Can you apply a sealer that will keep the fungus from returning?
We are pleased to say both the tile and shingle manufacturers have approved a product called Roof-A-Cide that will not void your warranty with proper application (we are an authorized applicator of Roof-A-Cide ) and is Guaranteed not only by us, but also by the Roof-A-Cide company for a minimum of 2 years.

Roof-a-Cide is a Green Product that is EPA approved, non-toxic to landscaping or the environment. Should you decide to utilize Roof-A-Cide we offer a discount on your final roof cleaning. If your roof is new (tile or shingle) or we determine it does not need a cleaning we can apply immediately and therefore preventing the need of cleaning. The advantage of this product will help eliminate wear and tear and repeated full cleanings of your roof. For more information about Roof-A-Cide CLICK HERE . In addition, at this time, (according to the manufacturer www.monierlifetile.com ), to their knowledge, there is currently no known life time products on the market that keep fungus from returning.

Shingle roofs may have copper oxide in the granules that effectively discourage fungus for approximately 5-7 years. (See FAQ #5 Can a shingle roof be cleaned without damaging it?) We can also apply the Roof-A-Cide product to guarantee fungus will not return. The advantage of doing so will extend the life of your shingle roof.

Some pressure cleaners put pool algaecides or additional chlorine (potentially damaging) on after cleaning the surface. We find minimal if no success in most circumstances with these procedures.

Exteriors can have a special algaecide added in the paint that probably will help.