Tom Gabriele
New Member
Hey all, I am a DIY homeowner with a strong motivation to do things correctly (and zero credentials). In RI, 2015 IPC, non inspected, ABS allowed.
On the main floor, we have mirror image bathroom groups with a horizontal stack for the sinks, toilets, and tub/shower in that order. Sinks are 1.5" dry vented with a double sani tee, toilets join in with a double wye with 45's, followed by a standalone 3" vent on the stack, then the turn vertical, then the tub/shower combo and shower enter on the vertical with another double wye. The tub doesn't have its own vent, and the shower has an attempt at a vent that comes off after the drop.
Pictures worth 1,000 words, so here's a photo album: https://imgur.com/a/C8bZZ4B
There aren't any current issues the I'm aware of, but from what I can tell, this violates both best practices and IPC if it were new construction today, for a few reasons:
1. Tub/shower can't be wet-vented past the toilets like that
2. The 1.5" vent on the sinks should be 2" if it's a wet vent
3. Back to back toilets even on a "proper" wye like that isn't best practice for when we replace the original toilets with higher-velocity ones
So while I have the one bathroom gutted and plenty of access through the open laundry ceiling below, I'd like to get this up to snuff.
Here are the changes I think would be appropriate, which I could use some conformation on:
1. Replace the 90 turn to vertical and the vertical wye for the tub and shower with a sanitary tee with left and right inlets, 3x3x3x2x2 (https://www.supplyhouse.com/Nibco-I...-Sanitary-Tee-with-90-Right-Left-Inlets-5870R) which would make the turn, upgrade to 2" traps for the tub and shower, and add a dry 3" vent for both of them (going up to the attic and tying in with the rest to go through the roof).
2. Replace the double wye for the toilets with sequential single wyes so they're not entering at the same fitting.
I believe those two changes will make the system functional and passable if it were to be inspected, but could use some help considering I have no credentials. I have done a bunch of reading and research about what the IPC requires and how I can meet it, but I am starting from zero and it's been a real uphill climb.
An additional layer is that the laundry room below has the washing machine and utility sink, both of which currently vent through the existing 3" which is up and around on the horizontal stack (as far as I can tell). My proposed new vent right at the turn to vertical ought to improve their ventilation too, and more ventilation couldn't hurt, right?
On the main floor, we have mirror image bathroom groups with a horizontal stack for the sinks, toilets, and tub/shower in that order. Sinks are 1.5" dry vented with a double sani tee, toilets join in with a double wye with 45's, followed by a standalone 3" vent on the stack, then the turn vertical, then the tub/shower combo and shower enter on the vertical with another double wye. The tub doesn't have its own vent, and the shower has an attempt at a vent that comes off after the drop.
Pictures worth 1,000 words, so here's a photo album: https://imgur.com/a/C8bZZ4B
There aren't any current issues the I'm aware of, but from what I can tell, this violates both best practices and IPC if it were new construction today, for a few reasons:
1. Tub/shower can't be wet-vented past the toilets like that
2. The 1.5" vent on the sinks should be 2" if it's a wet vent
3. Back to back toilets even on a "proper" wye like that isn't best practice for when we replace the original toilets with higher-velocity ones
So while I have the one bathroom gutted and plenty of access through the open laundry ceiling below, I'd like to get this up to snuff.
Here are the changes I think would be appropriate, which I could use some conformation on:
1. Replace the 90 turn to vertical and the vertical wye for the tub and shower with a sanitary tee with left and right inlets, 3x3x3x2x2 (https://www.supplyhouse.com/Nibco-I...-Sanitary-Tee-with-90-Right-Left-Inlets-5870R) which would make the turn, upgrade to 2" traps for the tub and shower, and add a dry 3" vent for both of them (going up to the attic and tying in with the rest to go through the roof).
2. Replace the double wye for the toilets with sequential single wyes so they're not entering at the same fitting.
I believe those two changes will make the system functional and passable if it were to be inspected, but could use some help considering I have no credentials. I have done a bunch of reading and research about what the IPC requires and how I can meet it, but I am starting from zero and it's been a real uphill climb.
An additional layer is that the laundry room below has the washing machine and utility sink, both of which currently vent through the existing 3" which is up and around on the horizontal stack (as far as I can tell). My proposed new vent right at the turn to vertical ought to improve their ventilation too, and more ventilation couldn't hurt, right?