I am currently fitting out a Hartley 32 and opted to have teak decking in the cockpit area. I have to admit up front that I have a significant advantage as I own and operate a cabinetmaking and joinery business, and this sourcing, machining and working with such materials is our business.
Having said that, I love the look of the traditional laid deck, and was able to buy the decking already machined from an importer who was closing his business. The decking I bought is 9mm thick, and already has a rebate machined in it.
The process of laying such decking needs to be carefully approached, and I found Sika have a range of products designed specifically for this task, as well as good information for guidence.
We templated each of the areas to be decked, and laid the decks on a 9mm marine
ply board in the factory, and then bonded these to the cockpit floor and seats.
I have yet to finish the caulking, but the part completed so far looks good, and worth the effort.