The Roof Cleaning Institute Of America Training & Certification Forum
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 Give us an idea what is alot lets say you spray 40 or 50 gals how much run off are you getting, if you have gutters you should beable to tell, a garden hose nozzle will work almost anything will but its the operator that controls the run off, alot has to do with your type of pump ,nozzle and you the operator

There is technique to spraying a roof for sure. Very little runoff is obviously the goal,...but it comes second in importance,...... total and complete coverage is number one as far as application goes. Using the proper nozzles along with enough surfactant and a good technique will get you good results. There is always gonna be runoff, so don't panic about that.
To further prevent runoff, make sure your first coat is fairly dry before application of the second and even third coat. Spraying a wet roof whether it be ain dampened or dampened by the mix will always create excessive runoff and it's not as effective anyhow,..so it's basically just wasted product.


Jeff