Another laminate query

[Neil]

I've just bought all the kit to laminate our lounge/sitting room. I took a plan of the room in to the shop and the fella calculated everything that was needed.

However, while he worked out how much underlay & beading was required, he hasn't mentioned/supplied any membrane.

If the laminate is being laid onto floorboards, is the membrane really necessary? The boards are suitable for utility rooms & bathrooms so I'm presuming they have a high degree of water resistance anyway.

TIA

[The3rd Earl Of Derby]

Erm! did you get the underlay?

[Neil]

Yeah, got the 7mm 'Luxury Leveler Wood and Laminate Floor Underlay & Insulation' boards.

[The Medway Handyman]

Assuming the floorboards aren't damp :-) membrane is only necessary on a concrete floor IMO.