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[Kallskuret]

Hello. I have rebuilt our "pizzeria arch" that was in the living room when we bought the house. I have made a traditional "square opening" and am now going to buy door frames.
The framework used is 45x70 and 10mm chipboard. So the opening is 90mm thick.
Now to the issue, the only door frames I find are 80, 95, 110mm.
Aren't there any in 90mm? What would you have done?

 

[Stefan N]

You shouldn't cover the chipboard with plasterboard? Should have gone with 95 as it's nicer for it to be slightly uneven rather than completely even with the boards if you're not going to have molding.

 

[Kallskuret]

You aren't going to cover the chipboard with plaster? I would have gone with 95 as it looks nicer to have it overlap a bit rather than being completely even with the boards if you're not going to use trim.

The walls are wallpapered so that's not an option, unfortunately. Trim, however, will be used.

 

[Aunty]

The walls are wallpapered so that's unfortunately not an option. However, trim will be used

you install trim that is 80mm, extend on the recess and then install the casing

 

[Kallskuret]

you mount a scope that is 80mm, mount on the reveal and then install moldings

I don't quite understand what you mean. The opening's width is 90mm. 2 chipboards and a stud. How do I mount a scope that is 80mm then?

 

[Aunty]

you install it so it aligns with the wall from one side. On that side, just install the trim as usual.

on the other side, you install a lining of 10mm +- a few mm, the wall is probably not straight.
then you install the trim against that as usual.

 

[Kallskuret]

you install it so it's flush with the wall from one side. On that side, you just install trim as usual.

on the other side, you install a salning of 10mm +- a few mm, the wall is probably not straight.
then you install trim against it as usual

Aha! Thanks for the tip. But as I understand it with the casing I've found, the corners are rounded, which would make for an awkward joint

 

[Daniel 109]

Alternatively, you take one at 95mm and plane down 5mm. Or adjust the error so it isn't visible when the trim is in place.

 

[Aunty]

Aha! Thanks for the tip. But as I understand it, with the molding I've found, the corners are round which would make a strange joint

you pull the molding a bit into the coverage so you get a guide.
looks much nicer, it's hard to make something look good if they align exactly.

 

[Aunty]

Or you can take one at 95mm and plane it down by 5mm. Or adjust the error so it's not visible when the casings are in place.

or use a klackfoder, there are many solutions