Excellent thanks you I will build a base with 4x2 and 18mm wbp ply. Do I need to seal the ply before I put a weak mix of sand and cement on to bed down onto?
When it comes to leveling then yes you can use packers, I usually use hardboard cut to the same width and length as the wood, just don't leave any gaps where the top could flex. Remember, level as close as possible towards the waste, an odd mill out isn't then end of the world.
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