ᐅ Horizontal crack in interior plaster of a newly built house

Bookstar schrieb:

Sorry, but what are you talking about? Did you even look at the picture?

Yes, I did. These are typical settlement cracks/shrinkage cracks. They can appear even years later. I’ve seen this in hundreds of houses and unfortunately also in my own...

Bookstar schrieb:

Why shouldn’t you fill cracks with acrylic?

Because neither acrylic nor expanding foam is a cure-all—except for amateur DIYers. There are appropriate applications for these materials, and settlement cracks are not one of them. You can’t even get the acrylic properly into the crack to fill it. If you want to do it correctly, you need to widen the crack (chiseling it out), then properly fill it with filler, sand it smooth, and finally paint over it.
The acrylic blob you try to create will always be visible and will annoy you.

Acrylic is recommended for settlement cracks and this is also stated on the products. It fills the cracks effectively and looks good visually.

I agree with you on two points: waiting until everything has settled a bit, and secondly, your approach of chiseling out the crack and replastering or filling it would be the best method. However, it is also very labor-intensive.