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Strategies  For Ongoing Moss Infestation Control and Avoidance

There are many reasons to engage in an ongoing roof moss control program or to target and remove problem moss from roofs. Some are related to curb appeal improvement, others may be preparatory to selling a home and surprisingly it can be due to demands by insurance companies. No matter the reason, we should all understand that here on the ‘wet’ coast, roof moss is an expensive detriment to the longevity of most roofing products.

 A clean roof, free of debris and biologic plant life (including moss) is a roof that will last as long as most manufacturers warranted lifespan.
This roof needs some attention. Debris build-up should be controlled.
When Should Roof Moss Be Treated and Removed?
It is a bit of a strange phenomenon, many home owners do not take the time to conduct a visual inspection on their roof on a regular basis. This is a mistake. A quick inspection a couple times a year can add years of life to your roof.  
During our rainy season, November to April, roof moss will flourish and grow at an unprecedented rate. The color typically turns from a semi lifeless brownie green to rich and vibrant greenie golden color. Some people, one of which I am married to, absolutely loves this color. I admit it is very beautiful. Beauty aside, this living sponge is shortening the life of your roof and should be controlled.  
Healthy moss holds lots of water causing deterioration of your roof.


During this season it is truly easy to see how widespread any moss issues are on your roof. The vibrant green jumps out at you. It should be treated as soon as possible. All effective treatments I am aware of require 48 hours of dry weather in temperatures above freezing. This usually means May thru October are the months when the moss can be treated.


Removing roof moss from a composite roof is an activity that has a few different approaches and as many hard core opinions of what is the best methodology.
I personally believe that the least amount of physical contact there is between any tool and roofing material the better. No matter how careful one may be, if you are touching the roof in order to ‘pry’ off the dead moss damage is occurring. Causing any composite material to release from the roof is damage.
Stripping this moss from the roof takes asphalt particulate with it. Moss should be treated first.
In an effort to reduce this some companies reduce damage by isolating where they actually scrape the roof to remove moss. This may be all right for a one time removal but should not be an ongoing removal process. Other ‘experts’ will convince homeowners that a pressure washer is the best moss remover there is. Be very careful of this approach. Pressure washers will remove the moss as well as much of the composite roofing material rendering your 30 year roof a 20 or 15 year roof. Each time it is done the lifespan becomes reduced. 
The only time a pressure washer may be an option on a roof is if your have cement tiles (please consider re-sealing after cleaning) or another roofing material impervious to the degrading effects of high pressure blasting.
Once properly treated, dead roof moss will release from the roof during our natural weather patterns. Exercising patience and allowing nature to take this course is the best moss removal process when the goal is to get the most life out of your roof. Platypus can provide a ‘quick cure’ solution that we feel is the least damaging to composite roof material, but, taking the natural approach is the best.    

Ongoing Control

Roof moss should be effectively treated as soon as it is slightly noticeable. By treating your roof in this early stage you can apply an effective moss treatment, that leaves a residual coating, to 99.5% of your roofing material. This treatment will kill the moss that is starting to take hold and it will continue to create an environment that prohibits the re-growth of moss for two or three years depending on the conditions above and around your home.
Platypus can provide an ongoing moss elimination and control program designed to keep roof moss from ever developing on the top of our customer’s most valuable asset.
This is moss at the earliest stages of development. Treat it now.