Hello, we have a precast concrete basement installed. I have now checked at the hardware store what materials I need for sealing the joints and for the basement living areas.
The plan for all joints is: apply an adhesion primer to the joints and fill them with concrete filler – then sand the walls.
I will leave the technical room and storage room as they are or simply paint them.
For the three living rooms, after sanding, I will apply a full-surface layer of Rotband finishing plaster and then sand it. Do I need to prime before that? After plastering, I will sand again and then paint (without additional priming).
What do you think, does this sound right?
The plan for all joints is: apply an adhesion primer to the joints and fill them with concrete filler – then sand the walls.
I will leave the technical room and storage room as they are or simply paint them.
For the three living rooms, after sanding, I will apply a full-surface layer of Rotband finishing plaster and then sand it. Do I need to prime before that? After plastering, I will sand again and then paint (without additional priming).
What do you think, does this sound right?
Hello,
A primer is always recommended for concrete. "Precast concrete basement" probably means you have so-called semi-precast walls with a cast-in-place concrete core. These have a very smooth surface, so I would advise against sanding them if you only plan to paint, as sanding can damage the surface texture.
For rooms where you want to apply a full-surface skim coat, I recommend using a full-surface bonding agent designed for gypsum-based fillers and plasters. Otherwise, you might experience adhesion problems due to the very smooth surface.
A primer is always recommended for concrete. "Precast concrete basement" probably means you have so-called semi-precast walls with a cast-in-place concrete core. These have a very smooth surface, so I would advise against sanding them if you only plan to paint, as sanding can damage the surface texture.
For rooms where you want to apply a full-surface skim coat, I recommend using a full-surface bonding agent designed for gypsum-based fillers and plasters. Otherwise, you might experience adhesion problems due to the very smooth surface.
Hausner schrieb:
We have a precast concrete basement. I have now checked at the hardware store what materials I need for sealing the joints and for the basement living spaces. Jann St schrieb:
“Precast concrete basement” probably means you have so-called semi-precast walls with a cast-in-place concrete core. But what exactly is the issue here? I assume it concerns the corners where the interior walls meet the exterior walls. I would expect these interior walls to be load-bearing precast concrete elements as well, but non-load-bearing walls might be made of calcium silicate bricks or similar materials. Different materials would require consideration regarding the flexibility of the joint sealing. Since the question can receive expert answers like from the previous poster, in my opinion it would be worthwhile for the questioner to provide such details right in the original post.
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