Had to go back this weekend and give it another application. I treated the roof twice the first time with a 50/50 mix, we had rain but it still had some tuff spots that did not come completely clean afterwards. The roof was wet the first time I applied it because of rain the night before and think that might have had something to do with the results. It's looking great now and just thought I'd pass this on to anyone pricing these jobs.
Also, dry asbestos shingles will suck up your mix. Price it for more mix than asphalt or clay tiles and be readt to re-treat trouble spots. You can not walk these roofs because they are very brittle and it all needs to be shot from the gutter line or if your like Ray (Spray Wash) a crane!
This is a dramatic before and after but pictures don't show the real world look. There are some areas on the ridge line and on the hip. No pics after todays application. I want to wait for some more rain and a little sun bleaching. After that I'll take some shots and add the finished product to my before and afters on the web site.
I've done a few Asbestos shingle roofs and they are not easy, or quick. You're right about them soaking up the mix, and they certainly need a few rain rinses to make them come clean. Sometimes they will just not come clean after the first application, whether wet or not.
Don't walk an asbestos roof, don't even think about walking as asbestos roof, don't even think about thinking about walking an asbestos roof!!!!!!
Found this post from last year of one that I cleaned:
Asbestos roof cleaning
-- Edited by sweetwaterfish on Monday 27th of August 2012 09:40:01 AM
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Ray Burke
Spray Wash Exterior Cleaning
850.528.3226
visit our website Soft Washing and Pressure Washing
It's funny you mentioned ferns in that post Ray. The front roof was covered in them. I wonder what up with that? Is asbestos optimal for fern germination? Whatever the case, a week later after being doused with some luv, they were crispy critters!
The natural gaps that occur between the shingle are the perfect habitats for resurrection fern. They turn the algae and mildew that grows up there and decomposes into their own soil. The ferns can actually be more dangerous than the GM, as the root beds hold a lot of water and can get up to an inch thick!
__________________
Ray Burke
Spray Wash Exterior Cleaning
850.528.3226
visit our website Soft Washing and Pressure Washing