Tile on tile in a basement?

[Ebbe Eriksson]

Hi!
I'm considering taking the easy route and laying new tiles on the existing tiles in the laundry room in the basement. Since it's a basement, it's important that the slab can "breathe" through the grout lines. If I lay new tiles, will it breathe through the grout lines of the bottom layer and then through the grout and out through the grout lines of the top layer, or do I risk sealing it too much?
It might be a bit convoluted, but I hope you understand what I mean.

 

[BirgitS]

It sounds like an increased risk for the floor not being able to breathe sufficiently later, but whether it will be enough or not depends on the amount of ground moisture there is.

 

[Ebbe Eriksson]

It sounds like an increased risk that the floor won't be able to breathe sufficiently later, but whether it will be enough or not depends on how much ground moisture there is.

How much ground moisture I have, I don't know, I don't have anything that directly indicates it would be particularly moist, but after all, it's an uninsulated slab. Do you know what problems might arise if I still lay tiles on tiles? I think that any moisture should still find its way up but perhaps I'm thinking wrong?

 

[Sittställning]

The glazed surface is more dense. I would say it depends on what kind of tiles you have and will have. Size, grout width, etc.

Tape plastic wrap over 1m2 and you'll notice how much moisture you might have.

 

[Ebbe Eriksson]

The glazed surface is more dense. I would say it depends on what kind of tiles you have and are going to have. Size, grout width, etc.

Tape plastic wrap over 1m2 and you'll notice how much moisture you might have

But what can go wrong if the floor doesn't breathe enough, what will happen? I have plastered walls so the moisture should seek there, or can I expect another phenomenon?

 

[Sittställning]

But what could go wrong if the floor doesn't breathe enough, what will happen? I have plastered walls so the moisture should find its way there, or can I expect something else to occur?

Bubbling paint on the walls, I would imagine.

I've got the impression that it's best to let the floor breathe as much as possible. Then it all depends on how much moisture movement you have. All houses are unique.

 

[BirgitS]

I would imagine bubbling paint on the walls.

Also the plaster coming off.

 

[Sittställning]

Yes exactly, it's better the hike is on the concrete floor simply.

 

[Ebbe Eriksson]

Okay, thank you so much for the answers!