I have a property that had a wet basement wall for years. The source of the
water has been fixed, and I plan on applying UGL or similar water-proofing
coating. But I'd like to clean the surface of the white scaley stuff. The
fluffy white efflourescence wipes or hoses off, but some of the white stuff
appears more stubborn (doesn't appear to be affected by wire brushing, etc).
Don't want to use any kind of calcium dissolver, as I'm afraid it might
damage the concrete block.
<< I'd like to clean the surface of the white scaley stuff. >>
<< some of the white stuff appears more stubborn >>
The coating you plan to use may cover the stubborn stuff just fine, but if you
decide to get rid of it an abrasive removal scheme might work. A bargain spot
type sandblaster from Harbor Freight or similar could do the job and minimize
clean up. If the area is so extensive that this is impractical. then coat a
small area with UGL and wait to see what happens in a few months. It might be
worth a phone call to UGL customer service to learn if they have
ideas/solutions to this problem. HTH
Maybe a pressure washer? Say, one capable of about 2500 to
3000 psi & a wand with. say, a 15 degree fanout on it? That
way it's only water and not a lot of water at that. I used
mine to take paint off the garage floor & it worked fine as
long as you keep track of what you're doing. If you aren't
careful those bigger ones make great posthole diggers!
No matter what you put on the walls, you want to put it on the concrete
not the stuff that is on there now. You can try a power washer, but in the
end I suspect you really should use Muritic acid. Be careful and you will
feel a lot better about doing all the work knowing you did it right rather
than quickly only to find out that you need to do it over and this time it
will be even more work to get the UGL off first.
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