Which repair compound for fixing damaged wall of concrete hollow blocks?

[Funkis1955]

What should be used for filler/repair compound to fix damage around the basement window before plastering?

The plan is to build a mold around the window to ensure the repair is straight and neat.

It is a basement wall made of concrete blocks that will then be plastered, so I want a material that the plaster adheres well to.

 

[Claes Sörmland]

Some regular plaster mortar C seems like a reasonable solution. Where you need to build thicker layers, you can apply masonry mortar B in stages.

 

[Motherfucker]

What should be used for the mortar/repair compound to fix damage around the basement window before plastering?

The idea is to build a form around the window to ensure that the repair is straight and nice.

It is a basement wall made of concrete blocks that will later be plastered, so I want a material that the plaster adheres well to.

If you want to do it in one application, Finja's "laga vägg" is a good product that can be applied up to 100mm in one layer.
If you use plaster mortar B or C, you need to build up about 10mm at a time and let it dry before the next layer.

https://www.finja.se/storage/ma/106...F936CF9746BDA9407EC5F/Laga Vägg_162_PB_sv.pdf

 

[Bart]

Cement mortar A. Good for most things.
https://www.combimix.com/se/produkter/betong/standardbetong/cementbruk-a