We all want a clean looking roof, especially when we see dirt, black streaks, moss, or algae. But when it comes to cleaning your roof, more isn’t always better, and this is especially true when it comes to power washing. High-pressure washing tools can actually shorten your roof’s lifespan and lead to expensive repairs.
Here’s why pressure washing your roof is usually a bad idea:
1. Power Washing Can Strip Away Protective Layers
Asphalt shingles are made with a protective granule coating. This shields the roof from the sun’s UV rays and harsh weather. High-powered jets of water can blast these granules off, weakening your shingles and leaving your roof vulnerable.
2. It Doesn’t Address the Root Problem
Dark streaks on your roof can be caused by algae or moss. These thrive in damp, shaded areas. Blasting them off won’t prevent them from coming back, and it will give them extra moisture. A better approach is treating the roof with a gentle, roof-safe cleaner and ensuring proper ventilation and sunlight exposure.
3. It Could Lead to Leaks
If high-pressure water gets under the shingles, it can penetrate the underlayment. This can lead to leaks, especially when it comes to older roofs.
The Safer Solution
Instead of pressure washing, there are many, safer alternatives. In some instances, soft-washing can be used. This involves low-pressure water and often uses biodegradable cleaning agents. We recommend always hiring a roofing professional who knows how to clean your roof without damaging it for the best outcome.
