Sub-floors must be inspected and tested to make sure that they are within acceptable
tolerance parameters before starting the installation of any flooring type. Both
the flatness and levels of the sub-floor must be within tolerance. The floor installation
team must also ensure that the environment in which the floor is to be installed
is within tolerance. Incorrect relative humidity percentages and room temperatures
will adversely affect an installation. If the wood floor is being installed above
an under floor heating system, the heating system must be correctly cycled prior
to installation taking place; this process alone can take up to two weeks. The following
information contains industry standard tolerances for the preparation of sub-floors
that are to be covered with wood flooring.
CEMENT SCREED
Screed must be level to within a maximum tolerance of 3mm per 2 linear metres
in all directions. loor.
JOISTS
Joists must be a maximum of 400mm centers and level to within a maximum
tolerance of 3mm per 2 linear meters in all directions.
FLOORBOARDS
Existing floorboards above joists must be level to within a maximum tolerance of
3mm per 2 linear meters in all directions. Any damaged or rotten boards must be
replaced.
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