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Concrete a wall

Postby graham_woodwarduk » Thu May 17, 2012 10:10 am


I recently had a new damp proof applied to an internal wall and in order to have the damp proof done I had to remove the old plaster/concrete down to the brick work.

I plan to re-concrete this at the weekend and was hoping for some useful tips.

What kind of mix ratio should I use?
The engineer who done the damp proofing suggested using a 4:1 mix with a water proofer as well?
How do I stop cracks appearing?
Do I need to do anything to the exposed brick work prior to adding the concrete? (e.g. wet the walls?)

Thanks for any tips,
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Simply Build It

Postby Super chip » Fri Jun 08, 2012 9:19 pm

Pva the area first and then "dub out" the wall (fill any deep voids e.g mortar joins, broken bricks). Allow to dry and then do a full coat of render adding the waterproofer. All this should be done with the reccommended 4-1 mix, once semi dry key the surface. Then add a top coat of render once dry, but make this coat a 5-1 mix to avoid cracking.
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