Practical Boat Owner - - Practical -

Ma­te­ri­als used by the world’s lead­ing su­pery­acht builders are not par­tic­u­larly spe­cialised, or ex­pen­sive, just used in vast amounts. The su­pery­acht yards often de­ploy large quan­ti­ties of Rock­wool, for ex­am­ple, avail­able from any DIY store or builder’s mer­chants. They cram it into over­head voids in large over­lap­ping slabs.

They also use prod­ucts we’re fa­mil­iar with such as 3M’s Thin­su­late, or the US-made Re­flec­tix or EU-made Ar­maflex. Metal yachts, and even some com­pos­ite ones, also use spray foam, much as you might find in your at­tic.

Tanks are af­ten sprayed with a ther­mal bar­rier coat of foam to stop big heat dif­fer­ences be­tween the tank’s con­tents and the in­te­rior of the yacht. Big tem­per­a­ture dif­fer­ences lead to con­den­sa­tion

rock­wool is used in huge quan­ti­ties to fill ev­ery un­der­deck void. This is es­pe­cially use­ful in coun­ter­ing loss or gain of heat in ar­eas with tem­per­a­ture ex­tremes, such as the trop­ics or po­lar regions

An alu­minium bulk­head has been sand­wiched, first with rock­wool (brown), and then with Thin­su­late (white) and fi­nally with a foil bar­rier. This will pre­serve lo­calised tem­per­a­ture zones and dampen res­onated noise

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