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Old 07-20-2013, 04:12 AM   #1
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Caulking when installing a toilet


I'm installing a toilet. I thought that I'd apply caulk to the bottom of the toilet (the outer edge, not the inner part that inserts into the waste pipe) before I placed it on the flange in order to proactively deal with the inevitable toilet/sink/bathtub flood. Is this a good or bad idea?

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Old 07-20-2013, 06:18 AM   #2
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Caulking when installing a toilet


Sounds like a mess is about to happen.

If you wish to caulk the base of the toilet--do so after the unit is installed and tested--I can not imagine how you could add caulk to the toilet before installing without having it all over the floor.

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Old 07-20-2013, 06:46 AM   #3
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Caulking when installing a toilet


I would not use caulking anywhere for a toilet install.
I hate that when I show up and find caulking around the base of it especially.
Just going to form a pond to hold the water in under the toilet.
If that wax ring is leaking I want to know all about it, not let the water sit long enough to rot out the subflooring.
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Old 07-20-2013, 08:28 AM   #4
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Caulking when installing a toilet


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Originally Posted by joecaption View Post
I would not use caulking anywhere for a toilet install.
I hate that when I show up and find caulking around the base of it especially.
Just going to form a pond to hold the water in under the toilet.
If that wax ring is leaking I want to know all about it, not let the water sit long enough to rot out the subflooring.
It is not a good idea. As Joe says it will trap the water and cause damage. I caulked around the base of my toilet long ago and did not notice the seal was leaking until I saw the linoleum around the toilet was gradually darkening. It makes pulling the toilet out to change the leaking seal that much harder also.
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Old 07-20-2013, 10:34 AM   #5
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Caulking when installing a toilet


Per UPC it is required to caulk fixtures to the mounting service. I have failed inspections for not caulking.
It keeps stuff from getting under the fixture edge where you can't clean.
If the flange is installed properly- as in not below the floor level and anchored, You should not have a sealing issue.
But don't caulk before setting the toilet- caulk after. I use Dap Kwick seal
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Old 07-20-2013, 12:23 PM   #6
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Caulking when installing a toilet


Considering how good my boys aim is.....I caulk.....but this is how I do it....

With the tank off....I flip it upside down.

I run a 1/4" bead of silicone based caulk all the way around as close to the edge as possible....but on the bottom flat.......I leave about a 1/2" gap in the back. If I have an issue, water will come out there.

I let is sit like this for at least and hour....I want the outside of the caulk to be non-tacky...but the inside still real soft...

Install proper size wax ring...

Carefully flip over and set down....the bolts and wax ring help you get it properly centered.

One good push and it sets the wax ring and the caulk is now compressed....if you waited the right amount of time....you get just a little bit of caulk out the side.

Using the finger....clean up the caulk oozzzz........

Tighten bolts....hook up the rest....done.
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Old 07-20-2013, 03:00 PM   #7
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Caulking when installing a toilet


Per IPC the other 36 states it is required to be caulked to keep urine out. I would caulk it after you have it fully installed. If it is a new install I would use the fernco no wax. That will never leak.

http://www.fernco.com/plumbing/wax-free-toilet-seal

Just buy the right size for your drain pipe.

Do not use this on any old toilet that had wax on it before.

Last edited by Ghostmaker; 07-20-2013 at 03:03 PM.
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Old 07-21-2013, 09:22 AM   #8
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Caulking when installing a toilet


I've never caulked a toilet in my life. Or even seen one that I could tell had been caulked. I can't imagine it's a code requirement - I passed my plumbing inspection without doing it.
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Old 07-21-2013, 09:27 AM   #9
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Caulking when installing a toilet


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I've never caulked a toilet in my life. Or even seen one that I could tell had been caulked. I can't imagine it's a code requirement - I passed my plumbing inspection without doing it.
There has been a recent change in the codes---Caulking is required in many areas now---I do not like to caulk a toilet to the floor---but 'the powers that be' have commanded it---
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Old 07-21-2013, 05:41 PM   #10
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Caulking when installing a toilet


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I've never caulked a toilet in my life. Or even seen one that I could tell had been caulked. I can't imagine it's a code requirement - I passed my plumbing inspection without doing it.

Bring it up to northern Ohio We can discuss the matter... LOL

I'm a plumbing inspector with 28 years in the trade....
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Old 07-21-2013, 07:25 PM   #11
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Caulking when installing a toilet


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Bring it up to northern Ohio We can discuss the matter... LOL

I'm a plumbing inspector with 28 years in the trade....
Well, then I certainly defer to your expert knowledge and experience. I'm merely a retired electrical engineer. All I know is that in 40 years of owning homes (total of ten) I've never seen a toilet caulked.
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Old 07-21-2013, 07:40 PM   #12
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Caulking when installing a toilet


Quote:
Originally Posted by joecaption View Post
I would not use caulking anywhere for a toilet install.
I hate that when I show up and find caulking around the base of it especially.
Just going to form a pond to hold the water in under the toilet.
If that wax ring is leaking I want to know all about it, not let the water sit long enough to rot out the subflooring.
it sounds right but...according to most if not all plumbing codes.....need to caulk to past code ... and yes do it after commode is set...ben sr
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Old 07-21-2013, 07:51 PM   #13
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Caulking when installing a toilet


Quote:
Originally Posted by ddawg16 View Post
Considering how good my boys aim is.....I caulk.....but this is how I do it....

With the tank off....I flip it upside down.

I run a 1/4" bead of silicone based caulk all the way around as close to the edge as possible....but on the bottom flat.......I leave about a 1/2" gap in the back. If I have an issue, water will come out there.

.
Yea Dawg.... I have the same issue as you... but since my son moved to Cali, I now have to blame it on the dog........(EDIT: Come to think of it, you already have a similar name)

I do the same as Dawg and always leave that 1 inch gap in back in case there was leakage.

I always caulk after seting, shimming, leveling the toilet.

I think the caulk..

1) helps support/cushion the toilet and

2) Yes, while you can have a leak at the wax ring, overflowing toilets seem like a very likely problem also... and the caulk prevents that from getting to your subfloor and not being able to dry out..
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Last edited by MTN REMODEL LLC; 07-21-2013 at 07:56 PM.
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Old 07-21-2013, 07:58 PM   #14
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Caulking when installing a toilet


my son is 35 and married and owns his own house with his own dogs....so guess who pees on the side of my commode....ben sr this is casey he is 13 and a diabetic for the last 6yrs...
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Old 07-21-2013, 08:23 PM   #15
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Caulking when installing a toilet


Ben- consider a urinal- I know it's not the dogs fault

But think about it. If all parts of the plumbing system is installed correctly. It shouldn't leak.

This includes: using only 1 standard bowl wax- not jumbos or stacked waxes- which are against UPC code

Setting the flange on top of the floor- which is also UPC code.

And of course anchoring the flange to the floor- also code.

I wonder if some people don't caulk because they don't trust their own work or materials

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