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Fitting new engineered floor on uneven floor
I would like to fit new flooring in the double reception room of my Victorian house. The current floor (original pine floorboards) is fairly uneven. There is a general slope of 50mm between one side of the room and the other and in both rooms some joists have settled more than others. The existing, mainly original skirting boards are difficult to remove without seriously damaging the plaster of the walls.
One flooring company suggested that they could pad out the room with chipboard and then fix engineered floor above, but I am worried that this will not create a good sub-floor.
I am thinking of taking up the floorboards, doubling up the joists to make level, possibly fitting insulation between the joists and then fit engineered flooring onto the new joists.
I am looking for suggestions to achieve a good and level end result and a floor that gives a good feeling to walk upon.
Engineered flooring is NOT to be used as structural flooring (such as T&G Chipboard flooring) regardless of joist centres or doubling, floors need to expand and contract (thats why a chipboard floor must have a 10mm perimeter gap all round) engineered flooring is a 'floating floor' and purely cosmetic, it 'floats' over the substrate floor and is not susceptible to expansion and contraction, you must use structural chipboard flooring, however, contrary to what you may think the T&G chipboard can be laid tongue to groove as long as all the tongues are glued with PVA, fixed with either ring shank nails (perfect) or good quality screws every 300mm C's, the chipboard does not need to be just onto joists, it can span over joists as long as its glued
Answered 11th Jul 2012