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Re: Single wall versus double wall (sardine)

Since a boat 99% of the time uses a deck iron for passage of single wall pipe up through the deck and a conical head tops the iron on the exterior, insulated pipe is never used. Single wall pipe down below is the norm. Some will put grilles on the pipe below decks to avoid accidental contact, but there's no insulating value in that accessory. Compromised draft or excessive creosote generation has not been an issue. Insulated pipe is used for residential installs. A/NSW