I have a customer with a 10k sq ft cedar roof… HEAVILY infested with everything you could imagine that would grow on the roof. To the customer, cost isn’t the issue. First things first… let’s talk chemicals and cleaning methods.
I have done tons of research, seen what Sullivan does on his roofs (great work), watched videos, read articles about cedar. I don’t want to use SH on the roof since I don’t want to bleach the shingles and def do not want to put pressure on it. I want to clean the shingles with chemicals and water pressure. I can get industrial TSP (Trisodium phosphate), Sodium Percarb, and Sodium Hydroxide from my supplier. I totally agree with Sullivan on not putting pressure on the roof and instead, use your 12v to apply chem AND rinse with water. I will be using ladder stand off’s (dont’ know what they’re called) so I can lean to the roof and not walk on it. Shingles can compromise if you don’t lift your foot when you turn, cedar can snap or worse if you aren’t careful. My goal is to mix my powders at the proper ratios and wash with my mix. I know Percarb is good for roofs like this, but just want to make sure that someone out there may be able to guide me a bit more as far as ratios, chemicals, and methods. Also, I want to do a brightener with oxalic acid after cleaning. Using an oil seems to not be necessary since the oil may or may not soak in, and probably doesn’t extend the life of the roof any. I may be making this a bit harder than what it is, but I really want to do a good job for this customer. Especially if I’m charging around $.80 a sq ft because of the infestation. Thank you all for your knowledge and support. Look forward to hearing from you.