I'm in the process of tearing out the recreation room in our 1960s house. The entire basement is currently furnished with needle-punched carpet and paneling on the walls. All this is coming out so I can see what the walls look like behind it. The previous owner mentioned a basement flood from a few years ago. The remedy was to saw off all the wood up about 100mm from the floor. Now that I'm tearing things down, I'm finding wallpaper on newspaper directly on the concrete. In some places, there has been quite a bit of growth in the form of black mold. This is all being ripped out as I go, but what you can notice is that about 200mm up from the floor, the plaster is crumbling, likely due to the moisture from the flooding but possibly also from moisture movement from the concrete slab.
Once the room is completely stripped, it's time to work on the walls and ceiling. We are considering plastered walls painted with some breathable silicate paint. Tiling on the floor and potentially covering the ceiling with some form of moisture-resistant drywall. I will also build a duct for ventilation and lighting along the walls, which will use steel studs and moisture-resistant drywall.
The question is what measures I need to take with regard to the wall preparation. I assume I have to knock out everything loose and where there’s a hollow sound. But can I start plastering and patching up, or what is the best course of action?
And what should I use for mortar? I don’t know what it is plastered with currently.
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