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Ah see now, I had thought of that Damp proof material = 1mm Insulation on a test has compressed to about 4.5 - 5mm i still think it needs to be about 3 mm thick, Was aware of the gap calculation just wasn't sure if it was advisable to use ply as a subfloor, On another note is...

Can you explain a bit more please?

Hi I have read the stickies but to no avail, I have about a 10mm heght difference between my lounge/dining room and kitchen, I have laid a screed which has settled at about 2-2.5mm I also have some compacted wood insulation and damp proof to lay which will add about another 7 to start but...