Some irregularity can be tolerated on the sub-floor when fitting any
wooden floor with any installation system.
However, the tolerance will likely be different depending on the installation system
used. The general rule would be a variation of ±3mm over a 2 metre length, but please
check the specific installation instructions for the method chosen. The best way
to test is to take a board and lay it on its edge so you can see any peaks or troughs.
If either happens to be outside of the parameters some sub-floor preparation will
need to be applied.
Remember that the finished flooring type can only be as good as the installation
allows. We would always recommend that, for any installation type, the sub-floor
preparation is vital and irregularities should always be corrected as opposed to
finding another way around the problem.
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