Laminate Over Wood - Vapour Barrier?

[RealPolitik]

About to lay a laminate floor on a combination of floorboards and chipboard over joists in a ground-floor room.

There has been some previous damp (rainwater entry, now remedied) which rotted the ends of two joists but otherwise it's nice and dry.

Do I need a mositure/vapour barrier? I'll be using fairly thick fibreboard underlay.

 

[bookahandyman]

if youve fixed the water ingress then no but have you fixed the rotten joists, cos once your floor is down your stuffed to get under and fix them without hassle.

 

[WoodYouLike]

Type of underfloor is type of underlayment

 

[RealPolitik]

Thanks.

Rotten joist ends have been replaced - no vapour barrier it is then.