![]() My transom only had 1-inch thick wood core, embedded in heavy (1/2" thick) fiberglass construction and is now subject of an attempt to arrest rot that I discovered around the drain plug. Those timbers are the only primary structure, and do not extend beyond the bilge will/engine compartment on mine. The engine is mounted on heavy glass enclosed timbers and appear to be isolated from the referenced secondary form work. ![]() None of that work served as primary structure, although it did provide attachment points for finishes laid over it. If you pull the floor panel over the fuel tank, you should be able to easily inspect the form material used on yours. Hey, I had to do this with a careful eye on service versus costs. Cautions not to use treated lumber are rooted in fact that any new epoxy attachments needed to secure or serve as deck finish is not feasible - these new fiberglass materials are incompatible with treated wood substrates but treated wood is substantially less costly than marine grade plywood and non-wood composites. Treated materials are a must: it's heavier but will not rot in our lifetime, finished with marine carpet and adhesive. All of that rotted out and I replaced it with 1/2" treated plywood decking and miscellaneous supports, with added 2" x 2" stringers for attachments in some locations. This was also decked with plywood and carpet. Click to expand.Mine is 1989 and they used painted plywood (3/8" to 1/2", varies) below deck serving as forms for the pour in floatation foam and substrate for seats, etc. ![]()
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