|Posted by Phil on March 21, 2004 at 17:35:44:|
|In response to Re: Venting lavatory sinks|
: : : : I am remodelling my bathroom and the position of the vanity basins is to be moved. I thought I could just drain the new basins into the same drain that the shower and bath go into but looking around your site it seems that this is more complex. I had never heard of venting until I checked out your site! Can someone advise me on how I should do this?
: : : : The bathroom is on the top floor. At present the bath tub drain runs about 10' sloped horizontally, the shower drain runs about 5' - they both are 1 1/2" ABS pipes which join in a Y into a 2" drain which has a 2" vent pipe to the roof which eventually T's into a 3" pipe out through the roof (many other 2" and 3" pipes T into this as well). The existing vanity basins have their own vent pipe but I can't get to this because of the joists.
: : : : On the same wall that the new basins are to be installed there is another 3" vent pipe but I am not sure what it is venting as there is no bathroom beneath this.
: : : : So my questions:
: : : : Hope you can help,
: : : Reply:
: : : 1. Is it ok to run the new vanities into the same drain as the bath and shower?
: : : Good Luck. e-plumber
: : Thanks. Both tub and shower have p-traps which connect to 1-1/2" drain pipes, these join at a Y joint (10' from tub p-trap, 5' from shower p-trap). After the Y the drain becomes 2" and about 1' later a T takes the drain vertically down and the vent up to the attic space where it Ts into a 3" pipe that goes through the roof. I hope this is ok - I haven't touched this and as far as I know there has been no problems i.e. everything drains efficiently (although when first running the shower it sounds like the bath is draining).
: : From your answers it looks like I can join the lav drain to the tub/shower drain and tie into the other vent - this is good news and looks very easy to do.
: : Thanks again,
: Just so you are aware. The tub and shower are not vented, according to UPC code. The shower drain and p-trap are undersized. A vent needs to be taken off each, prior to them tying together. The vent is way too far away to be venting 1-1/2" traps. If you tie the lav in, it sounds like you will be tying into a trap arm, not a drain line--a no-no. Where I live, this is not even close to code. Quoting UPC code, you may be under another.
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