irecently have had a new kitchen fitted. the worksurfaces are corian mounted on mdf. We have put some of the same surfaces outside (under a canopy). To be fair to the installer they did say it would warp. But i requested them to mount it on marine ply. i even offered to buy the marine ply and free issue it to them.
they assured me they had mounted it on marine ply. it has been installed about 2 months and it is now beginning to warp. should marine ply warp in wet damp conditions? i was under the impression it could be submersed in water
Unless the ply was allowed to dry and then sealed on all sides I think you have to expect some distortion. Marine ply would not distort as much as wbp bonded ply and you have to be careful which one is used.
Lots of stuff on the market these days being sold as "marine ply" which would not withstand immersion. The proper stuff is very expensive. If you go to a yard and buy "marine ply" in all good faith (as your installer or even you may have done) it may well be of a lower spec than you thought you were getting but he still used "marine ply" per your request.
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