ᐅ Applying joint compound to solid and drywall walls and ceilings

Hello everyone,

I have the following question for clarification, as I’m getting different opinions on the construction site:
We had our interior plaster / Baumit gypsum plaster applied on September 2nd and 3rd, and on October 6th and 7th, we received the cement screed Phoenix Portland cement CEM I 42.5N on the ground floor and upper floor. Our heating system is being installed today and is expected to be commissioned by the manufacturer's technician next week.

In the past few days, I have already had all the walls and the precast concrete ceiling / concrete ceiling including joints on the ground floor skim coated (Pufamur S60 filler). I am considering having all the rooms upstairs skim coated next week before starting the heating phase (walls with gypsum plaster, sloped sections and ceiling with drywall filler).

Now to the question: how likely is it that I will encounter problems with cracks, etc., in the filler, given that in my opinion both the screed and the gypsum plaster have had enough time to dry (gypsum plaster 3 months, screed a little over 2 months) and presumably there is no longer significant moisture present, so the heating is really just a stress test for the screed? Aside from the filler itself, which is mixed with water, of course.

Thank you for your answers!

Hi, I thought so too. In my case, the already painted red lime plaster in the utility room completely cracked after the warming-up phase.

So, 3 months of drying time is not enough? Wow...