Once the foam insulation gets sprayed between the frames, it will be very difficult to securely attach mahogany plywood panels overhead. The panels over every door and cabinet would have to be free-floating below the insulation, which wouldn’t make for a very solid structure. Alternatively, I’d have to slice and scrape away the urethane foam, and that sounds tedious.
The mahogany plywood pieces I’m using are the scraps that were left over from the aft stateroom walls.
I’ve noticed that the luan tends to have a bit of spring in it. The transferred shape that I cut in the plywood is never a precise fit the first time around. It only takes a fraction of an inch here and there to make the fit too tight.
There’s a good fit all along the overhead plywood and frames, as well as along the edge where the overhead piece meets the walls and corners.
The pic above shows the stairs coming down from the helm station into the salon, behind which there is a large open area that permitted big things–like the fuel tank, the washer, dryer, and jet bath, to be moved into the aft stateroom. I removed the bulkhead there during the early demolition phase, since the plywood there was rotted out from the former teak decks. Since I no longer need that wide opening, it’s time to put the new bulkhead in.
Like all of the other aft stateroom walls, I had this panel finished with ICA basecoat clear before installation. We’ll top coat it when we do the entire interior.
The varnish protects the wood from the epoxy that’s used for the joint. Instead of staining the wood, any epoxy that squeezes out of the joint just wipes off with alcohol.
My ShopSmith bandsaw came in very handing making this piece for the ventilation opening. It’s a big chunk of mahogany, and none of my other saws could have made the cuts.
But before clamping the new mahogany in place, I coated the entire opening (chute? chase?) with epoxy until it wouldn’t take any more. Then I applied wood flour-thickened epoxy where there were sharp edges at the transitions from the mahogany toe rail to the aluminum deck, and then to the mahogany underneath. Once the whole opening was smooth with thickened epoxy, I coated it once more to give an even smooth finish. Any water that passes the ventilator scoops will encounter a plastic tube, with no exposed wood to rot out.
And with that, the aft stateroom is ready for spray foam insulation.