When you say "floor", do you actually mean "sole".
The floor inside the cabin of a sailboat is usually called the sole.
The floors are frame cross members beneath the sole.
Is the plywood a structural component of the hull?
More information would be needed to offer useful information.
The main difference between plywood and solid wood is that solid wood
may warp if it gets wet on one side and not the other.
I would guess that this is a plywood skin placed over a fiberglass
sole in a fiberglass boat. I have replaced this material with
strips of wood screwed to cleats running crosswise. I made the whole
thing removable to enable cleaning beneath. I used black locust(not
generally commercially available but works great)
You could use honduran mahogany if you can find any or douglas fir if
that is all you can get. Spruce and cedar may be too soft. Teak may be
too expensive.
I've also used industrial agricultural flooring material designed to
go under dairy cattle to keep thier feet dry. Also used in commercial
kitchens. This is seriously ugly though.
I would not use the popular composite type floor (pergo is one brand),
I don't think it is waterproof enough.


Dave Mac wrote:
Hi I am in the process of replacing the teak ply in my sailboat
interior and was wondering if anyone has used any other type of floor
such as engineered or solid wood? What would the downside be to using
this type of material.

Thanks Dave