blast those granules right off. You might get rid of the moss for the moment, but you’re essentially stripping the life out of your roof, leaving the raw asphalt exposed to sun damage, cracking, and premature leaks.

Why Moss and Algae Love Our Area

Our wet Pacific Northwest springs, heavy winter snows, and shady neighborhood trees create a moisture trap on roofs—especially on the sides that don't get much direct sunlight. Moss loves that damp, organic environment. As it grows, its roots lift up the edges of the shingles, letting wind-driven rain slip right underneath into your attic.

The Safe Solution: Roof Soft-Washing

Professional roof cleaning doesn’t use brute force; it uses chemistry and low pressure.

A specialized soft-wash solution is safely applied to the roof to kill the moss, algae, and mold down to the root. Once the organic growth dies, it naturally decomposes and washes away harmlessly with the rain over the next few weeks—all without a single drop of high pressure touching your shingles. It protects your roof warranty and doubles the lifespan of your investment.

Leave the Roof Work to the Pros

Climbing up on a steep, wet, moss-covered roof is dangerous. Don't risk a fall or thousands of dollars in shingle damage.

Call or text Blast Bros at (509) 362-3034 today for a safe, professional roof soft-washing quote in the Spokane area!