|
|
|
|
|
|
2.
Determine the degree of moisture of the floor rough using an
hygrometer
The moisture content of the floor rough must always be measured
immediately prior to laying, in all those points considered
significant. It should be noted that measurement of the moisture
content should also be repeated whenever any works of preparation
or reinforcement, cleaning operations with liquids, etc. have been
carried out. A cement substrate or one made with quick-drying
hydraulic binders, laid in normal environmental conditions, should
be considered suitable for laying the parquet when its moisture
content is below 2% in weight. A substrate made in anhydrite is
instead considered suitable when its moisture content does not
exceed 0,5% in weight. A specific instrument is necessary for
determining the degree of moisture: the hygrometer. An
"electrolytic" hygrometer should only be used to measure the
moisture content of the parquet, while the "carbide" hygrometer
is the only instrument capable of accurately measuring the degree
of residual moisture in the substrate. It should be noted that
with any 4 cm thick substrate and underlying waterproofing
membrane, the measurement should be made at a depth of about 3,5
cm. If there is no blanket insulation or if the laying surface is
an existing floor, precise measurement of the moisture level must
be made in depth to reveal the state of the underlying components.
So-called "surface waterproofers" or "chemical vapour barriers" may
be found on sale which the manufacturers suggest be used to
insulate the wood from the substrate, thereby allowing laying to
proceed even in the presence of slightly higher residual moisture
than normal. These products, also in relation to the surveys of use
and necessary guarantees, should only be used as a last resort,
scrupulously following the manufacturer’s instructions. Lastly it
should also be checked that there are no structural or finishing
components (ceilings, walls, plasters, etc.) which may release
excessive moisture into the air or directly to the floor, whether
already laid or not.
Back to -
Technical info's index <<
|
|
|
|
