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Old 06-30-2011, 03:34 PM   #1
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Flu pipes and insulation


Per my understanding, double wall pipe from the ceiling line all the way through the attic and out is code? Can I assume it is then safe to blow cellulose insulation right up against the pipe in that case? I have an 80% furnace and demand HWH (separate flues of course) and just get a little nervous about that I guess.

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Old 06-30-2011, 07:00 PM   #2
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Flu pipes and insulation


You'll need to check the pipe manufacturer For sure but I would guess you will still need 1" or 2" clearance from any combustibles.

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Old 06-30-2011, 07:13 PM   #3
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Flu pipes and insulation


How is that typically done in new homes? Do they use a triple wall or something or slip a larger single wall pipe around as a sleeve before filling with insulation?
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Old 06-30-2011, 07:58 PM   #4
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Flu pipes and insulation


This may explain it better, http://www.northlineexpress.com/Imag...structions.pdf

Its called an attic insulation sheild.
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