Apr 26, 2011 8:13 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 12:33 pm
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 2:55 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.
Sign in or Join to reply to this Topic
gillybeanIs concrete slab needed for future deckingIs concrete slab needed for future decking
How are you going to build the deck - with bearers and joists or joists layed on concrete slab? If bearers and joists then obviously no point extending slab. If on slab…