Is there any sort of insulation you can use around a furnace vent pipe if it’s double walled?
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Replies
Depends on how it's rated.
how whats rated?
Look into rock wool insulation. You'll have to research it's appropriateness for your application; but I know it's often used around flues where they extend into attics otherwise insulated with cellulose. The cellulose isn't supposed to be right against the flue because it's technically flammable (paper-based)... even though most (all?) brands have some level of anti-ignition product in them.
Do note that some flues, even though double wall, may not be rated to be completely surrounded by insulation.