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== Insulation ==
In living spaces, above the waterline, the hull should be insulated with closed-cell fire-retardant polyurethane foam or rubber foam like Armaflex.<ref>Armacell Engineered Foams, http://www.armaflex.com/</redref> Armaflex sheet is a closed-cell, flexible elastomeric foam insulation.
The primary purpose of insulating is to control condensation. Secondarily, it reduces heating and air-conditioning losses through conduction.