ᐅ Skipping lintels above windows?

It isn’t either. Your window installer can do that and will take care of it.

Smarti99 schrieb:

Where is it often done carelessly?
I don’t think it’s that complex.

For new construction (first installation), it is hardly complex. However, there is still a lot of carelessness, starting with ordering based on architectural dimensions—especially misinterpreting measurements for floor-to-ceiling elements—and ending with excessive use of expanding foam during installation. Just having a butcher and a cordless drill does not make someone a window installer.

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I did the same with two windows in the garage. The windows are 1.5m (4 ft 11 in) long × 0.40m (16 in), and the in-situ concrete ceiling effectively serves as the lintel.

11ant schrieb:

There is still a lot of sloppy work, starting with ordering according to planned dimensions—especially with floor-to-ceiling elements where measurements are often misinterpreted—and ending in excessive use of expanding foam during installation. Just having a butcher and a cordless screwdriver does not make a window installer.

That must be the exact answer you were looking for? Thanks for the help!

Mistakes are often made with the wall connections. This includes the membrane that needs to be plastered over or the absence of permanently elastic sealing tape.