I'm Having a carpet fitted by carpetright (who curiously couldn't be beaten on price by all the local independants I tried).
Anyway, opted to sort out my own underlay, as I know they massively markup on those sort of things. I already have grippers and carpet bars fitted.
That said, there is a MASSIVE choice, and no obvious way of working out what's best for me. I certainly don't want to skimp. The carpet is for a livingroom hall, open stairs and upstairs landing. 55sq/M worth.
Now it seems PU Foam is what everyone fits these days (rather than the rubber waffle stuff I have down currently) I was leaning towards one called 12mm Dreamwalk, it's got good thermal properties and good sound deadening properties (both the best ratings I have seen), however a couple of problems.... a) it's an "own brand", by a company called Wilsons carpets. and b), it's been mentioned that 12mm may be too thick, and the carpet will bow over the grippers, and also not stay too well because the carpet is higher than the gripper.
I have been also looking at Cloud 9 Contract (in 8mm) and Super Contract (in 10mm). Both have lesser thermal and sound ratings, and are a bit more, but from a known name...
Really confused, and would appreciate some advise from someone in the know.
Cheers.