Base tiles or plaster first

For organizational reasons (because you can't do anything outside at the moment), I wanted to tile the garage. Now, the interior has not yet been plastered. Therefore, I wonder, should I better omit the base tiles, only make a joint between the floor tiles and plaster if plastering is done later, and then stick the base tiles onto the plaster, or could the base tiles already be glued onto the wall and the plaster then be applied flush?

Hello "Peanuts74". The problem is technically correct and also easy to solve. In this case, lay the floor tiles with a gap from the wall corresponding to the later plaster thickness. Now the floor is fully tiled, and (too late) the plasterer arrives. He has to cover the existing tile level completely (!!) and, secured with (Krepp tape against unintentional position changes), places a 6 - 8mm thick screed setting strip along the wall directly on the floor next to the wall to be plastered. Now he applies his wall plaster and "sets" it at the bottom on the setting strip. Once the wall plaster has hardened and the wall or even just the base tiles are fixed, the setting strip is completely pulled out along the wall surfaces. The joint space between floor and base tiles is thoroughly vacuumed with a strong vacuum cleaner, then a round cord is pushed about 5mm deep into the joint space (in fact, it is no longer visibly "recessed" from outside) and then an elastic jointing is applied between the base and floor tiles as a triangular joint. That’s how it works! ------------------------------------ Regards: KlaRa

So the base tiles definitely later, am I reading that correctly? It is clear that there must be an expansion joint between the floor tiles and the plaster, but is it "bad" if the tile goes up to under the plaster? Can the swelling strip also be placed on the tile to ensure the distance?

Hello "Peanuts74".
Base tiles are generally always installed last in the standard procedure after completion of the floor and wall tiles (if present). In your case, however, you indicated time difficulties between the trades "tiling and plastering work".
That a floor tile extends up beneath wall plaster is not the rule. Usually, the wall plaster is already in place when the floor tiles are laid. Considering the special situation you described, however, it can be done as I described without fearing any disadvantages in execution.
(Quote)
"Can the expansion strip also be placed on the tile to ensure the distance?"
That's exactly how I wrote it!
It is also not an expansion strip, but a setting strip. Because something is being set down here.
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Regards: KlaRa

One more question, in the storage room in the basement I had plasterboard sheets glued to the wall and filled. Would this, of course with the green, impregnated sheets, also work in the garage? It is a garage and does not have to meet the highest aesthetic standards, whereas the storage room looks very appealing. I would also like to add that it is a basement garage located within the thermal envelope, but is not heated itself. However, other rooms in the basement are heated, so even during the cold temperatures of the last few days the garage is always at least about +10°C. The garage also has a window, but in winter it is usually closed. The question is whether the moisture brought in with the car is so high that the plasterboard sheets are damaged or if there are, for example, special paints for this case.

Hello "Peanuts74".

In case it is about thermal insulation:
They are generally attached to the cold (therefore the exterior) side of a building. Interior insulation can only be the exception!
A temperature of +10°C in a garage means that the vehicle fleet stored here is not exposed to frost and temperatures below freezing point. Thus, important aspects of a winter requirement for a garage are fulfilled.
Condensation, by the way, only occurs when warm, moisture-laden air meets a cold surface and the dew point is undershot at the contact surface.
Construction auxiliary materials (and I assume that "plasterboard" is one of these) may only be used according to their intended purpose. This information, in turn, can be found in the corresponding product data sheet.
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Regards: KlaRa