Steel Hulled Freak
Join Date: Aug 2008
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Re: NEED advice...steel boat insulation
The boat was insulated with a professionally sourced closed cell poly - it came in large cylinders with replaceable hoses and heads, etc. The great stuff was only used on edges for the refrigeration. The forward part is done with replaceable Styrofoam panels, which may be glued in place.
If I had to do that insulation again, would do it with removable panels and leave the spray foam out of it, except for the edges of the fridge compartment.
The most important thing isnt so much preventing condensation, but managing flow to the bilges with limber holes, etc.. My current boat has stringers that lack those, and they are going to need replacement before they rust out from accumulated water.
You are lucky in that your boat has minimal longitudinals to catch water this way.