The main issue with using a non marine plywood is the eternal problem of time.
Boats cabinets laminated playwood.
When a laminate sheet is glued to its surface it becomes a laminated plywood the laminate sheet serves both decorative and protective functions for the plywood.
If the plywood is required structurally then this becomes a messy problem indeed.
At fisheries supply we carry a variety of marine construction boards from trusted brands like coosa composites king starboard taco and more so shop now for all your boat.
Marine plywood construction boards if you ve got a big repair job that needs marine plywood teak lumber or fiberglass boards you ve come to the right place.
Given sufficient time and use it may be that the protective fibreglass layer becomes damaged allowing water to permeate the surface and begin to rot the underlying plywood.
Mdf is the way to go.
Plywood is used for a plethora of interior exterior and structural applications.
Tricel honeycomb panels are as strong as plywood for bulk heads cabinetry and furniture.
I would state in your contract that you can not warranty any laminate over a plywood substrate.
If it calls for it in the plans ask the builder to call the architect or customer to see about changing it to mdf.
It is the water resistance of the type of glue used to laminate the piles which determines the grade of the ply as well as wood of the veneers.
Plywood is normally sold in rectangular sheets of 4ft by 8ft 1220mm x 2440mm.