After attending the Huge Convention, we decided to get into roof cleaning as a lot of homes in the area are in need.
This is only my second roof. The first one turned out really nicely. I’m a little concerned about this one. It almost looks worse than before to me. I am using a SH 12.5 mix recommended on powerwash.com. Spraying directly from a tank, no rinse.
Am I doing something wong? Does the mix need to be hotter? Would rinsing help?
What’s your mix ratio? Make sure your SH is good and you need to be at 3.5 - 4% net of a roof like that. It will clean up easily. Not even super dirty but that looks like a before pic. If that’s an after pic, then why did you leave it. You should see a significant difference in less than 10 min. If not respray and/or bump your mix up and respray. It’s not rocket science.
To weak… that dirty of a roof you need to be 15 gallons sh to 20 galllons of water…(might need more mix). Spray…wait ten minutes…spray bad areas again. Leave, let rain take care of it.
Within 10 mins the roof should look nearly 100% new but with a slight tinge to them. That tinge will rinse off. Any dark areas should be hit again. If you have doubts it will rinse off, hit it again. Don’t want to have to make another trip out