Are they going inside a protected area, like inside of aluminum pontoons - or just on the underside of the boat or ...?
They are not going to be protected. I’ll probably attach them all to a long 2x6 covered in spar polyurethane. They’ll be on the underside of the boat.
Kind of redneck rigging? If the 2x6 is on the bottom you could bolt it on, effectively using the 2x6 as a clamp to hold the foam piece(s) to the underside of the deck. I'd use big washers on the deck because there is bound to be vibration. Hard to visualize exactly what you are working with.
I have 7 billets of varying lengths all about 1x2.5’. I have 32 linear feet of this styrofoam. Also youthful enthusiasm.
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