Underlay for wooden floor

[jedimistress]

I have some 2mm combilay and am wondering if I could use this underlay followed by the solid 6mm fibreboard underlay on top of that.

I want my floor to last as long as possible and I want extra insulation as it is concrete beneath. I read that fibreboard provides thermal insulation. I have not read that Combilay offers this though. I have also read fibreboard adds longer life to the flooring but unsure what to believe.

My concrete floor is level so I do not necesarily have to have the floorboards so am wondering what benefits they may bring. Longetivity to floor / thermal insulation? And can I lay them on top of the Combilay and have 2 underlays?

Thanks in advance.

[PAUL55]

If you want to do that, then its better to fit the solid underlay down first and then the foam underlay directly under the flooring. The reason for this is because the idea of the foam underlay is not mainly for insulation, but also to cusheon the boards from slapping against the existing floor especially on an uneven surface. hope that makes sense.

[WoodYouLike]

When installing on concrete you always place the Combi-underlayment first, that's to prevent any moist from the concrete going up.

If your floor is level, adding the 6mm foamboards could make the floor bouncy.