Brooke Stabbert
New Member
Hello,
This is my first post in this forum, but I've really appreciated the information I've found here. Thanks Terry et al!
I am remodeling a 1916 craftsman home in Seattle and expanding the basement bathroom. I tore up the slab in that corner of the house and laid down this plumbing. I was hoping to get feedback confirming it is OK prior to closing everything up. I'm not getting it inspected, but I want it all to be correct and meet code.
The layout will be a sink against the wall on the left (top left in first picture), toilet, and then tub/shower on the right (top right in first pic). The 3" line in the right foreground is for a laundry closet and comes up in the wall between the bathroom and laundry closet. The 3" line in the left foreground also will come up in the wall between the bathroom and laundry closet, but continue up to drain the master bath.
Everything connects into the existing 4" cast iron drain line (top left in first pic, connected via Fernco rubber coupler) that dumps into the primary 4" stack/drain. The upstairs master bath connects into the 4" drain downstream of the backwater valve as it is all above the level of the next upstream manhole cover. The laundry and the downstairs bath all flow through a 3" backwater valve since they are below the level of the next upstream manhole. The backwater access/cleanout extends above the slab and will come out inside the bathroom vanity cabinet. The lav sink is on the left end of the wall, but the drain will have to run horizontally to the right through the studs (non-bearing) to intercept its vertical vent and drain down through the stud wall. It exits the wall with a 45 into a long sweep into the 3" horizontal. It then flows to the backwater valve and the main drain.
The toilet flange is not installed yet, but will come off the straight arm of the 3" Y to the right of the backwater valve. It is wet vented by the 3" line from the lav and the tub/shower. Both the lav and the tub have their own 2" vent as does the laundry. The vent for the tub comes off the trap arm at 45 off vertical to tuck into the stud wall and go up from there.
There will be cleanouts for the for each of the 3" drains running down the laundry wall accessable behind the washer and dryer.
Specific Questions:
1. I can connect the vents to the main stack either in the 1st floor joist bay, which is above the next manhole cover, but below the elevation of the main floor drains (even though the main floow drain connect into the stack below the flood rims of the basement bathroom), or I could connect the vents to the main stack in the attic space above the main floor. The first option would allow the the upstairs drains to flood the downstairs bathroom via the vents if the main drain is blocked. That would not happen if I connected through the attic, but that seems like it might be overkill. Thoughts?
2. I am wet venting the toilet via the vents of the lav and tub. However, wet vents are only allowed within one or two bathroom groups. Since the laundry drain connects to the main drain via this bathoom, but is vented separately, does that invalidate the ability to wet vent the toilet?
Thanks!!!!
This is my first post in this forum, but I've really appreciated the information I've found here. Thanks Terry et al!
I am remodeling a 1916 craftsman home in Seattle and expanding the basement bathroom. I tore up the slab in that corner of the house and laid down this plumbing. I was hoping to get feedback confirming it is OK prior to closing everything up. I'm not getting it inspected, but I want it all to be correct and meet code.
The layout will be a sink against the wall on the left (top left in first picture), toilet, and then tub/shower on the right (top right in first pic). The 3" line in the right foreground is for a laundry closet and comes up in the wall between the bathroom and laundry closet. The 3" line in the left foreground also will come up in the wall between the bathroom and laundry closet, but continue up to drain the master bath.
Everything connects into the existing 4" cast iron drain line (top left in first pic, connected via Fernco rubber coupler) that dumps into the primary 4" stack/drain. The upstairs master bath connects into the 4" drain downstream of the backwater valve as it is all above the level of the next upstream manhole cover. The laundry and the downstairs bath all flow through a 3" backwater valve since they are below the level of the next upstream manhole. The backwater access/cleanout extends above the slab and will come out inside the bathroom vanity cabinet. The lav sink is on the left end of the wall, but the drain will have to run horizontally to the right through the studs (non-bearing) to intercept its vertical vent and drain down through the stud wall. It exits the wall with a 45 into a long sweep into the 3" horizontal. It then flows to the backwater valve and the main drain.
The toilet flange is not installed yet, but will come off the straight arm of the 3" Y to the right of the backwater valve. It is wet vented by the 3" line from the lav and the tub/shower. Both the lav and the tub have their own 2" vent as does the laundry. The vent for the tub comes off the trap arm at 45 off vertical to tuck into the stud wall and go up from there.
There will be cleanouts for the for each of the 3" drains running down the laundry wall accessable behind the washer and dryer.
Specific Questions:
1. I can connect the vents to the main stack either in the 1st floor joist bay, which is above the next manhole cover, but below the elevation of the main floor drains (even though the main floow drain connect into the stack below the flood rims of the basement bathroom), or I could connect the vents to the main stack in the attic space above the main floor. The first option would allow the the upstairs drains to flood the downstairs bathroom via the vents if the main drain is blocked. That would not happen if I connected through the attic, but that seems like it might be overkill. Thoughts?
2. I am wet venting the toilet via the vents of the lav and tub. However, wet vents are only allowed within one or two bathroom groups. Since the laundry drain connects to the main drain via this bathoom, but is vented separately, does that invalidate the ability to wet vent the toilet?
Thanks!!!!
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