ᐅ Cracks in the corners of drywall ceilings

In my parents’ new build (bungalow), almost all the ceiling corners have cracks. The cracks look fairly straight and are present both between the drywall ceiling and solid masonry, as well as between the drywall ceiling and non-load-bearing gypsum walls.

I believe these are settlement cracks. I’m not sure if a separation tape was used. I would like to fix this cosmetic issue.

Is acrylic a better option for this, since it is elastic but tends to yellow, or would lightweight filler be more suitable? Generally, filler compound is not ideal, but the lightweight filler from Pufas is said to have high flexibility.

In my own house, built by the same developer, all the baseboards sealed with acrylic have cracked. I resealed them myself using Otto Seal; there were no cracks but the typical yellowing occurred. About a year ago, I discovered the lightweight filler and tested it on a baseboard. So far, no cracks or yellowing have appeared.

Acrylic has the advantage of being paintable. However, in terms of durability and elasticity, it is inferior to silicone. What is planned for the walls? Wallpapering, textured plaster, or just painting?

The walls have already been painted. Who mentioned silicone? The lightweight filler can also be painted over.

Coletrickle_7808 schrieb:

I tightened these myself with Otto Seal,

I like to use Ottoseal M360 for such cases. It has not turned yellow so far.

I think the "demolition lines" look very fine and would rather consider smoothing them out again with a knife cut and leaving them as a shadow gap. Or, if it’s not perfectly straight everywhere, then consider adding a decorative trim, because no matter what you use—acrylic or lightweight filler—it will always crack again.

With an intentional joint or decorative trim, you won’t have any issues.

Attach the separating tape first and then create the false joint.