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Old 01-14-2018, 07:35 PM   #1
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OK to caulk around toilet to stop cold air?


We have a 1930-built house. There's a small but noticeable amount of cold air flowing out of a thin gap between the base of the toilet and the porcelain tile in the bathroom right above our garage. I can see the toilet drain pipe going up through the garage ceiling (I think it's cast iron), and I've put insulating foam around the penetration. I can't get inside the joist bay it goes through to air seal any gaps, but I know it's filled with blown in cellulose. Is it OK to caulk (latex?) around the base of the toilet to reduce the air flow? I would leave at least a 1" gap at the back so that a leak would be apparent. Thanks.
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Old 01-14-2018, 07:46 PM   #2
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Re: OK to caulk around toilet to stop cold air?


That would be fine.
But far better to air seal from below.
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Old 01-14-2018, 07:47 PM   #3
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Re: OK to caulk around toilet to stop cold air?


Sure, you can caulk it. No gap needed.
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Old 01-14-2018, 07:47 PM   #4
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Re: OK to caulk around toilet to stop cold air?


Yes its fine to caulk it. Many would use a mold resistant silicone there. And you might give the toilet a firm shake before you caulk it... no sense caulking it if your toilet moves at all. If it moves, you should fix that first.
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Old 01-14-2018, 07:52 PM   #5
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Re: OK to caulk around toilet to stop cold air?


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Originally Posted by XSleeper View Post
Yes its fine to caulk it. Many would use a mold resistant silicone there. And you might give the toilet a firm shake before you caulk it... no sense caulking it if your toilet moves at all. If it moves, you should fix that first.
Thanks. I just gave it a good shake -- rock solid. OK on using a mold resistant silicone caulk.
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Old 01-14-2018, 07:54 PM   #6
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Re: OK to caulk around toilet to stop cold air?


Any leaks would most likely show up in the garage ceiling. As for stuffing insulation to block air, air filters are made of fiberglass.

The bad news is that the ceiling of the garage is no longer accessible and the house to foundation rim was not sealed. That cold air you feel is leaking in and up through the many holes that normal construction creates. Energy costs would have to quadrupedal to justify removing the perimeter 2' of ceiling drywall and sealing the rim as it should be, but maybe the next house .

My choice would be 100% silicone as it would clean easier than regular latex caulk.

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Old 01-15-2018, 05:12 AM   #7
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Re: OK to caulk around toilet to stop cold air?


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Sure, you can caulk it. No gap needed.
I agree with Ray that a gap in the back should be allowed. You don't want water gathering up in the area and rotting the wood below. Having a gap can alert you to a potential leak far ahead of the toilet falling through the rotted floor that you sealed off.
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