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?
What type of furnace vent pipe is this
exhaust-ventfurnaceroofvent
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This is one of those questions that is very difficult to answer properly with the info given. Although it sounds like you may be able to downsize the vent/flue because to the change over to a high efficiency furnace, there are lots of considerations depending on the exact equipment you have. The water heater is a different application as well.
In your particular case, I think it would be wise to bring in a qualified HVAC tech to analyze the situation and give you a safe plan ideal for your needs and location. Never cut corners when fire and poisonous gas hazards can result. Good Luck
Maybe the links have changed, but if this is the product that you were looking at...
then yes, I have had experience with roof to wall vents... they work; but they are for the tops of roofs, where they meet a wall (like for an addition on the side of a house). So, I don't think it would be useful for your house, if I understand your question correctly. If you installed soffits (or found a way to vent without them), then you may want to use a ridge vent (kind of the same thing), but I don't really understand a way around adding/building an overhang in order to have soffits.
I would like to see a pic of your way/solution around soffits (6" vents installed equidistant from each other).
Best Answer
Asbestos. (lgam.info/asbestos-cement-pipe)
You'd need cast couplings: (ebay, Smith Blair Industrial Ad)