Basement *VENTING* AND running entire new drain lines.

57_Hemi

Hello everyone.....

After a few days of busting up the old concrete slab in my basement and trenching out areas for the new drains I have a couple questions / concerns I was hoping to get some help on.

1st off, my home was built in the mid 40's so there is nothing but cast iron and clay piping running through out. I wish to swap ALL under slab drains with ABS or PVC etc etc. I will be installing a full bathroom at S/E corner of basement and a laundry area at the N/W corner of the basement.

So 1st question is......

Since there is a 3" main stack shooting down the center wall on the N side of the home can I vent into this stack for my laundry area approximately 12ft away along front wall at the N/W side via a 3x3x1.5" TEE? Im guessing this would be considered a "wet vent". This stack continues straight up thru the home and out the roof which also picks up a toilet & vanity on above floor.


2nd question.......

For my bathroom on the S/E side of home when running drains under the slab is it proper practice to tie in vents of tub, toilet, vanity "under slab" then have only 1 1.5" line running up the wall into existing vent stack (which is used for kitchen above).... OR do I make seperate runs for venting each fixture directly up into framed walls then connect all three (one into another) in line than into the existing vent stack.

Obviously I am not a licensed plumber but I do have plenty of experience with installing / repairing various types of plumbing etc etc. However, breaking up my concrete basement and trenching for new lines is surely the biggest job I have tackled all at once to date.......

Asking some of the people at Home Depot or Lowes for any advice regarding this topic is like asking my little old widowed Italian neighbour who does NOT speak a word of english....."THERES JUST NO USE"........lol

I will try to post some pics....meantime any help with this would be great.

Thank you !!

braindead

I think you should replan, you have mentioned tying into two lines that have fixtures on them for a vent, you can't do that unless you are 42in ABOVE the highest fixture connected

TheEplumber

#1. No, that is a waste stack, not a vent stack. Must be 6"" above the highest fixture rim (42" above floor)

#2. Basically the same answer. Can't connect vents together until 6" above flood rim and using drainage fixtures, they need to come off above centerline of the drain being served.
Best bet IMO is to make 2" vent stacks for each corner and vent through roof seperatly or tie back to existing vent stack in attic.

57_Hemi

I see... sorry but what exactly is meant by the term "wet vent" ?

BTW: thanks for the help guys.... really do appreciate this

TheEplumber

Best to use google. I can't type for that long. Makes my head hurt
Also, there are different codes through out the country and once I give my wet vent answer (UPC-03) Someone else will say something different.
If you can get your head around wet venting, you can save time and money though

57_Hemi

Ok.... So I take it you are telling me that my vent must be at 42" above the highest fixture which is my 2nd floor bath (in regards to the laundry area I wanna build in bsmnt on N/W side)

AND

In regards to the bathroom I would like to build on the S/E side than I would have to be 42" above highest fixture on the existing stack which would be my 1st floor kitchen sink.

So basically there is no other way around it than running 2 seperate 2" lines from basement up to attic and tie back into existing vent stacks OR out the roof as Eplumber mentioned.

hmmmmm..... problem I have is that my home is a small 1 1/2 storey and my attic is extremly tiny (height wise) and tough to maneuvor...... basically the 2nd floor is really part of the attic if u get what i mean..... so instead of a triangular shaped attic that would be 10 ft in height I have my 2nd floor living space thats 8 ft high (with the exterior walls slanted inwards creating the peak of the roof) and above my 2nd floor an attic space of about 2feet in height.

What to do What to do??

57_Hemi

hahaha

I totally understand........ thanks again