removing stones from pebbledash

[colw1]

hi I am having extension built at the moment but the problem I have is the old external walls are now the internal walls . The walls are constructed in lightweight blocks and I find when I try to remove the pebbledash it pulls big lumps out of the block and as these are on 4 inch I am concerned so I would like to know if there is something on the market that can be used to remove the stones if so any links would be helpful
thanks col

 

[Micilin]

hi I am having extension built at the moment but the problem I have is the old external walls are now the internal walls . The walls are constructed in lightweight blocks and I find when I try to remove the pebbledash it pulls big lumps out of the block and as these are on 4 inch I am concerned so I would like to know if there is something on the market that can be used to remove the stones if so any links would be helpful
thanks col

You might be as well to render over it, you won't damage any walls that way, and you can seal up the wall with a waterproof render additive - then skim on that. As long as the pebbles won't brush off, you will have a good key.


You could also dot and dab it , but I'd prefer the render.

If you hack off you will still finish the wall some way - why not eliminate all the work, mess and damage and just go over the dashing?

 

[roughcaster]

I agree with Micilin and would go for cement render and skim. Leave the old 'dash on, and work with it. It wouldn't take much to do irrepairable damage to your lightweight blockwork by trying to remove the old pebbledash. Not only are you pulling out chunks from the blocks, but you will also cause damage by cracking and shattering them as you try to remove the old coating.As long as it's sound, it's as good a key as you will get for rendering/skim finish

Roughcaster.