Marine Ply / Exterior Ply. What's the difference?

23 May 2006
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United Kingdom
I am building a raised plinth to sit a shower tray on. The instructions say to use Marine ply as the top board.

I can only find Exterior ply in places like B&Q. Is that the same?

Is 1/2" thick enough or should I go to 3/4"
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w.b.p. plywood is more than enough for a shower base. marine ply is expensive overkill.

use 18mm thick. (3/4")

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