Have chiseled away an old drain. What do I fill the hole with?

[Björn_Nilsson]

Hello. I've dug out an old drain that needs to be removed. This leaves quite deep channels in the concrete slab. What type of mortar should I mix up and fill it with? I plan to level and lay tiles afterward.
Thanks in advance.

 

[huggan]

Finja 240 Leveling Fine Fast so you can float the next day.

 

[Björn_Nilsson]

Max 30 mm thickness is specified. My cavities are 150-200 mm deep... Is that really correct?

 

[Helioz]

Concrete if you have a concrete vibrator, otherwise Expanderbetong Grov.

 

[JOW]

Weber floor 318 is also an option.
Good if you skip "traditional" concrete if you need to apply a waterproofing layer quickly.

 

[huggan]

Max 30 mm thickness is specified. My cavities are 150-200 mm deep... Will it really be correct?

No, of course not. I don't know if Finja has any product that handles more than 100 mm that is self-drying. Except for EPS then.

 

[myrstack]

EPSCement until you have 3-5cm left, then a quick leveling compound like 460 Slipsats Snabb so you can tile after 2-3 days. Alternatively, of course, a pile of trench sand/gravel followed by a suitable fiber cloth or similar and again a leveling compound.