Nick Atty wrote:

I did wonder - as you are
doing - that if my carpet never got soggy, mouldy or smelly, there
really is a need for it.


Your carpet is highly permeable, and allows any trapped moisture to
escape. Laminate is almost completely impermeable. Water will be trapped
under it, and absorbed by the bottom surface. This will cause swelling
and distortion. How much will depend on how good your DPM is under your
concrete.


--
Grunff