Do I need underlay over isorubber for laminate flooring?

[wolfman24]

I've bought a new build flat and i chose it without flooring. Over the concrete floor they have put an isorubber top which looks like the image in the link below:

http://www.soundservice.co.uk/isorubber_top.html

I'm wondering whether I need to put down some underlay before the laminate goes down.

Also, any suggestions on good underlay would be very helpful!

I will be using 12mm thick laminate from wickes (not sure what the AC rating is).

 

[crazydaze]

Definately use a seperate underlay, something like Duralay Duratex will give a nice firm finish and add to the sound and temperature insulation much better than the thin foam stuff. 4mm Fibreboard Laminate underlay would work well too.

 

[wolfman24]

Definately use a seperate underlay, something like Duralay Duratex will give a nice firm finish and add to the sound and temperature insulation much better than the thin foam stuff. 4mm Fibreboard Laminate underlay would work well too.

Thanks. If I use something like duralay over the isorubber is there a risk of bounce?

The developers told me that their own floor fitters lay the laminate directly on the isotubber.

 

[crazydaze]

Definately use a seperate underlay, something like Duralay Duratex will give a nice firm finish and add to the sound and temperature insulation much better than the thin foam stuff. 4mm Fibreboard Laminate underlay would work well too.

Thanks. If I use something like duralay over the isorubber is there a risk of bounce?

The developers told me that their own floor fitters lay the laminate directly on the isotubber.

I ant magineyou will have. Bounce issue, neither product is soft or deep. Builders installers do an awful lot of things 'differently' to the main stream fitting trade, usually to cut time and costs (but not to your advantage)

 

[wolfman24]

Definately use a seperate underlay, something like Duralay Duratex will give a nice firm finish and add to the sound and temperature insulation much better than the thin foam stuff. 4mm Fibreboard Laminate underlay would work well too.

Thanks. If I use something like duralay over the isorubber is there a risk of bounce?

The developers told me that their own floor fitters lay the laminate directly on the isotubber.

I ant magineyou will have. Bounce issue, neither product is soft or deep. Builders installers do an awful lot of things 'differently' to the main stream fitting trade, usually to cut time and costs (but not to your advantage)

I've noticed that duralay duratex doesnt have a dpm. Is this something i need?
The underlay will go between the isorubber (glued on the floor) and the laminate.

If i use an underlay which has a dpm (like selitac from B&Q) could this cause issues with moisture if it sits between the isorubber and the laminate?

 

[crazydaze]

On to concrete Floor TimbermateXL, on Wood floors the sister product Duratex.

 

[wolfman24]

The thing is there is already an isorubber underlay stuck to the floor.

Can I use duratex between the rubber underlay and the laminate?

Or will this cause the boards to move?