Hi and thank you for any knowledge/insight. I have done mostly repair plumbing and now I am having difficulty wrapping my head around my DWV system for a new bathroom in a very old, very small house. Most of my reading shows layouts with soil stacks in the wall etc. I don't have such a system.
The constraints are as follows:
Single story house, 3" drain pipe (to septic).
The bathroom (only bathroom) is being built onto a slab. I am using rough-sawn 2x8 framing, so that is the height I have to work in.
The house is built (in 1860) like a barn, post and beam, with no walls to put anything in. Everything is in the floor or exposed. I may just leave the supply exposed.
The bathroom is small (<6X8) with a need to have the drain for the washer tie in from the "far end" and go through the bathroom.
The order of fixtures from farthest to nearest is washer from other side of bathroom, sink, tub, toilet connect to existing 3" drain.
There is no vent in the line at this point (the part of the house with a vent is being demolished). NY state permits AAV's but only if there is at least one true vent
I am having a lot of trouble placing (fitting) a vent and and figuring a sensible layout. With no wall space I am hoping I can share a single vent pipe among all of these fixtures with no above floor connections.
I also am not clear if one can use a combo (tee/wye) directly under a toilet - in my limited experience I have only seen a closet bend with nothing directly upstream of the toilet.
According to my reading the washer itself would require a 2" drain, I therefore figure the pipe serving the washer, sink and tub should be 3" before tying in with the line at the toilet. Seems a bit much..?
Can this then tie into the drain under the toilet using the previously mentioned combo? or do I need the toilet to closet bend into the combo laying flat.
Also, if I tee off a vent somewhere in the middle can it serve all of these? that is to say: I tee the vent off upstream of the toilet within 5ft of the washer - Is that proper venting, and is 2" enough?
One more, If I kept the gray water fixtures separate from the toilet, could I (and how so) share the vent? I suspect the connection would need to be upwards of 42" above the drain line? Or is that just not done for gray water.
Oh I doubt I made myself clear, but I hope someone finds it worthwhile to clarify.
thank you
John
The constraints are as follows:
Single story house, 3" drain pipe (to septic).
The bathroom (only bathroom) is being built onto a slab. I am using rough-sawn 2x8 framing, so that is the height I have to work in.
The house is built (in 1860) like a barn, post and beam, with no walls to put anything in. Everything is in the floor or exposed. I may just leave the supply exposed.
The bathroom is small (<6X8) with a need to have the drain for the washer tie in from the "far end" and go through the bathroom.
The order of fixtures from farthest to nearest is washer from other side of bathroom, sink, tub, toilet connect to existing 3" drain.
There is no vent in the line at this point (the part of the house with a vent is being demolished). NY state permits AAV's but only if there is at least one true vent
I am having a lot of trouble placing (fitting) a vent and and figuring a sensible layout. With no wall space I am hoping I can share a single vent pipe among all of these fixtures with no above floor connections.
I also am not clear if one can use a combo (tee/wye) directly under a toilet - in my limited experience I have only seen a closet bend with nothing directly upstream of the toilet.
According to my reading the washer itself would require a 2" drain, I therefore figure the pipe serving the washer, sink and tub should be 3" before tying in with the line at the toilet. Seems a bit much..?
Can this then tie into the drain under the toilet using the previously mentioned combo? or do I need the toilet to closet bend into the combo laying flat.
Also, if I tee off a vent somewhere in the middle can it serve all of these? that is to say: I tee the vent off upstream of the toilet within 5ft of the washer - Is that proper venting, and is 2" enough?
One more, If I kept the gray water fixtures separate from the toilet, could I (and how so) share the vent? I suspect the connection would need to be upwards of 42" above the drain line? Or is that just not done for gray water.
Oh I doubt I made myself clear, but I hope someone finds it worthwhile to clarify.
thank you
John