I would recommend a barrier of 1000 gauge polythene, you could use 500 gauge but it's very easy to damage such a thin membrane. Overlap all joints by 100- 150mm and seal the joints by tape. Use a duct tape for a top quality job- you can get a generic duct tape that's fairly cheap. Don't know about reducers though.
I'm guessing your chippy will use a minimum of 8-10 fixings per ply/ osb sheet. I suppose you could try and "seal" the head of each fixing with a patch of duct tape? Before the job starts ask your chippy what his proposal is and post it here for disection! It's a tricky problem and I'm not sure there is a guranteed way to achieve a vapour tight barrier in this instance
I need a reducer to go from tiles (about 8mm) to the solid floors (OSB 18mm + boards 18mm). That's a difference of 28mm. I've only seen reducers up to 15mm difference. Are reducers available for a difference of 28mm?
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