All standard shipping containers come with a circa 1-inch thick marine treated plywood floor
Underneath this there is a waterproof coating, often a bitumen based coating and some very heavy duty cross-members, which take the cargo weight whilst the container is being lifted.
This covers all standard types of shipping containers including side opening containers, open tops, and flat racks as well as all of our storage containers
Modern refrigerated shipping containers typically come with a jet-washable raised aluminium t-bar floor
DNV (offshore oil and gas industry spec) containers will typically come with a metal plate floor as standard.