Here's what I did on my last boat, and will probably do on my V22:
- Get a piece of peg board (that cheap stuff that people use in their shops to hang tools.
- Cut it to the size/shape of your ceiling. You can do this in sections.
- Peg board is not much better than cardboard with water resistance, but you can use this to your advantage. Use a thin epoxy mixture (used to seal wood), and coat the whole thing. Remember, anything not soaked into the material is dead weight. Make sure you wet out everything, focusing on the back and the holes. I tested this on a 1' x 1' square which I left to soak in my bathtub for a week - no seepage.
- Now, apply your headliner material of choice to this using a liquid adhesive. Make sure to keep the area around the holes clear of adhesive. The advantage of this approach is that:
- You don't have to glue the material directly to your boat
- You don't get sagging
- The holes in the pegboard allow for some breathing
- Now, affix 1/2" wood slats to the ceiling around the edge of where your headliner will go. I just used a liquid adhesive. These slats only need to be wide enough to take a screw. If you have a good arc in your ceiling, you may want to apply some slats near the center line. You don't want a continuous unbroken perimeter - just enough to hold your headliner in place. This allows the headliner to breath from both sides.
- Run your wiring
- If you want, you can tape a couple of satchels of mothball fragments to the back of the headliner to (supposedly) combat mildew.
- Now, just screw the prepared headliner to the slats (drilling pilot holes of course. Be careful to limit the depth of your pilot holes so you don't drill through your deck. Same with the screw length.
The great thing about this approach is it takes about 5 minutes with a screwdriver to completely remove or reinstall the headliner. This makes rewiring and other maintenance a snap. It also completely covers the ends of through-hull bolts, without blocking easy access to them or preventing them from draining (should they leak).
Of course, you can install it in panels of whatever size/shape makes sense to you. I've thought of running teak "beams" across the ceiling spaced every 2 feet, and placing panels between the beams. This would make easily-managed panels and look great.
Also, if you don't sail your boat during the winter, it takes about 5 minutes to remove the headliner and you can store it with your cushions.
However, if your were concerned about berber carpet being too heavy, this may not be for you.