The problem for composition scraping embedded moss can de-laminate the composition from the fiberglass backing and cause roof damage and failure.
Composition has definition (cracks and crevices) that can be missed by a brush. Moss spores reproduce in the billions. That’s why your roof can be cleaned this way and moss returns almost by the next season. Bacteria and fungus spores re-grow under your shingles…where brushes cant reach. The only way this method works is removing loose moss and debris laying on the roof then applying an active treatment to do the rest to actually eliminate the roots and live, embedded portions that would be damaging to remove by agitation. Reject passive treatments!
The problem for shake (wood) is the wood itself is organic and like a sponge it has pores that hold in spores. Cleaning without an effective treatment is only temporary.
The problem with concrete tile is the size of the areas moss and its roots can hide in. The process is very effective to remove moss from the visible areas but like most other methods, the type of treatment is the critical factor. If the moss isn’t reached, it will re-grow rapidly and if a passive treatment doesn’t actually eliminate it, you invested in a service that becomes very costly due to rapid regrowth. Active treatments last!
Cleaning without a treatment guarantees you’ll have moss back almost immediately. Removing moss and algae by simply removing what you can visibly see is like snapping weeds off at the surface. Spores and bacteria reproduce in the millions and travel by rain, wind and growth.
Misrepresented “Effectiveness” of 3,4., even 5 years MOSS FREE. Some cleaners in order to “win” jobs make claims that their “ttreatment” will last ridiculously long periods of time. The fact is treatments, just like wax on a car, have a lifespan. New debris and weather are a huge factor. Much of the “moss free” condition after a cleaning is complete is due to the fact the cleaning removed much of the spores and fungus…and roof life if they used one of the above methods. Debris needs to be removed regularly and fungus, spores and bacteria needs to be re-treated. This will stop its growth.
Pressure washing & uncertiﬁed “Air wash” methods! Loose claims of “Gentle” cleaning can permanently damage seals, and strip valuable years of roof life!
Dangerous or ineﬀective treatments that ruin your roof, damage your home, or worse, do nothing and leave you, your roof and your ﬁnances at RISK.
A service with Calibrated AirWash Roof Systems™ or water wash systems when requested, recommended by rooﬁng manufacturers and designed for ACTUAL gentle, thorough cleaning, plus treatments Dangerous to Moss, Not Your Roof!