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Leaning B Vent

jir220
jir220 Member Posts: 6
edited September 17 in Gas Heating

The furnace b vent pipe is leaning a bit, not being perfetly vertical. I think its like this for a couple years but just recently I noticed it was touching a wood at garrare roof. I trimmed the wood and added straps. Is the leaning pipe of itself a problem? E.g. combustion related? Or can I keep it like this for a few more years before we replace the whole system? Also do I need to add more straps to support it e.g. from the bottom?

20250913_120810.jpg

Comments

  • jir220
    jir220 Member Posts: 6
    20250916_123420.jpg
  • jir220
    jir220 Member Posts: 6
    20250916_165614.jpg
  • jir220
    jir220 Member Posts: 6
    20250916_163036.jpg
  • Mad Dog_2
    Mad Dog_2 Member Posts: 8,322

    As long as its not leaking, I'm more concerned about the distance/height to that window...Mad Dog

    Consulting by Mad Dog & Matt Jr.
    jir220STEAM DOCTORpecmsg
  • jir220
    jir220 Member Posts: 6
    edited September 17

    thanks, do you mean leaking water or gas? :) no water leaks. As far as gas I did not notice any smells nor any co2 in garrage nor indoor. Does it normally happen that these start to lean? I did walk down our street and it seems none was really straight. Also none was next to window :) The distance to window is probably 5 or 6 feet, its like this for 20y already..

  • jir220
    jir220 Member Posts: 6
    edited September 17

    Any more straps to support the pipe from bottom or thats not a concern?

  • mattmia2
    mattmia2 Member Posts: 14,136

    it needs more support inside. it is questionable at best if that has the required clearances to a lot of things above the roof.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,533

    It needs to be 10' away from the window or the flue would have to be above the house roof.

  • Jamie Hall
    Jamie Hall Member Posts: 26,357

    Overall… sloppy work.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    mattmia2
  • Bob Harper
    Bob Harper Member Posts: 1,130

    B-vent must terminate above the roof—as in that upper roof. It's within 8 LF. That would require external lateral support plus spacing 1" off the shingles and facia board. Below the roof, the B-vent does not have the requisite base support nor B-vent continuing to the appliances in an unconditioned space nor the proper transition to single walled pipe nor proper support on the vent connectors nor the proper sizing of the vent connectors I'm sure. If you provide the BTU/hr input rating, vent connector diameters, lateral offset and vertical vent rise we can reference the gas codes for sizing. You venting does not have two point stability. Complete makeover or switch to power vented out the sidewall and try to manage condensate without freezing. Seal your ducts and run combustion analysis.

  • pecmsg
    pecmsg Member Posts: 6,458
    image.png
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,533

    I thought it was 10'

    pecmsg
  • Bob Harper
    Bob Harper Member Posts: 1,130

    That's for 'chimney'. See the IRC Ch. 24 gas code (residential portions of IFGC)/ NFPA 54 NFGC. Chimney's also require min. 3ft above even a flat roof while 'vents' do not. See the listing for that brand. Generally start at 12" plus any allowance for snow.

    HTH

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