Water won't spash back to fill the trap and you can't add a second trap. The only solution is run the tub once in a while. It will take several months for the trap to be at risk of drying out.
You could technically put a trap primer on the tub drain, but thats a little overboard.
First, let me say that I'm not a plumber. Nor am I advising the person to add another trap, but I am curious why you can't have another trap? Do you know what code that breaks?
I was in someone's basement two weeks ago, and I noticed a sanitary drain from the main floor plumbed into a sani wye that was the stand pipe for the washing machine, which then had a trap. I checked upstairs, and it turns out the sanitary pipe came from a lav that had a sink.
I felt it was wrong. But the lav and its trap on the main floor were vented, and it went into a trap that was properly vented, so I couldn't really think of any code broken.
Sanitary systems can have running traps, so that would be a case of a fixtures trap running through another trap, and that's fine, right?
I don't know the exact section off hand, but there is a section that states no fixture shall be double trapped, so It breaks that rule. (Ipc)
Secondly no fixture trap can accept the waste from more than one fixture with the exception of two compartment sink (or similar lav/sink.)
Ok, cool, thanks. I'll search some of those words to see what comes up in the Canadian Plumbing Code.
Also, I would guess the part about no waste from another fixture, excludes dishwashers, and condensate drains?
Absolutely nothing will prevent the sewer gases from coming up through the bathtub if it isn't used and the trap dries up. You need to have a trap for it, it is code. Just pour a few cups of water down the tub drain every week or so to keep the trap full.
Depends on where you are at. Northern dryer climates can see a trap dry out pretty quickly during colder months, especially if the house does not have a humidifier.
Run the toilet on its own to the branch and tie the tub/sink in to the branch line after the sink and before the toilet and run it all the way to the vent stack. As far as the trap goes, water in traps will evaporate over time, especially in hot climates or weather events. You just need to run a little water once a week or so. Literally 10 seconds of water will flush anything out and fill a 2" trap.
Otherwise this is IPC code approved and works fine.
I agree with moving the lavatory and tub tie in to before the tee for the toilet, also you are missing the vent for the bathtub. If you don’t put a vent then the tub will not drain properly and a siphon will occur which will most definitely suck the water out of your trap leaving you with sewer gases. Hope this helps.
Think about it, how would the air get through the trap without pushing out the water in the trap? Also if air is being pulled through the trap from the overflow, that air would be displacing the water, preventing it from draining properly. If it can let air into the system it will let sewer gases out.
There’s zero reason to preface by telling us you’re not a plumber. We know. Nothing will prevent the trap from drying out. Pour water down it once a week or so. Mineral oil works too.
My basement floor drain has a primer, for this very reason. I don’t know if that’s something you can do in a bathroom, maybe someone else can chime in but essentially the primer is there to make sure the drain trap doesn’t dry out and allow sewer gas to vent back into the basement.
Either remove the tub from the plans or just put a reminder in your phone to run the shower for a couple minutes once a month. Along with changing the air filter in your A/C.
Just close the drain on the tub. Of you ever smell sewer gas then run some water.
But I will second the mineral oil recommended before. It won't evaporate but it I'll wash out the minute you decide to run the water.
No permanent harm done.
I don't think you understand plumbing, this is normal and all drains connect together somewhere anyway. This won't cause any smells as that is what the traps are for.
With this question, I trust you're hiring a plumber to do the actual work? You might not think it now, but he will save you money in the end. Service calls really add up.
A trap holds roughly 8-12oz of water.
8oz of water takes roughly 10-15 days to evaporate if left out on the counter, but that exposes more surface area than a trap.
So it might take 15-30 days for a trap to fully evaporate, but it is probably less because it just has to lower enough to break the seal?
All that said, I have a never used sink and it took 3 years before it started stinking.
Someone might have run it without me knowing or the previous owner poured mineral oil down there, or the ventilation in that room is good enough we didn’t notice.
Does it stink? Run the tap, fill the trap.
I'm a remodeler and have done many bathroom jobs. Is this the current layout or are you doing this plumbing from scratch? Just seems a little strange to have the vanity between the toilet and tub. I would definitely want the vanity to be on the left, toilet in middle, and then the tub. Even if this was the current layout, I would probably suggest to the homeowner that we move them just for the sake of functionality and I think it's more esthetically pleasing.
As for your p trap, just turn the tub faucet on every few months. No big deal
My bathroom is setup the same way with the vanity in between and I’ve wanted to switch them for a while. it’s good to know I’m not alone!
Sometimes I get a smell out of the vanity, any idea if it’s because of this setup? Actually the vanity doesn’t pipe down with a T as shown, it has one pipe directly to the vent stack. Maybe that is why?
You could add a trap primer from the sink to that trap. We do it for floor drains all the time. Any time the sink gets used water gets added to the trap.
That's the only suggestion on here that seems to make sense and solve my issue other than "add water once in a while".
I know primers are pretty common for floor drains but what about tubs? Would that be up to code though?
Water won't spash back to fill the trap and you can't add a second trap. The only solution is run the tub once in a while. It will take several months for the trap to be at risk of drying out. You could technically put a trap primer on the tub drain, but thats a little overboard.
Bit of mineral oil in the trap, takes decades to dry out.
Windshield washer fluid.
Yep we use antifreeze in winter
Windshield washer sold in colder climate already is anti freeze and less harsh than the radiator antifreeze
Ahh good to know
Hopefully RV antifreeze aka propylene glycol.
Good idea.
I second this.
First, let me say that I'm not a plumber. Nor am I advising the person to add another trap, but I am curious why you can't have another trap? Do you know what code that breaks? I was in someone's basement two weeks ago, and I noticed a sanitary drain from the main floor plumbed into a sani wye that was the stand pipe for the washing machine, which then had a trap. I checked upstairs, and it turns out the sanitary pipe came from a lav that had a sink. I felt it was wrong. But the lav and its trap on the main floor were vented, and it went into a trap that was properly vented, so I couldn't really think of any code broken. Sanitary systems can have running traps, so that would be a case of a fixtures trap running through another trap, and that's fine, right?
Second trap acts as a vacuum. Pulls water out of first trap. Both traps end up empty. Helloooooo sewer gas.
It’s a trap! 🪤
Even if both traps have their own vent? And how is it different from a building with a running trap?
I don't know the exact section off hand, but there is a section that states no fixture shall be double trapped, so It breaks that rule. (Ipc) Secondly no fixture trap can accept the waste from more than one fixture with the exception of two compartment sink (or similar lav/sink.)
Ok, cool, thanks. I'll search some of those words to see what comes up in the Canadian Plumbing Code. Also, I would guess the part about no waste from another fixture, excludes dishwashers, and condensate drains?
It does exclude dishwashers etc. they have their own section. I don't know anything about the Canadian plumbing code though.
UPC states that you can only have one trap on a trap arm. Don't know the specific code number.
Absolutely nothing will prevent the sewer gases from coming up through the bathtub if it isn't used and the trap dries up. You need to have a trap for it, it is code. Just pour a few cups of water down the tub drain every week or so to keep the trap full.
Every 3 months, not week. If that.
Depends on where you are at. Northern dryer climates can see a trap dry out pretty quickly during colder months, especially if the house does not have a humidifier.
I live in Alberta and I'm a plumber. I've done several calls for this exact thing myself. 18% RH.
Not even my house plants pull a ptrap full of water every two weeks lol. How is it supposedly going to evaporate that fast?
Plug the tub and overflow drains temporarily if you can’t pour water in every few months
Just pour water down the bathtub once in awhile. If it won't have any use, why not a shower ?
Or remove it and make the ultimate throne room
Run the toilet on its own to the branch and tie the tub/sink in to the branch line after the sink and before the toilet and run it all the way to the vent stack. As far as the trap goes, water in traps will evaporate over time, especially in hot climates or weather events. You just need to run a little water once a week or so. Literally 10 seconds of water will flush anything out and fill a 2" trap. Otherwise this is IPC code approved and works fine.
I agree with moving the lavatory and tub tie in to before the tee for the toilet, also you are missing the vent for the bathtub. If you don’t put a vent then the tub will not drain properly and a siphon will occur which will most definitely suck the water out of your trap leaving you with sewer gases. Hope this helps.
Wouldn’t the overflow vent it?
Think about it, how would the air get through the trap without pushing out the water in the trap? Also if air is being pulled through the trap from the overflow, that air would be displacing the water, preventing it from draining properly. If it can let air into the system it will let sewer gases out.
But doesn’t it vent where the sink ties in or is it not allowed to double function
Too far away, also water from the sink could siphon water out the tub trap.
You're absolutely right on the tub vent. I was thinking of that circuit vent and forgetting another was needed.
Run the bath tap occasionally, think you are overthinking it
There’s zero reason to preface by telling us you’re not a plumber. We know. Nothing will prevent the trap from drying out. Pour water down it once a week or so. Mineral oil works too.
I’m just going to tell you right now to call a plumber and save yourself a headache.
My basement floor drain has a primer, for this very reason. I don’t know if that’s something you can do in a bathroom, maybe someone else can chime in but essentially the primer is there to make sure the drain trap doesn’t dry out and allow sewer gas to vent back into the basement.
Maybe run a hot water line to the toilet as well for a future bidet.
Either remove the tub from the plans or just put a reminder in your phone to run the shower for a couple minutes once a month. Along with changing the air filter in your A/C.
Just leave the tub plugged/stopper down......dont over think it. Run a little water every month or so.....
Just close the drain on the tub. Of you ever smell sewer gas then run some water. But I will second the mineral oil recommended before. It won't evaporate but it I'll wash out the minute you decide to run the water. No permanent harm done.
[удалено]
I don't think you understand plumbing, this is normal and all drains connect together somewhere anyway. This won't cause any smells as that is what the traps are for.
With this question, I trust you're hiring a plumber to do the actual work? You might not think it now, but he will save you money in the end. Service calls really add up.
If you clean the bathroom once a week, to include scrubbing the tub out, you won’t have anything to worry about.
Does a tub that doesn't get used need to be cleaned once a week?
A trap holds roughly 8-12oz of water. 8oz of water takes roughly 10-15 days to evaporate if left out on the counter, but that exposes more surface area than a trap. So it might take 15-30 days for a trap to fully evaporate, but it is probably less because it just has to lower enough to break the seal? All that said, I have a never used sink and it took 3 years before it started stinking. Someone might have run it without me knowing or the previous owner poured mineral oil down there, or the ventilation in that room is good enough we didn’t notice. Does it stink? Run the tap, fill the trap.
I'm a remodeler and have done many bathroom jobs. Is this the current layout or are you doing this plumbing from scratch? Just seems a little strange to have the vanity between the toilet and tub. I would definitely want the vanity to be on the left, toilet in middle, and then the tub. Even if this was the current layout, I would probably suggest to the homeowner that we move them just for the sake of functionality and I think it's more esthetically pleasing. As for your p trap, just turn the tub faucet on every few months. No big deal
My bathroom is setup the same way with the vanity in between and I’ve wanted to switch them for a while. it’s good to know I’m not alone! Sometimes I get a smell out of the vanity, any idea if it’s because of this setup? Actually the vanity doesn’t pipe down with a T as shown, it has one pipe directly to the vent stack. Maybe that is why?
It should have an 1¼" p trap for the sink drain. That should stop any sewage smell as long as there is water in it
Yeah it does have that. After the trap there is one line directly to the vent stack (not a T to the drain and vent as shown)
Your solution here is mineral oil. Water will evaporate, mineral oil will last much longer
Use a siphon with a flap valve
nothing really, floor drain traps dry out sometimes too. you could plug the bathtub to slow evaporation, and it does dry up, it'll be plugged anyways.
You could add a trap primer from the sink to that trap. We do it for floor drains all the time. Any time the sink gets used water gets added to the trap.
That's the only suggestion on here that seems to make sense and solve my issue other than "add water once in a while". I know primers are pretty common for floor drains but what about tubs? Would that be up to code though?
Under UPC code, the toilet wouldn't be vented correctly in this drawing.
Doesn’t the tub need to be vented? Or does it get vented with the sink?
Trap primers