replaster basement walls after drainage

[berne88]

I painted all the walls in the basement last year. It's been almost a year now. But the moisture came back, so now I've hired someone to drain the house again. But the walls aren't completely smooth, they're a bit "bumpy," so I've thought about plastering two rooms, at least to start with.

Since I don't really know what's behind the existing plaster that's there now, my plan is to just apply a thin layer to get smooth, nice walls.

I've looked around a bit and got an idea of how to set up the work itself, with plastering and so on.

But should I go for Weber plaster or Finja? And which one? I want it almost as smooth as possible, nice if there's a little bit of texture.

 

[anders07]

If it's just a thin layer you need to plaster and there isn't much moisture, you can apply gypsum plaster. Easy to work with and can be applied thinly.

 

[berne88]

If you're only applying a thin layer and there's not much moisture, you can use plaster. It's easy to work with and can be applied thinly.

Hmm, because it's going to be all the walls covered, does it let moisture through?

 

[släggan78]

Use plaster C hand up to 1 mm. I personally think it doesn't matter much if it's called weber or finja. I buy at Bauhaus and it works great.

 

[AndersS]

If you still have paint on the wall, gypsum plaster/mixture+primer is preferable and just as easy as filling. If it's only a few mm, you can make it even simpler by using coarse filler, which is slightly more expensive but marginally. If it's a bare concrete surface, you can also use plaster mortar C. It requires a bit more work to apply and technique to make the mortar stick.

The purpose of re-draining is to get a dry exterior on the outer wall to eliminate moisture and preferably an insulated exterior so that any moisture migration is directed outward. With a properly constructed outer wall and drainage, you should not have any moisture in the wall, and all three methods above should work.

 

[berne88]

it is difficult to say how thick I will lay, but if you play around a bit we can say 1-7mm so I have some room to maneuver, does it work quickly with something like plaster?

AnderS what do you mean by grocspackel?

 

[AndersS]

it's hard to say how thick I will apply it, but if you play around a bit, we can say 1-7mm so I have a little flexibility, does it work quickly with something like gypsum plaster?

AnderS what do you mean by grocspackel?

A common coarse hand putty, might be called coarse hand putty or something similar. Can be applied in layers up to 10-15 mm. It becomes a broad spatula application on the wall. If there are bigger uneven surfaces, gypsum plaster/render is better as it can handle 40-50 mm, but also works excellently in thin layers.