Vent Pipes


  #1  
Old 08-08-05, 10:51 AM
J
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Vent Pipes

I'm installing a new bathroom (with a permit) and had a plumber install the rough waste piping (all ABS). The Bathroom is only 5'x8' but the shower head is on an interior wall while the Lav and WC are on the exterior wall with a structural beam above the wall.

There is a 2" Lav riser, a 2" WC vent riser in the exterior 2x6 wall and a 1-1/2" vent riser for the Tub/Shower in the 2x4 interior wall. I intend to stub out from the wall for the Lav with a 1-1/2" pipe and continue the 2" riser up to about 4' and then connect the WC riser and Lav Riser with a horizontally run to a chase space and up to the attic area where I will tie in the Shower vent pipe and run a single 2" vent thru the roof.

Does this sound OK? I want to keep the roof penetrations to a minimum.

Thanks, Joe
 
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Old 08-08-05, 03:45 PM
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Yes...BUT...

Do not use any elbows on the vents unless you are a minimum of 6" above the flood level of the fixture the vent is for. Grade the venting so it drains back towards the sewer. No flat venting, have a slope towards the drains.

You will find more vent info in the thread:

http://forum.doityourself.com/showthread.php?t=226365

Good luck with your project....
 
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Old 08-08-05, 06:16 PM
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Lav Drain Size?

What's the normal drainsize for a Lavatory?

Should I stub out of the wall with 1-1/4" or 1-1/2"?

Thanks, Joe
 
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Old 08-08-05, 06:19 PM
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Stub out with 1.5" for a lavatory... The drain on the lav itself is 1.25" but the trap for it is made to adapt to 1.5" pipe... It will be better for code and for drainage...
 
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Old 08-08-05, 06:22 PM
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Thanks

Thanks guys, exactly the info I needed.

 
 

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