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Old 02-26-2011, 08:22 PM   #1
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flexible venting???


I have 2x8 joists, 12" on centre. I have to run a vent line across about a dozen of these !@##$%%^&*(*)!!! lovely solid, inflexible, thick joists. It is impossible to force a 1 1/2" line into the allowable space. I was wondering if there was a flexible venting allowed by code? Any suggestions?

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Old 02-26-2011, 10:19 PM   #2
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flexible venting???


Depend on where you are you could use a cheater vent, if it's not getting inspected it would be fast and easy.

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Old 02-26-2011, 10:19 PM   #3
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flexible venting???


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I was wondering if there was a flexible venting allowed by code?
Are you talking about plumbing vents? If so, then the answer is no, there's no 'flexible' vents allowed.
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Old 02-27-2011, 06:44 AM   #4
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flexible venting???


Sorry -- myopic mind hard at work!!!

I've recently installed a sewer system under the slab in the basement (DWV). I have vertical risers leading to the main floor in several places. These main floor connections need to be connected together and added to an existing roof vent. I have three places where these must be connected. At each sink I have added a negative pressure valve where air can be sucked into the DWV main line; 3 in total. This allows the drain to get all the air it needs. Now, all I need is to vent for positive pressure.

I'm using ABS throughout. I have 3" main to each of two toilets, 2" for the shower and 1 1/2" for everything else. I need to create a vent run between the three rising points. I'll use 1 1/2" ABS to connect the three risers and that should be sufficient to vent the entire system, positively and negatively. Code is mandatory but inspections are not possible. We don't have inspectors -- just consequences.

If flexible vents are not possible, is there some trick to pushing ABS through holes in the joists? Originally I had thought I would just push the vents through a wall space but that is not possible. The same wall is being used for PEX tubing and the water distribution manifold.
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Old 02-27-2011, 12:30 PM   #5
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flexible venting???


The trick I usually use is this :
...






















Cut a bunch of small pieces and buy about a dozen or so couplings.
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Old 02-27-2011, 01:21 PM   #6
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flexible venting???


Why can't you run it below the joists?
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Old 02-27-2011, 09:06 PM   #7
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Why can't you run it below the joists?
Too little headroom and the ceiling will be covered with gyproc.

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