Regarding opening the chain locker door to get air circulation, we had built a mahogany louvered cover which we use when not making passage. The appearance is Amel-like and it's easy to put the solid cover back in place when needed.
(Louver notwithstanding, the floors still rotted out, but I am just about done with the replacements.)
Cheers, Craig SN68
, wrote :
This is not an unusual issue with older SMs. In Martinique Amel has a person who specializes in the repair. He cuts out the old floor and drops in a new perfectly fitting new one. It is a quick and (I am told) not expensive procedure. For those whose floors are still good, opening the front water tight compartment door whenever the boat is left for some time, will delay or prevent the issue. I also spray the wood floor with an anti-mold solution every year or so and the floors are solid after 19 years.
S/Y Ladybug, SM 216 now in Port du Marin, Martinique