Teak ply for interior work - marine grade ?


There is some interior joinery in our future as we turn Senta II into our world cruiser. Some of that work will be plywood rather that solid teak, for obvious reasons. When I built a small speedboat as a kid I built it out of marine grade plywood, but that was the actual hull, not interior joinery (and teak plywood cost less than the same volume of gold !)

My question is if we need to shell out for marine grade teak plywood for the interior joinery or if that is unnecessary since it is interior work and will not see anything close to submersion in water ?

A related question, for glue and screw, what glue to use for the joints that are not intended to be disassembled ?


Loren Beach

O34 - Portland, OR
Senior Moderator
Blogs Author
When I was a kid, there was a glue difference between "interior" and "exterior" ply. Marine grade referred to plywood with no (or maybe it was very small) voids allowed in the layers.
FWIW, I do remember that my dad had some "interior" plywood that came apart quickly when left outside in the rain.

It is my understanding that sometime in the intervening years all plywood started being laid up with waterproof glue, and that the "marine" grade does still exist to denote that it has little or no voids inside.

There are quite a few Grades of ply, to describe surfaces, also.


ps: who can ever forget: "C-C-plug-n-touch" !?
Last edited:

Lucky Dog

Member III
I would agree that the glue is the major difference and the voids is a rating system that I think is less than accurate. I made a desk once that was suppose to have no voids, and did, in a critical spot of course. ended up starting over.

As for the glue if it is not submerged in water you should be OK. I suspect you will seal with a polyurethane. We build small prams at school and use non marine grade, but coat with polyester resin.