I'm about to lay a lamintae floor in a long room - almost 8m by 3m.
The room was created by adding a partial house extension about 6 years ago and has a floating chipboard floor. The floor is sound in that there are no 'steps' between the boards and therefore appears flat. However, close inspection reveals a 'crest' hlafway down the room. One half of the room appears to be slightly higher than the other. The chipborad the falls away before leveling towarsds the other end. In short it appears that the orignal room is slightly lower than the extension part. I would guess the difference in height between the two rooms is about 15 - 20 mm, the transition taking place over 2 to 3 metres in distance.
This appears to be beyond the recomended tolerance of what is considered a 'flat' floor.
Question is what do I do about it?
What appeared tobe a relatively simple job of laying the laminate is now looking not quite so simple. I have perchased some accoustic deadening underlay from Quickstep (2 mm thick). Would the 7mm fibre board underlay compensate better?
If I go ahead and lay on this floor what sort of problems will it create? My main worry is if the gaps between the laminate 'open' as a result of the uneven floor and then then laminate begins the chip away at the edge.
Is there is straight forward way of leveling the floor without ripping the whole thing up and starting again. To my knowledge the chipborad is laid straightonto polystyrene insulating blocks about 2 inches think which in turn lay on the a comcrete floor.
Any thought/suggestions would be most helpful. Thanks
Geoff