Our cabin sole
underlay is also a 3/4" ply fastened to stringers. Don't know if you need access to anything below, but even w/the new cabin sole attached to them we made ours removable to still have access under them.
Also to create more integrity in the new cabin sole, all the boards were interlocked using tongue & grooves
. This ensured a tight fit and less mechanical fasteners were needed.
We looked at different techniques used for adding the stripes in the cabin sole. For us it was needed to extend the amount of teak we had to complete the job and wanted the finished product to not appear too dark. As discussed some of the other options are to do stripes with wood/epoxy laid into a routered channel or possibly paint
. How you choose to finish the new cabin sole may influence your direction for stripes.
If you do add a different wood for stripes, you'll want to pick something with good stability (less expansion/contraction w/heat and humidity) and other characteristics for marine use. We chose 1/4 sawn white oak due to its stability with that grain orientation, excellent rot
resistance and it is an indigenous species on the east coast
. Ash might be another good choice.
Not going into a lot of detail of a cabin sole finish as much is described here
, but we wanted something durable, easy to maintain and with a good non-slip finish. IMO, while varnish has a nice gloss appearance, it has no business on a cabin sole as it is very slippery when wet.
Lots of choices discussed here, but after it is done you'll appreciate the effort for the new cabin sole.