A note in a previous post gave me pause and I thought I'd solicit some advice. We've designed and am building a 20' day sailer (no cabin - large cockput and small storage area under the deck fwd of the mast . It's designed to be self draining (i.e. cockpit floor is above the waterline and drains out holes in the transom). This means that there is around 5 inches of bilge below the cockpit floor that will be more or less sealed. There is a crummy picture of it at: http://media18.hypernet.com/mywb/scr...ail&boatid=538
The previous post mentioned that this single most important point in preventing rot was ventilation. However, with a self bailing floor, if I ventilate the bilge area I'll be inviting water into an area where is has little or no chance of escaping. I was hoping to fill the bilge area with that expanding foam stuff and then seal the whole thing up. Now I'm wondering if that's a dumb idea. Any opinions?