Concrete cleaning and gum removal is probably the most widely done portion of pressure cleaning industry with year round commercial focus .i think it would carry more weight to be showing other businesses,franchises ,property managers a organizational certification with a focus towards concrete . Showing a residential person a certifcation doesn't do much but it helps .Why focus on wood and roofs ? A Wood certification is too ambiguous. 40 degree tip ,under 1000 psi ,practice your golf swing and your certified!Wood takes much longer than any other Pressure cleaning specialty to get a handel . You can bundle basic house washing , basic roof cleaning, and basic wood cleaning under one certification . How to use bleach !When you go to a house that's whats there?sealing is too product driven to have a certification. Some products have certifications to use them anyway.
I think you'll gain a better and faster reputation focusing on business to business .Instead of the residential market. Experience has value in the residential market .
Funny story. My wife is working on my web page and she goes what is the RCIA. She was doing research then I explained how you got your certification.
Ill take the wood test.