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1.
The consistency of the substrate
The substrate, whether traditional, in anhydrite or with fast-drying
hydraulic binders and in any case having a uniform thickness of at
least 4 cm, must be suitably compact to withstand the traction of the
parquet and to allow adequate anchorage. There must be no cracking in
process. The class of resistance should be at least 200¸250 kg/cm2:
at first inspection the substrate should not show marks when hit with
a 750 g hammer.
A good traditional substrate may be made using 350 kg of 325 Portland
cement for every cubic metre of aggregates (consisting of gravel with
a grading of 0-0,8 cm), taking particular care that the water/cement
ratio at the moment of laying is the lowest possible (W/C < 0,5). It
is a good rule to have reinforcement, consisting of electrowelded
steel bars with a diameter of 3 mm arranged in a square grid of 5 cm,
embedded in the casting. If the substrate has low strength and
cohesion, the possibility of strengthening it must be assessed;
special products may be used for this purpose, carefully following
the instructions for use.
2. Underfloor panel heating
or cooling systems
There are no particular indications against laying parquet on
substrates in which radiant elements are inserted for heating or
cooling the floor. The pipes must be fixed permanently in position
so that the minimum thickness of the concrete covering the same is
at least 3 cm, thereby allowing an even and not concentrated
spreading of the heat. Local hygrothermal conditions should present
certain characteristics in relation to the wood (temperature
15÷25 °C - relative humidity of the air 45÷60 %).
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