I have some water-damaged 1" vertical end-grain balsa core in my
fiberglass deck. What is the best replacement material available?
Criteria for "best" are 1) suitability for blue water cruising
sailboat, and 2) thermal insulation factor. Cost of material, while
important, is probably not a factor, after all the labor of removing
all deck fittings, opening up the deck sandwich, routing out the wet
balsa, and then re-glassing. Thanks, Steve L.