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I need to extend my furnace vent pipe up 2 foot above the ridge of my roof to comply with IBC. So I need to couple this pipe somehow and extend it up. Any idea what type of pipe this is and how I would extend it?

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    My first thought is asbestos
    – Steven
    Commented Jan 10, 2015 at 16:33
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    Definitely looks like asbestos. It's a fiber, not metal or plastic, and the only fiber that I am aware of that could possibly be used for a furnace vent would be asbestos. You might want to consider replacing the entire thing.
    – Mark
    Commented Jan 10, 2015 at 19:01

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Asbestos. (lgam.info/asbestos-cement-pipe)

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You'd need cast couplings: (ebay, Smith Blair Industrial Ad)

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