I am really grateful to everyone for your thoughtful input. On my BCC...admittedly a glass boat...we had the ventilation thing down pat and never had...
Wow, I didn't know anything about mineral wool. I see that Rockwool makes a bunch of marine-specific products (SeaRox), but I'm not likely to easily...
Yes, the off-gassing of toxins (including cyanide) when foam burns is a consideration. I'm pretty familiar with insulation principles and understand...