Ground Floor Laminate question?

If it's bumpy laminate floor won't lie properly. You shouldn't need a DPM, but it there's any question of damp, put one in.

The thicker fibreboard underlay will easily allow for 1 -2 mm difference in level, Don't forget to lay the underlay diagonally and the laminate at 90 degrees to the floorboards.

Dave

Got a dog by any chance ? - the noise of them scuttling around can be quite bad, and they can have trouble getting up off the floor if they`re getting old and creaky :-}

We've got a hamster!

Thanks for the replies, I anticipated using the fibre underlay due to the slight differences in level, wasn't aware I should lay it at diagonally. Floorboards are on short span so laminate can go longways towards the window.

No signs of damp anywhere, so I'll not bother with the damp proof membrane.

All the professionals I know put down a damp proof membrane on every concrete floor. If the fitting instructions say use a damp proof membrane then use a damp proof membrane. If there are any future problems with warping or joints "tenting" you wont have a leg to stand on.

Only way to avoid a join in the underlay coinciding with a join in the laminate flooring.

Short span? Wot dat?

Agreed, but according to the OP its not a concrete floor - if I read things correctly?

Dave

Sorry, reverted to structural engineer mode. Short span is the "width" of the room, the usual span of the joists, consequently, long span is the "length" of the room. So I'm planning to lay the boards perpendicular to the joists.

And you're quite correct that it's not a concrete floor, 500mm gap under the joists to an earth solum.

Always use a DPM when laid on a concrete ground floor ... personally I use a

Rick