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Posted by on August 11, 2006, 11:39 pm
Chris Porro Email List wrote:
> question is in caps below:
>
> realizing that waterproofing can be tricky i wasn't going to trust
> myself to diagnos the troubles in my basement. didn't want to remodel
> and find out during rainy season i was wrong. so i called in a company
> here in the San Francisco Bay area to consult. This company only does
> waterproofing. They recommended xypex concentrate for my problem. (I'm
> on a hill with part of the basement below grade. I have some seepage
> and moisture in the rainy months. the runoff is good around the house,
> but apparently hydrostatic pressure is forcing water up through the
> holes left from forms. yes, they didn't fill these and they go right
> down into earth)
>
> $800 in consulting fees later, i'm now in the prep stage. xypex
> requires a porous surface free of non-concrete materials. apparently it
> seeps into the porous exposed concrete and forms crystals.
> unfortunately i discovered that parts of the 18" foundation wall were
> covered with plaster.
>
> ITS SEEMS I NEED TO FIGURE OUT HOW TO REMOVE THE PLASTER FROM THE ROUGH
> CEMENT. IT HAS PLENTY OF LITTLE CAVITIES. ITS ABOUT 60 SQ FT. ANY
> IDEAS?
>
> i've thought about sandblasters (until i started reading about the
> dangers) and grinding wheels with wire brush attachments.
>
> much thanks
Assuming the plaster was simply screed onto the unfinished concrete
wall, it may be possible to bash it with a hammer and use a hammer and
putty knife to remove it from the wall. When the bulk is removed brush
down the wall, and vacuum it .
Pressure wash or sand blast to provide a very clean surface.
I assume you have somehow plugged the holes left from the forms. If
thats where the water was coming in then thats what has to be sealed.
Depending on the size a hydrostatic cement might be appropriate. Thats
a type of cement which expands when it dries.
I would call a cement contractor for a quote.
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