Sand filler for basement walls.

[OMLAJA]

Hello.

I have a question regarding the spackling of basement walls (indoors). Is it okay to use sand spackel? I want something that is diffusion-open and at the same time not damaged by potential moisture migration.

The walls will then be painted with some, likewise, diffusion-open paint.

Kind regards

 

[Lechuza]

No, it is not OK, filler does not breathe. There should be plaster on exterior walls and then silicate paint if you want to paint.

That said, I still want to add that I have been in many basements that have had filled exterior walls where there have not been problems, but it is not correct.

Best regards, painter

 

[OMLAJA]

No, it's not OK, filler doesn't breathe. There should be plaster on exterior walls and then silicate paint if you want to paint.

That said, I still want to mention that I've been in many basements with filled exterior walls where there haven't been problems, but it's not right.

Best regards, painter

Thanks. I understand what you're saying.

 

[Daniel 109]

No, that's not OK; spackel doesn't breathe. There should be plaster on exterior walls, then silicate paint if you want to paint.

With that said, I want to point out that I've been in many basements with spackled exterior walls where there haven't been problems, but it's still not correct.

Regards, painter

Do you mean that spackel is moisture-proof? How did you come to that conclusion? Whether it even needs to be moisture-proof also depends on how the wall is built and how the space is used.

 

[JohanLun]

There is a risk with regular filler, especially if you paint with "plastic paint" on it.

I would primarily choose some kind of plaster and paint with breathable paint, perhaps some kind of wet room or boat filler that is supposed to withstand water would work. But plaster is probably best.

 

[Lechuza]

Do you mean that putty is waterproof? How did you come to that conclusion?
Whether it even needs to be waterproof also depends on how the wall is constructed and how the space is used.

I mean that if it is damp on the outside of the basement wall, the putty will bubble and come off.

How I came to this conclusion is that I have seen it in several basements and talked to the paint wholesalers who have then said that putty does not breathe on basement exterior walls.

 

[JohanLun]

I mean that if it's damp on the outside of the basement wall, the filler will bubble and detach.

How I came to this conclusion is by seeing it in numerous basements and talking to paint wholesalers who then said that filler doesn't breathe on basement exterior walls.

I've seen that too, in my childhood home when I was a kid and in my current house where they seem to have done that in a few places.

With plaster and plaster paint, it works much better.

 

[Daniel 109]

I mean that if it is damp on the outside of the basement wall, the filler will bubble and detach.

How I came to this conclusion is that I have seen it in several basements and talked to paint wholesalers who then said that filler does not breathe on basement outer walls.

Detaching due to moisture is something completely different from not breathing.

 

[jawen]

That it releases moisture is something completely different from not breathing.

They are wrong Daniel, all sand-based fillers without plastic additives are just as good as plaster.
BUT if you use a much "stronger" filler, it can pull away from what it is applied to.

More cement in = stronger
sand is only a finer fraction than plaster, but the same "material".

 

[Anonymiserad 405730]

Common sand fillers for indoor use, such as Beckers medium, contain copolymers which make the wall quite impermeable when used extensively, preventing it from breathing optimally. Plaster does not have much in common with these fillers except for a little aggregate.