Watching teak deck maintenance, repair and replacement is interesting.
The narrow teak planks are spaced with deliberate gaps. The gaps are filled with various materials, to prevent leaks. Oakum/pitch historically, with screws and bungs. Special caulk has been used. More recently, 9mm teak veneer, epoxy bonded, no screws nor bungs, with black epoxy filling the gaps. Steam bending.
- Brian