thermal underlay for vinyl flooring (Lino) on concrete

gamston

hi folks, need to replace old "Lino" in kitchen & Utilitiy rooms the floor is concrete (need to level one of the floors with self leveller) in the past I have laid hardboard( to insulate) onto the concrete floor (glued the hardboard onto the concrete floor otherwise it lifts) 
what I wondering is there a real thermal foil to lay on top of the concrete floor to add insulation instead of hardboard 

FreeBear

I have concrete in my utility & half the kitchen. Used wood fibre boards in the kitchen and polystyrene foam in the utility area. But I used LVT click tiles in both areas rather than sheet lino. Insulation wise, I haven't noticed any difference in performance between the two types of underlay. The foam is quieter under foot...

There are multifoil insulation rolls intended for applications such as yours, but I am highly skeptical of some of the manufacturer's claims. As a vapour control membrane (DPC), they are good (but so is any other sheet plastic). The foil will reflect some heat back up through the floor, but won't do much as an insulator.

gamston

got a few boxes of wood fibre boards as that was my plan earlier this year, 
did you glue down the fibre boards ? 
I did think about click LVT click tiles but felt with a sheet of vynil (Lino) there is no-where for spillages to go

FreeBear

I laid the wood fibre boards on top of a sheet of plastic (DPM grade) and then the tiles on top. Both layers are fully floating to allow for thermal movement. Spills are not a problem as long as they are mopped up reasonably quickly. The design of the click joints limits any liquids seeping through. The down side is tiles are quite a bit more expensive than lino off a roll, but much easier to lay as you don't have to worry about glue & stuff.