Exterior insulation Porit aerated concrete block - carried out simultaneously?

Hello everyone,

we are currently building a house with solid construction (Porit aerated concrete). Starting tomorrow, the interior will be plastered.
Now a friend said that the exterior plaster must be done simultaneously or shortly after the interior plaster. This is necessary because of diffusion with this stone. Unfortunately, I can't find anything about this anywhere. Is this statement correct?

Thanks for your information in advance.

Hendrik

Aerated concrete absorbs water. In rain. That is why the exterior protection is so important. So if plastered inside, one really should not wait so long before sealing outside. Otherwise, the inside will become crumbly again.

Thanks, makes sense. I have to keep that in mind.