laminate floor, which underlay

[cascas]

Hi,

I am about to lay a laminate floor in a lounge/hall area. Probably use Floors2Go megaloc (classen) flooring.

Previously I have just used the underlay that was supplied with the flooring (i.e thin 1-2 mm white foam from B&Q, or silverbacked 2-3mm from Floor2Go). This time, I am buying the underlay separably from the floor as it can be purchased cheaper on-line (for a higher spec).

Fitting is on a concrete floor, and I have a choice between Silver Laminate Underlay (3mm, 0.5 tog, 19db sound reduction, built in DPM), or Sonic Gold (5mm, 0.9tog, 23db sound reduction, build in DPM), both from Tradepriced.

Is it better to use a thicker underlay, in the event of any floor imperfections, or can being too thick be a disadvantage?

 

[DAZB]

'can being too thick be a disadvantage' ?
well it hasn't done Paris Hilton any harm.
anyway as your options only have a difference of 2mm then you wouldn't really notice any issues with the thickness but the thermal performance would probably warrant the extra cash so i'd go eith the thicker stuff.