Back when I was first thinking about insulation, I figured I’d get the best bang for the buck with spray foam (R7 per inch) on the hull and cabin top and 1-1/2″ thick Buffalo Batt polyester nonwoven fabric (R3) on the backside of each plywood panel that faces the hull. That combination should stop condensation dead and keep conditioned air in the living spaces, where it belongs. With the spray foam done, I decided to make the plywood stack smaller and install a panel.
The big wire loom on the right is the main feed shore power line that will go to the isolation transformer in the V-berth.
This stuff is a LOT nicer to work with than fiberglass. No itch, and since it’s a fabric it doesn’t lose fibers.
So, the lesson learned here (and in a lot of other instances) is that cutting the panel, slapping some primer on the back side and edges of the panel, and installing it (like Chris Craft did originally) would have taken maybe an hour. Doing it the way I did took a day, including an overnight curing process for the epoxy. Multiplying that out over the entire boat, I figure I’ll have a literal month of Sundays added to the time the project will take to complete with this approach. It better be worth it. In any case, this one panel install gave me some ideas for how to improve the process that I’ll try out on the next panel.
Oh, and if anybody’s interested, I’ve got a low-hour set of Cummins 6CTA exhaust risers that I just listed for sale.