ᐅ Should precast concrete ceiling panels be simply skim-coated and sanded, or covered with fleece?

Hello everyone,

do you have any experience with joint filling on precast concrete slabs? A friend said he wouldn’t do it because cracks tend to appear sooner or later. Instead, he had fleece laid over the entire surface. So, first just roughly filled and sanded, and then a fleece applied over the whole ceiling.

What experiences have you had with this?

Please let us know.

Best regards

A fleece membrane was applied extensively over the joints and the holes for the ceiling spotlights. I find it hard to believe that this would make sense for the entire reinforced concrete ceiling.

Extend the pores of the ceiling lengthwise, do the same with the joints, apply filler, and smooth it out over a large area.
Cracks can form and will not be permanently concealed by fleece. I personally think it looks good only as described above and painted. But that is a matter of personal preference. With the fleece, the remaining pores are no longer visible.

Regards

Our concrete ceilings are not "skim coated." However, I can't say exactly what the painters did. In any case, the ceilings are very smooth, and after nearly four years, we have not noticed any cracks.

In our old house, we also had a prefabricated ceiling panel with the usual wooden ceiling screwed on top.
During a renovation, the joints of the ceiling were filled with filler. It’s important to note that you shouldn’t just fill the joints but also apply the filler more broadly around the joints, since ceilings usually don’t sit perfectly flush to the millimeter.
I might also consider embedding a suitable mesh at the joints, but in my opinion, fleece is not necessary. After that, the ceiling can be primed and painted, or—as we have discussed multiple times here—a textured paint can be applied; that works well!

pagoni2020 schrieb:

Applied the multi-discussed skim coat here; it fits well!

Is this something used for finishing drywall, like Knauf Easyputz?

Yes, using something like that to paint the ceilings would also be an alternative, so you wouldn't have to fill every tiny hole in the precast concrete slabs individually.