Gap filling pre tiling

5 Mar 2008
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United Kingdom
I am about to tile the bathroom floor which is concrete. I have ripped up old pipes leaving a gap of about 100mm wide by 50mm deep, and about 1500mm long in the floor. What can you recommend to fill this with that will dry very quick so I can tile over.

On top of the concrete I will be fixing insulation boards, fixed with flexible adhesive, then on top of this will be electric underfloor heating, then flexible adhesive, then tiles.

Sorry if this is in the wrong section but your help would be gratefully received.
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