Hydro-Pro Power Wash Report post Posted May 18, 2014 I recently had the experience where I sprayed a roof with the "quick apple sauce" and the algae changed from dark to yellowish. Am I expecting too much too soon? I'm still very new at this no-pressure roof cleaning, and get hinky when a roof doesn't look clean when I leave a site. Please help. Thanx. Share this post Link to post Share on other sites
Stay Clean Report post Posted May 18, 2014 I had this same question when this first happened to me. I mostly have this problem with shingle roofs. All you have to do is spray the roof again. Usually it takes 3 coats if its really dark to get it completely clean. On occasion I've also had to rinse the roof because it can leave an orange tint behind. I put in some pics as an example to what you're describing. Share this post Link to post Share on other sites
Sussex County Roof Cleaning Report post Posted May 19, 2014 It will clean up with a couple good rains. I would suggest a stronger mix next time when the roof is really black. When I leave all the black is gone. I run 20 sh to 35 water mix. What ratio mix did you use,looks weak Share this post Link to post Share on other sites
Stay Clean Report post Posted May 19, 2014 20 sh 30 h2o, supplier goes through 1500gal a week, not weak mix or sh. I've never had any black roof come clean with just one application. At least two coats and some touchup spots after that. You could spray straight sh if you wanted a stronger mix but I wont. It will not clean up with a couple good rains if the roof is left looking like picture #4 above because you haven't completely killed all of the GM. All the black is gone when I leave also... picture #5. Share this post Link to post Share on other sites
Hydro-Pro Power Wash Report post Posted May 19, 2014 Thanx for the help guys. I use the 2:3 ratio. How much time is normal between applications? Minutes, Hours, Days? Thanx also for the encouragement. I'm not alone. Share this post Link to post Share on other sites
Stay Clean Report post Posted May 19, 2014 At that ratio the mix should foam up and start working immediately but I give it minimum 10 mins; 15 if shady or cool (don't usually have that in s fl). By the time I spray the whole roof I can go back to where I started and repeat. I did a shingle roof last week that was completely soaked from the rain as I was setting up equipment and it still worked as normal. Share this post Link to post Share on other sites
Advantage Roof Cleaning Report post Posted May 19, 2014 After we apply the first coat over the entire roof, the spray technician will apply additional coats over the heavy spots until they are completely gone. We also inspect the roof from the ground to make sure all spots are gone. Share this post Link to post Share on other sites
Central Iowa Roof Cleaning Report post Posted May 19, 2014 That's why I rinse all roofs. Instant results. 2 Apple Roof Cleaning (813) 655-8777 and Whirled Peace Powerwashing reacted to this Share this post Link to post Share on other sites
Hydro-Pro Power Wash Report post Posted May 21, 2014 So it's like shampooing, "Lather, wait, repeat (if necessary)." Share this post Link to post Share on other sites
DIRTY-ROOF.COM Report post Posted May 21, 2014 Thanx for the help guys. I use the 2:3 ratio. How much time is normal between applications? Minutes, Hours, Days? Thanx also for the encouragement. I'm not alone. I always use 20 gallons of fresh SH with 40 gallons of h2o. Roughly 33% SH Very easy to do the math. whatever amount of SH I use i add double the water. If im running low during a cleaning i can easily add more to the tank without changing the strength. For me the yellow lichen is the worse and we have lots of it! takes a few application and some waiting for it to whiten up. The heavy black algae stains take a few coats also. The roofs are clean when we leave and we dont rinse. If it looks similar to picture 4 above then it needs another application. 1 Apple Roof Cleaning (813) 655-8777 reacted to this Share this post Link to post Share on other sites
Apple Roof Cleaning (813) 655-8777 Report post Posted May 21, 2014 I always use 20 gallons of fresh SH with 40 gallons of h2o. Roughly 33% SH Very easy to do the math. whatever amount of SH I use i add double the water. If im running low during a cleaning i can easily add more to the tank without changing the strength. For me the yellow lichen is the worse and we have lots of it! takes a few application and some waiting for it to whiten up. The heavy black algae stains take a few coats also. The roofs are clean when we leave and we dont rinse. If it looks similar to picture 4 above then it needs another application. Always remember, the mix is Yellow, and shows up on a light colored roof when it dries. Share this post Link to post Share on other sites
Sussex County Roof Cleaning Report post Posted May 23, 2014 20 sh 30 h2o, supplier goes through 1500gal a week, not weak mix or sh. I've never had any black roof come clean with just one application. At least two coats and some touchup spots after that. You could spray straight sh if you wanted a stronger mix but I wont. It will not clean up with a couple good rains if the roof is left looking like picture #4 above because you haven't completely killed all of the GM. All the black is gone when I leave also... picture #5. I get mine in one good heavy coat. Always check afterwards. Share this post Link to post Share on other sites
Hydro-Pro Power Wash Report post Posted May 23, 2014 I remember as a kid a that my dad used to bring home retired work motivational posters, and one read "Measure twice, Cut once." My new maxim, when it comes to roof cleaning is, "Inspect twice, set your ladder ONCE." Thanx for all the help on this guys. Have a great summer. Share this post Link to post Share on other sites
Apple Roof Cleaning (813) 655-8777 Report post Posted May 23, 2014 I remember as a kid a that my dad used to bring home retired work motivational posters, and one read "Measure twice, Cut once." My new maxim, when it comes to roof cleaning is, "Inspect twice, set your ladder ONCE." Thanx for all the help on this guys. Have a great summer. LOL, "rinse well, replace plants never" 3 Whirled Peace Powerwashing, Ultimate Roof Cleaning & Pressure Washing and Philip McCullough reacted to this Share this post Link to post Share on other sites