Re: New Carpet
Tash, I agree it will/can rot, eventually. However, I have seen MANY decks last 20+ years with treated posts into the ground, which is often wet. Rot IS an organism, btw, according to what I've read on this issue.
Miy PT ply (dried it out for months, btw) is covered with a layer of glass and several of resin to seal it from the elements as best I could without going overboard. I did screw in the seats, etc. so i know it's not totally sealed...that's why I used PT wood!
Good marine carpets are designed to dry out. Under seats and the like require ventalation, of course - or don't carpet in those areas. My boat originally had carpet everywhere; in the battery compartment, under all seats, up the sides of the bow 9under bow seats), and in the ski locker. My ski locker was soooo happy when I pulled that nasty wet rug out of it! No, I did not put the new one in those areas, just open, visible and walk-on areas.
I know it's a compromise, but not as big to me as losing the look and comfort of the carpet.