laminate flooring underlay/insulation

[johnhenstock83]

good morning,

 

our extension is more or less ready, the skimming is drying nicely. I suspect we'll be able to start decorating (painting, flooring, second fix etc.) this weekend. I found 12mm thick laminate for a good price, we're probably going with that. I wanted to ask if people have some advice around underlay/insulation.

 

about two thirds of the extension is new, hence 150mm celotex on a suspended floor, 80mm screed. the old bit is solid floor, directly on the ground, no insulation.

 

I thought about laying aluminium foil all over the place, tape it with alu tape, foam underlay on top and then the laminate. is it worth spending a bit more or is it overkill?

 

thanks