I got up this morning to pouring rain, by 11 am it stopped so I decided to go do a roof, by the time I picked up my truck from the shop it was sprinkling again, so I decided to continue heading to the job, when I arrived at 1:30 the rain had stopped but the sky was filleed with clouds, and the roof was wet, so I decided to spray it anyway, the outside temp was around 55 degrees, thank god no rain, we were done by 3:30 and the roof looked great, it started to pour rain by 5pm, I'm looking forward to going back and taking after pictures of this job
goes to show you wet weather does not matter as long as you have a 3-4 hour window with no rain
So you use less cleaner. They get super hot in the sun. Your cleaner will dry up quick. Just like when you clean a deck in the summer. Before you apply the Sodium Per carbonate you want to wet it first to cool it down so it doesn't dry up.
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Elephant Roof and Exterior Cleaning Raleigh North Carolina David Hoover 919-207-0666 Benson NC. Roof Cleaning Raleigh NC
I used to wet the roof first on hot summer days but mid summer I stopped. We applied on a very hot roof { forgetting to wet it down } and it worked just fine.
Your theory on using more solution when the roof is really hot sure makes sense and thats why we would wet them down like yourself. After spraying without wetting it down I did not see a significant difference in usage or time. Again I did stop mid summer ish so maybe the " heat " was not as bad,so nothing was noticed. I am sure others on here must have some experiance in this area.
I think the heat may cause the solution to flash activate the sh and create more cleaning power but also cause the chlorine to release quicker. This is why I may notice more fumes in the hotter temps. I know that the blackest roofs will clean up on the first pass more likely on a hot roof. Not sure if this is actually a good thing or not as far as protecting the shingle from long term damage.