Short answer: Algae shows up as flat black or dark green streaks that spread with wind and rain, while moss grows as raised, fuzzy green patches that tend to hold moisture against the roof. Both call for the same safe method to remove, a soft wash rather than a pressure washer, though moss usually needs more work to lift off first.
How to tell them apart
Algae, specifically a type called Gloeocapsa magma, spreads as flat black streaks that run with the slope of the roof and wind direction, feeding on the limestone filler in shingles. Moss grows upward in raised, fuzzy green clumps rather than flat streaks, and it tends to show up in shaded, damp spots like under overhanging branches or on a north-facing slope.
Moss holds onto moisture the way a sponge does, which is part of why it is treated more carefully than algae. Algae, by contrast, spreads mainly by wind carrying spores from an already-affected roof nearby.
Why high pressure is the wrong tool for either one
A pressure washer aimed at shingles strips the protective granules off, which is permanent damage that shortens the roof's life regardless of whether you are removing algae or moss. That risk is the same for both, which is why neither one should be tackled with a rented pressure washer and a ladder.
The right method: soft washing
A soft wash applies a cleaning solution at low pressure to kill the algae or moss at the root, then rinses it off gently rather than blasting it loose. Moss often needs a gentler physical step worked in alongside the solution, since its raised growth holds on more stubbornly than a flat algae streak.
Why this is not a ladder or DIY job
Any roof work means real fall risk, and wet shingles or tile get slick fast once a cleaning solution and rinse water are involved. That risk exists regardless of which growth you are dealing with, which is a big part of why this is a job for a professional with the right equipment rather than a homeowner with a garden sprayer and a ladder.
Where things stand with Puma right now
Puma's roof cleaning service is coming soon and is not available to book yet, so no price is listed for it at this time. In the meantime, keeping gutters clear and trimming back branches that shade the roof can slow how fast either algae or moss builds up.
In Volusia County
Volusia County property records show shingle roofs make up 77% of homes in the county, the material most affected by the algae that feeds on its limestone filler, with tile at 2%, metal at 7%, flat roofs at 3% and other materials at 10%.
Questions people ask
Does moss mean my roof has a bigger problem than algae?
Moss holding moisture against the roof over a long time is worth keeping an eye on, but by itself it is a cleaning issue, the same as algae, not automatically a sign of structural damage.
Can I use a store-bought roof cleaner from the ground?
Reaching a full roof evenly from the ground is difficult, and getting consistent coverage without a ladder is hard to manage safely.
Will algae or moss come back after cleaning?
Both can return, especially in shade or under overhanging branches, since the spores and moisture that caused it the first time are usually still around.
When will Puma offer roof cleaning?
Roof cleaning is coming soon. There is no booking or price available for it yet.
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