Insulating an existing concrete floor.

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We have a sunroom which was built many years ago with a solid concrete floor and no insulation. We've always had carpet laid but as it needs renewing I was hoping that there is a product which could provide a cold barrier between the concrete and carpet underlay. I know it's a long shot but something just to slow the loose of heat would be great.
 
How much level difference can you put up with?
You would need to lay insulation under the carpet
This means that you could have a step up into the room and or a step down to the outside (which you likely have.
It could be a small step with minimal insulation or a bigger step with greater insulation

Efficient insulation can be thinner for a given value but it’s a balance
Look at kings pan type first
 
Concerned that the PU foam could be flattened easily, what about putting layer of 4mm or 6mm ply over the top and then insulating carpet underlay on top? Think this would be the only solution considering I don't have much height to play with to the adjoining floor levels.
 
I don't have hardly any on 2 of the 5 thresholds into the sunroom. The others would take at least the 4mm foam and a 6mm ply covering. This would still allow me to fit a quality 10mm insulating carpet underlay.

Perhaps I could make sloping thresholds between the two levels on the 2 tight entrances.
 

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