18mm T&G moisture resistant chipboard a terrible idea for a bathroom floor if 6m ply and vinyl going on top? I would use 18mm T&G ply but it doesn't actually seem that widely available.
P5 chipboard? Should be fine - it’s what it’s for. Seal the ply as well and you’ve got three water-resistant layers there.
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18mm T&G moisture resistant chipboard a terrible idea for a bathroom floor if 6m ply and vinyl going on top? I would use 18mm T&G ply but it doesn't actually seem that widely available.