preventing mold with plaster

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larkasaur

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Hi,
My house has living space below-grade with concrete block walls. Currently covered with drywall.
The concrete block wall probably isn't leaking or cracking. At least, looking at part of that wall which is not covered with drywall, I don't see any sign of leaking or cracks.
But, moisture comes in at the bottom of the wall when it rains. It's not wet like a shower, but the grout in the tile floor is darkened from moisture seeping in. And every few years when there's a very heavy rain, water can literally come up through the tile floor.
I don't think the basic dampness problem is going to be fixed. That wall is not going to be safe for drywall, whatever I do.
So I'm inclined to take the drywall off and plaster the concrete blocks.
It's super-important that the wall not grow mold, because I'm allergic. I have a dehumidifier in there, and that discourages mold on exposed surfaces.
So what kind of plaster should I use for this? I saw online a waterproofing additive that can be added to cement plaster. They say that with the additive it won't grow mold. And I read that lime plasters like Tadelakt can be waterproof. If the Izonil waterproof plaster that I linked to is available from other sources, please let me know.
I'm a totally new at plaster. But I'm patient. The area I'd be plastering is roughly 100 sq ft. I'd like the wall to be nice and flat, but if it doesn't come out good enough I could tile over the plaster.
thanks
Laura
 
Yes, like I said the wall is below-grade, that means below ground level. No, as I said I don't think the moisture problem will be fixed enough to make that wall safe for drywall.
But, what I wanted to know is, what kind of plaster is reasonable for this? Izonil sells their waterproof plaster for below-grade walls, which can have moisture problems. Does anyone have experience with cement plaster with a waterproofing additive? They don't say exactly what's in the additive, but they told me it doesn't have anything organic that can mold (it's probably some kind of plastic). My wall does not leak so far as I know, except at the junction between floor and wall.
If plaster isn't a great answer, I could use cement tile backing board and tiles.
Laura
 
You need to tank the room out, whatever plaster you use will fail one way or the other unless you stop the water penetration, where actualy are you?
 
you need 2 contact a preservation company iv seen them use plastic sheeting plugged into the wall so the water doesnt come throo the wall but runs away at the bottom the plastic is then plastered over like plasterboard
 
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