Levelling concrete to match floorboard level

[Pewit]

I plan to fit laminate flooring in my hallway.

Due to woodworm and poor condition, I have renewed the floorboards with new timber prior to laying a 6mm ply subfloor.

However, part of the hallway was tiled on a concrete base (approx 2.5m x 1m). The tiles have been removed, leaving a mostly even surface, and I now need to raise the concrete base to the same level as the new floorboards (approx 15mm).

I have tried using self-levelling concrete to match the new level - but I have had problems since the new concrete managed to find gaps between the floorboards and the old concrete surface and poured beneath the floorboards! (I have now removed the self-levelling concrete)

I have looked at two possible solutions, which would you recommend?

1. Use self levelling concrete but this time seal all gaps between the old concrete and the new floorboards (with what sealant?).

2. Buy 15mm plywood (or two thicknesses to make up 15mm) and cut to fit the concrete area. Filling any gaps beneath with cement to provide level support for the new surface.

Paul

 

[chappers]

I would do the latter stick it down with gripfil and a few screws for extra security.

 

[vivaro]

Definately build up with plywood, for several reasons. It will be easy and cleaner, and much warmer on bare feet in the winter time!