How to install a railing on this wall?

[mexitegel]

In blåbetong you can use a plastic cup but even better is gummiexbander

What would life be without autocorrect?

 

[snowjim]

In the blue concrete, you can use a plastic cup, but even better is a rubber expander. In the masonite, Wurth has a good fastener for M10 if there's loose insulation behind. I can't remember the name right now, I'll check on Monday.

Now, I'm no expert but I'm pretty sure it's regular hollow concrete, like this:



It might also be blue concrete, but it definitely shouldn’t be in this house.

Please check what you use to fasten into masonite. In this house, they actually didn't even use insulation, just studs.

 

[Trollskidan]

https://www.wurth.se/produkter/infa...gar-till-halrum/skivankare/vikankare-w-kd-tb/

 

[Slarvpellen]

Drill holes where the railing is to be attached, if there is a gap between the board and the old wall, fill it with foam sealant (carefully, not too much!). If it fills out sufficiently, the board will become completely rigid there, and you can screw the railing without the board bending. Unless you screw with enormous torque, of course.