Sailing SV Delos · video

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Brian walks through three insulation options for SV Delos, an aluminum catamaran undergoing a full thermal and soundproofing refit.0:05 Spray foam is the first option: easy to apply but nearly impossible to remove if hull access is needed later, which rules it out.0:40 The second option is Nealon, a closed-cell extruded polyethylene foam bat rated at 25 kg per cubic meter that neither absorbs water nor retains odors.1:18 Brian tests two attachment methods — metal insulation pins pressed through the foam and capped, or a peel-and-stick adhesive backing — and favors the pins for their removability.1:31 A core concern throughout is condensation-driven corrosion: any gap between insulation and aluminum hull that traps moisture without oxygen can corrode the metal.3:06 Two thermal spray coatings — Mass Coat DTM and Pyrotec T35 — are tested as a roughly 2 mm base layer directly on the aluminum to break thermal bridging at exposed metal edges such as windowsills.3:26 Brian notes that even well-insulated panels leave cold strips wherever bare metal is exposed, causing drip condensation.4:35 He asks viewers with aluminum or metal boat insulation experience to weigh in via comments.4:55

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