I stuffed most of the voids between the sole and stringer with this 2lb closed cell foam that I cut to shape. This was scrap foam from a 53' boat stringer build.



I used PL glue and screws to secure the floors to the stringers. I mainly used the PL glue to "sure up" the tops of the stringers to ensure good contact. The sub floor was stuffed good with the shaped 2 lb foam so that they also provide support. I also "taped" in the sides using foam chamfers and 2 layers of 2 oz csm and taped in the inner floor to the main stringers using a layer of 3610.