1. Assess the roof
We check the pitch, the shingle condition and where the growth is heaviest before quoting.
Services
Roof soft wash
The black streaks on your roof are a living organism, and it can be removed without walking granules off your shingles.
Those dark runs down a roof are gloeocapsa magma, a hardy algae that feeds on the limestone filler in asphalt shingles. It spreads downhill with the rain, which is why the streaking always runs vertically.
It cannot be pressure-washed off safely. The granule layer is what protects the asphalt from UV, and high pressure strips it, taking years off the roof to fix a cosmetic problem. Soft washing kills the organism in place and lets the weather rinse the residue away over the following weeks.
What the service includes
- Full roof plane treatment, including north-facing slopes where growth is worst
- Moss and lichen treated at the root rather than scraped
- Gutters and downspouts flushed of loosened debris
- Surrounding siding and landscaping rinsed
- Photographs before and after, taken from the ladder
How the job runs
2. Treat from the ladder
Application is done from the edge wherever possible. Less foot traffic on a roof is always better for it.
3. Rinse the surrounds
Everything below the roofline gets rinsed so nothing is left to stain siding or planting.
Common questions
Will this void my shingle warranty?
Low-pressure cleaning is the method shingle manufacturers generally point to for algae removal, precisely because pressure washing is what damages the granule layer. Check your own warranty terms.
Why does the roof still look patchy after?
Some staining lifts over the following few weeks as rain rinses the dead growth away. That is normal and expected on heavy lichen.
Can you do this in any weather?
We avoid heavy rain and high wind. Overcast and still is close to ideal.
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