Apr 26, 2011 7:13 am
I'm looking for some advice on how I would properly prepare an existing 4" concrete slab (8mx2.8m) which I require to be "topped" to achieve a level surface ( the slab is presently sloping to one side for drainage for eventual tiling. The slab is in very good condition & I have already gone over it with a small concrete grinder to clean it up. The topping depth will vary from virtually nothing on the high side to to 50mm on the low side. I'm intending to use a concrete bonding agent as a primer on the existing slab & then get in the readymix truck.
Do I need to do something more to achieve a proper bond?
Re: topping a concrete slab2
Apr 26, 2011 11:33 am
0-50mm can't be topped with concrete, You will need to use a levelling compound such as ardex.
Are you putting something over the slab?
Also quantity will only be approx. 0.6 cubic meter
Re: topping a concrete slab5
Apr 26, 2011 1:55 pm
Many thanks again.
Would you think the sand/cement mix would bind properly to existing slab if I used a bonding agent as primer & in the mix? Or do you think I should also prepare the slab in some other way.
Guess I'm being cautious but don't obviously want to finish the job & find out I have a substandard base that I've glued the tiles to.
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