- Sun Nov 10, 2013 2:54 pm
you need to look at shear strength of the foam. pourable foam i believe lacks it. hence why manufacturers use it for flotation in between the layers on the floor to make it unsinkable/less sinkable if theres a puncture in the fiberglass layers itself. i would think that for the boat to be strong, it would have to be pretty thick as i couldn't see the foam, even at a couple inches thick and with layers of fiberglass being strong enough. plus this foam would soak up water pretty bad and cause everything around it to rot and as your primary core, this wouldn't be the stuff to use. id just save up and make a boat out of divinycell, or if you can spring for it, core cell. these foams are purposed for hull structure. pourable foam i think would be a bad idea. i would rather direct you towards using the hard insulation foam at hd or lowes before id suggest pourable. and even insulation foam i believe lacks that shear strength. why not try one of the skiffs like the fs18 from bateau?