Yesterday I had to pull up the floorboards to run some DC power cable, I was surprised to find that the underdeck space from forward to aft is completely filled with loose styrofoam planks of about 6 inches across and an inch deep.
I dont know if they're intended for sound absorbtion, or for emergency flotation, or both. But I'm glad its there - I'd made a quip a few weeks ago about filling the underdeck space with 2 liter bottles; now I dont have to
At any rate, I'd never heard or seen that before and I was wondering if filling the underdeck space with styrofoam planks is unusual. I'm no boat building expert by any means.