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5.
Laying on an existing floor
If the laying surface is an existing floor (wood, marble, stone,
ceramics, terracotta and such like) which is to remain, apart from
specifically checking the strength of the old floor and its perfect
adherence to the substrate, the surface must also be correctly
prepared. This preparation consists of totally eliminating any grease
(waxes, polishing products, etc.) and any varnish, by rubbing down or
scratching, in order to make the laying surface suitable for best
grip of the adhesive. With an old, solid wooden floor with main
laying pattern in one direction, the new floor should be laid at
right angles to the underlying floor.
6. Laying surface of panels consisting of woody materials
The laying surface may be fabricated with panels consisting of woody
materials, preferably water-repellent, that are suitably compact to
withstand the traction of the parquet and to allow adequate
anchorage. The panel thickness should be at least 18 mm for
8÷14 mm thick floors and at least 25 mm for 22 mm thick
floors. The panels may be simply laid on top of a vapour barrier that
has been laid on a load-bearing surface, which should be thermally
insulated if necessary. The panels may also be nailed onto a wooden
supporting structure, the size and load-bearing capacity of which has
been suitably checked. Also the panels should be laid leaving a gap
of at least 5 mm from the outer walls, while expansion joints should
be provided in all large rooms, dividing the floor into fields with
maximum dimensions of 4x4 metres up to 6x6 metres.
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