Urgent Screed Question

[VDubDan]

Hey guys - got some screed coming tomorrow, but now I've finished up the insulation and revealed the existing floor I'm a bit lower than I anticipated. To get to same floor height is just under 100mm. I knew it would be high, but thought more like 85mm

Concrete company reckon their screed will be okay, but I just wondered if I'd be alright putting some 25mm PIR on top of the existing insulation (120mm PIR).

Another alternative would be to come low and top it up with a liquid screed/self levelling compound after I guess.

Or am I over thinking as usual and should I just crack on? Concrete company said just to keep a light mist of water on top and doors and windows closed

 

[23vc]

100mm screed can be fine if that’s the question? I’ve laid 100mm sand cement screed before.
Don’t go for having to top up 30mm of slc/sls, that’ll be really costly

+ yeah adding more insulation should also be fine but again at a cost

 

[VDubDan]

100mm screed can be fine if that’s the question? I’ve laid 100mm sand cement screed before.
Don’t go for having to top up 30mm of slc/sls, that’ll be really costly

+ yeah adding more insulation should also be fine but again at a cost

Over thinking as ever! 100mm screed it is