18mm

The ply substrate is for a click vinyl surface. the cls frame will be sat on rubber pads or low level decking pedestals on rubber pads (on a membrane) I was thinking of using a stud type support framework so that ply edges have landings along their full length? So does the usual 400mm joist...

1st floor galley kitchen job (3m x 2m): I want to put click vinyl down but don't want the click to raise the finished floor level so I figure on replacing the 18mm chipboard sub with 12mm ply? Any thoughts? Do I need additional floor support perp to joists? At what ctrs? What size additional...