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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 ===
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.