MARINE VS REGULAR PLYWOOD
Not all structural plywood is labelled as marine due to the strict criteria it must fulfil.
Voids cannot be present in the inner veneer layers due to their delaminating effect. The risk of it occurring rises when there is a build-up of moisture. Manufacturing must also use waterproof glue.
Finally, marine plywood requires a higher grade face veneer than what is on exterior grade plywood.
