Cause: Experience shows that fractured joints are always in direct connection to side-bonding. In turn this also depends on indoor climate, wood moisture, type of wood, adhesive, state of the base and the lacquer system.
Solution: Ensure steady indoor climate (55-65% relative humidity). Wood moisture of the parquet should be 8-12%. Use special parquet primer to prevent block and side-bonding.
Correction: Sand complete fl oor down to raw wood, as far as possible; check substructure and bonding; refi ll joints and reseal using suitable primer.