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The best thing to do when asbestos is about is to leave it alone. Check out this article I wrote
I got your message, but still figuring out how to respond in that fashion as its lost in web land somewhere. So I will respond here.
Power washing of asbestos wall tiles can be done, but its condition must be considered first. If there is fraying on the edges of the tiles, the answer is no. If the tiles are in really good
I would suggest to err on the side of safety. There are several great cleaning systems that you can purchase from the big box stores that utilize your garden hose and some cleaning chemicals that you may want to try first.
If your thinking about cleaning to prep for painting, a good scrubbing with a pole brush will work fine as well.
Just remember the asbestos that is in these shingles is a bit different then that on pipes. It was used as a binding agent to hold the singles together. Unless you scrape, drill or destroy the shingle the asbestos pretty much stays were it is. With power washing you are removing a fine layer of material that could expose these fibers making them a bit more dangerous. But as long as you have a good quality coat of paint on them, they are safe around people and pets.
I would however be more concerned about lead paint in the soil. The older shingles many times were painted with white lead and oil paint that chalked as it weathered. This chalking contained lead which would washed into the soils surrounding the house. You should not allow your children to dig or play right next to the house, nor should you plant your veggie garden in that location without first having the soil checked for lead.
This can be done by taking a few samples of the soil and placing it in a plastic bag and send it to any of the several hundred labs all around the country. Each test will run around $30 or so. Be sure to mark where you took the samples at on each bag so you know where the results are from.
You can also ask the lab to check for asbestos in the soil as well if your siding is in poor shape and is falling apart.
Hope this helps you out.