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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/</ref> Armaflex sheet is a closed-cell, flexible elastomeric foam insulation.Aerogel, used in space missions, is also becoming more economical.<ref>http://www.aerogel.org/</ref>
The primary purpose of insulating is to control condensation. Secondarily, it reduces heating and air-conditioning losses through conduction.
Neoprene foam is a soft, flexible and durable form-fitting sponge rubber available in regular and high densities. It provides good thermal and moisture insulation and is resistant to many chemicals and petroleum derivatives. It can be used as an expansion joint filler and as a sound barrier in walls, ceilings or floors.
=== Aerogel ===
Aerogel is a synthetic porous ultralight material derived from a gel, in which the liquid component of the gel has been replaced with a gas.<ref>https://en.wikipedia.org/wiki/Aerogel</ref>
Aerogel has to date been used for insulating engine compartments, ovens, and rocket parts. It is also good at sound damping too. As the material becomes more common it is being used in building construction. <ref>http://www.earth.org.uk/superinsulating-our-living-room.html</ref>
=== Radiant Barrier Insulation ===
Inside the hull, non-watertight bulkheads and other interior fittings are usually screwed to hull stringers. This breaks the paint seal on steel hulls, and can lead to corrosion. Another way of doing this is to attach a neoprene rubber strip to the stringer, using waterproof contact cement. A marine-grade plywood furring strip is cemented to the rubber strip. Bulkheads, etc., are then screwed to the furring strip. This preserves the protective coating of the paint system, and flexibly mounts the interior which reduces [[AcousticIsolation|noise conduction]].
For a furring strip use flame-retardant closed-cell neoprene used in aircraft and trains for seat cushioning because of its fire resistance. Neoprene can be bonded to most surfaces such as metal, glass, wood, grpGRP, rubber, fabrics and most plastics with super-strength neoprene contact adhesive, which is available with high flexibility, super strength, water proof (fresh and salt), and heat proof to 150 °C.
Cabin walls are usually marine plywood with a veneer finish, which doesn’t reduce noise transmission much. Unless you want to listen to every noise from your neighbour or the adjacent head, make the cabin walls hollow, and insulate them with DFM mineral wool or an aerogel sheet<ref>Aspen Aerogel Inc., http://www.aerogel.com/</ref> or use structural insulated panels (SIP). Aerogel is also an excellent thermal insulator, with a value of around R22 per inch.
Cabin soles are marine plywood or marine0grade marine-grade SIP,<ref>http://triloboats.blogspot.ca/2012/01/sea-going-sips-toward-creating-market.html</ref> <ref>http://www.nauticexpo.com/boat-manufacturer/thermal-insulation-panel-22312.html</ref> <ref>
http://duflex.com.au/duflex2/</ref> covered with a hardwood or tile.