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  1. 08-10-2009, 02:29 PM #1
    Greg Frazier's Avatar
    Greg Frazier Guest

    Default Foamed insulation at furnace

    Found this today. It appears to be expanding foam used to seal the chimney. It was painted to match the wall. I called it out as improper material. Does anyone know if any of this stuff is high temperature suitable? I know the orange stuff can be used in garages to seal firewalls, but this was yellow foam. Also noted that the water heater is not venting above the furnace vent.

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  2. 08-10-2009, 02:34 PM #2
    Jerry Peck's Avatar
    Jerry Peck
    Jerry Peck is offline Member
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    Default Re: Foamed insulation at furnace

    If that is Type B gas vent, which it should be, the insulation needs to be kept back 1" minimum ... regardless of any temperature rating of the foam insulation.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
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