Depth for screed

[chriselevate]

I've posted on the tiling section about putting more ply down in the hallway but a building inspector has said he'd rather the ply come out and be replaced with a screed. The problem is that I don't think there's enough depth to screed it is there?

The area is 3.5m x 2m and a depth of 30 - 35mm (photos attached).

Is there something that can be used instead of screed in order to level off this 30 - 35mm section of my hallway and get a DPC in?

Thanks

 

[foxhole]

The optimum thickness of a sand and cement bonded screed is 25–40mm, an unbonded screed should have a minimum thickness of 50mm, whilst a floating screed should have a thickness greater than 65mm for lightly loaded floors and 75mm for more heavily loaded floors.

 

[chriselevate]

Yeah I read that on google, thanks.

How about this...
https://www.sealantsandtoolsdirect....MI_JzmgcK12wIVD40bCh0oxAk_EAQYAiABEgIDwfD_BwE

Has anyone used it? My plan would be to put down a dpc membrane and then drop 30 - 35mm of this. It’ll take about 16 bags to do my 7m2.

What do you reckon?