Better grades also tend to be lightweight strong and virtually free of defects.
Marine grade lumber.
The cost of marine grade timbers compared to other types of materials can prove to be more economical with a properly engineered seawall or retaining wall lasting up to 25 years when adequately maintained.
That is it s not waterproof.
Marine deck boards feature a water repellent treatment for added protection in marine environments.
Hope this helps i work in lumber at our local store.
This also includes the treated material required to build docks and decks.
Formed from high quality 1 grade dense 2x6 southern yellow pine dense select structural or 1 prime marine deck is guaranteed to be both attractive and durable.
Pressure treated lumber has been synonymous with marine use for many years.
It is a good quality hardwood plywood made with waterproof glue but since it s not treated with chemicals it is not rot resistant.
The 3 4 inch marine grade is 7 ply we dont carry the 1 2 inch but i would think it would be 5 ply.
Marine timbers can also give your waterfront a more natural look.