Remove old screws from aerated concrete wall?

[Tee-Time]

I have removed an old sink, but I'm having trouble removing the screws that remain in the lightweight concrete wall. It seems like the screws are connected; when I pull on one, the other moves. I'd prefer not to make an even larger hole to remove the screws, but what is the best way to proceed here?

 

[jonko]

Cut them and plaster over.

 

[Tee-Time]

Cut them and putty over.

Thanks for the tip! I've been considering cutting and puttying over, but since a new vanity is going up in about the same place, I thought it might cause problems if old screws are left where new ones need to go.

 

[A-Man_08]

What is on the other side of the wall?

 

[jonko]

Thanks for the tip! I've been considering cutting and filling over, but since a new vanity is going up in practically the same spot, I thought it might cause problems if there are old screws where new ones are going in.

If the new one is to be screwed in exactly the same spot, it's probably no fun, and you'll have to break it up a bit more...

 

[GoC]

Have you tried unscrewing the screws?
But a vanity unit isn't attached in the same place as old washbasin brackets.
Take pliers and twist the screws up and down, and they'll eventually break. Most likely nearest where they're fixed to the plate they're attached to.
Fill the hole with husfix or some fine concrete, smooth it out. Done

 

[Tee-Time]

What's on the other side of the wall?

On the other side of the wall is the staircase. I've been wondering if they've driven the screws in from that side but can't see any trace of it.

 

[HSP]

Guessing that it is a continuous threaded rod and plate on the other side that is then recessed and plastered over.... A good method for fastening heavier items in lightweight concrete...

 

[Tee-Time]

Have you tried unscrewing the screws?
But a vanity unit is probably not attached in the same place as old sink brackets.
Take pliers and bend the screws up and down, and they will eventually break off. Most likely closest to where they are attached to the plate.
Fill the hole with house filler or some fine concrete, and smooth it out. Done

I have tried unscrewing, pulling, and tugging, but they are solidly in place, so I suspect they are somehow connected inside the wall. But I guess I'll just have to break the screws and hope the next piece of furniture doesn't need to be attached in exactly the same spot.

 

[A-Man_08]

I have tried twisting, pulling, and wrenching but they're stuck firmly, so I suspect they might be connected in some way inside the wall. But I guess it will be necessary to break the screws and hope that the next piece of furniture doesn't need to be mounted in the exact same spot.

Measure where they are and make a small sketch so you know exactly when it's time to put something up.

 

[Tee-Time]

Measure where they are and make a small sketch so you know exactly when it's time to put something up.

Good idea!

 

[GoC]

I have tried to unscrew, pull and tear but they are stuck like a rock, therefore suspect that they are connected somehow inside the wall. But I guess it will be a matter of breaking the screws and hoping that the next piece of furniture doesn't need to be attached in the exact same spot.

The probability is extremely low
You can almost attach the new vanity wherever you want. Usually, there are a couple of screws at the top of the vanity, and then the sink sits on the piece of furniture itself.

 

[Tee-Time]

The probability is extremely low
You can almost attach the new cabinet wherever you want. There are usually a couple of screws on the upper part of the cabinet, then the sink rests on the piece of furniture itself.

Yes, you're right about that. I got stuck thinking that the new one would be installed in a similar way to the old, but that's probably not the case, no. Thank you!