I am looking to put engineered wood onto exiting floor (ply) and was advised that if is thicker than 18mm that insulation is not required is this correct?
Depends on how you plan to install your new floor.
If nailed directly onto the ply - no underlayment needed
If fully bonded with flexible adhesive - no underlayment needed
If installed floating over it: use an underlayment that does NOT contain a DPM
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