Venting layout


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Old 06-02-22, 11:23 AM
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Venting layout

Getting ready to start running vent pipes for our new construction home. Appreciate any suggestions on our planned layout?

Green line is our planned route with 2 and exiting Through side gable wall (no vented soffit)

Red line I would LIKE to connect and exit with the bathrooms, but thinking the length may not be up to code or work?

Thanks for any help.


 
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Old 06-02-22, 12:05 PM
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Why are you wanting to vent out a side wall? Most go vertically through the roof. You can go out the side, and it's often done when retrofitting old homes, but you have to turn vertical outside and run the vent up above the roof (ugly).

We don't know where you are located so check your codes.
"...vent pipes should extend to outdoors above the building roof and
should terminate vertically not less than 6" above the roof surface (nor more than 24") and must be at least 12" from any vertical surface."

In some cases you can vent out a side wall but it may be required to be above the highest windows in the house and may also require the end of the vent to be a certain distance away from the house.
 
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Old 06-02-22, 01:07 PM
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Original plan was through the roof, but if I could avoid putting holes through the metal roof I thought the upper gable might be another option.

Sorry, I forgot to list my area is Louisiana and our code is 2012 IPC. We can do 10 from ground and from openings.

Does the layout look ok otherwise? Thanks for your input.
 
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Old 06-02-22, 02:47 PM
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The length of your red line should not be a problem. It will be difficult to run the piping though because you probably have no height in your attic along that wall. And you really don't want to bore holes that big in every load bearing joist along the outer wall.

Will you be going vertical with the vents at each fixture until up in the attic, then going horizontal (with proper fall) and combining in the attic? If so, that is OK.
 
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Old 06-02-22, 03:49 PM
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Its a metal building frame, so not much is actually load bearing. I do have access to run my vent pipe between the top of that back wall and the steel framing. I will be coming straight up from each orange and blue dot (except kitchen sink with window). Id like each vent to connect to the main pipe running along the joists above and through the attic to outside. Could this work?
 
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Old 06-03-22, 05:34 AM
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Yes, that sounds doable. The good thing is that once in the attic you no longer have to follow the walls or make 90s. You can diagonal which will help keep the vent lines shorter. And don't forget to properly support the vent piping in the attic so it doesn't sag over the years.
 
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Old 06-03-22, 06:37 AM
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Thanks Pilot Dane. Yeah I can shorten it some in the attic. I plan on using some strapping to help support the venting. My concern was this 40 portion in the IPC code and if Id have to go up from a 2 vent. The sizing chart shows max length according to my DFU should be around 125 ft. Is this considered a different type of vent?



 
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Old 06-08-22, 11:14 AM
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You need a main stack vent, which will be 3" or 4". Likely from the bathroom group, but could be closer to the main drain exit if that's easier.

2" is minimum for the bathroom group, and 1.5" is sufficient for the kitchen/laundry. For 2 full baths, you might need to upgrade to 3" based on DFUs (I haven't done the math).

As you pointed out, over 40' will need to go up a size. So it looks like the kitchen/laundry will need 2"
And I'd probably run 1 bath with 3" and the other bath with 2, tying into the 3".
 
 

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