Build in window niche and tidy up inside

[FStrandberg]

The window has been gone for a long time and is no longer set in the outer wall. However, from the inside, the window niche remains as a square recess in the wall. This needs to be built over, and a TV should be mounted on the wall. How should the construction be designed, and how can I ensure that nothing is visible on the wall after the construction?

I’m thinking of using studs at the top and bottom with three vertical studs attached (dimension?). On top of these, I’ll attach double boards (plywood + gypsum?) that are not quite set level with the surrounding wall but a few mm inward so that filler can then fill in and blend the construction with the surrounding wall.

Does this work in terms of stability? Is it a reasonable way to make the window niche "disappear" into the wall?

/Fredrik

 

[norrbottenstorpet]

How is the surrounding wall constructed?

 

[FStrandberg]

Hello,
it is lättbetong.

Kind regards, Fredrik

 

[norrbottenstorpet]

Build with leca, plaster and paint.

 

[Matti_75]

Your construction works excellently. 45x70 as beams are sufficient, screw them in with lättbetongskruv.

 

[FStrandberg]

Okay, thanks for the response. If I choose to use panels (simpler? and probably sufficient since the wall is now indoors), what type and how do I get it to blend in with the surrounding wall?

/Fredrik

 

[isolde]

On the outside of these, I attach double boards (plywood + gypsum?) that are not quite set flush with the surrounding wall but a few mm inwards so that joint compound can then fill out and make the construction blend with the surrounding wall.

You need to use fiberglass netting; otherwise, cracks will appear, and the window niche will be "visible." I would probably use a heavier net like 145 g/m2. The alternative to go with regular fiberglass strips, but double layers, is not viable because you can't get strips at least 20 cm wide.

 

[FStrandberg]

Thanks for the tip! Do the mesh/strips need to be at least 20 cm wide then? 10 cm on each side of the seam.

 

[isolde]

It's a bit of a rough estimate, but 10 cm net on each side of the seam is not an exaggeration. The easiest way is to get fiberglass netting for thin plaster, for example from STO. It is 1.1 m wide. http://www.sto.se/42127_SE-Katalog-Produkt.htm?prodId=PRODSE_0181