I keep hearing that you should nail or glue solid wood floor solid wood flooring to the subfloor, but if so, then how can it expand and contract based upon temperature / moisure changes in the room?
Its a very slow movement which takes weeks to move. The glue and nail systems allow slow movement. The only time the wood moves at a high speed is when something big is wrong and the floor will fail what ever the method used.
9 times out of 10 suitable underlayment (3mm with or without DPM, or 5mm if extra leveling - sound-insulation is needed) and glueing all the T&G's completely.
Elastilon we rarely use. Although it is a good product, especially on 'tricky' floors, it is rather expensive.
The other times we glue the floor to concrete of chipboard (with underfloor heating) or glue and nail Design Parquet on plywood or mosaic Oak tiles (depends on tpye of underfloor: concrete is mosaic, other underfloors is ply etc)
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