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Old 12-08-2018, 09:24 AM   #1
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Joint between tile and tub - grouted?


I had a contractor install new tile around our soaking tub this week. They grouted the joint between the bottom of the tile and the top of the tub. Is the grout sufficient to make this joint waterproof? Or is caulk needed? Thanks!
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Old 12-08-2018, 10:15 AM   #2
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Re: Joint between tile and tub - grouted?


Anyplace the tile changes direction or comes in contact with a different material it should be caulked with silicone caulking.
What they have done is going to crack in no time.
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Old 12-08-2018, 10:24 AM   #3
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Re: Joint between tile and tub - grouted?


Thank you for the info. Does that mean I should caulk over the grout? Or does the grout need to be removed and replaced with caulk?
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Old 01-03-2019, 09:27 AM   #4
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Re: Joint between tile and tub - grouted?


It would be better to remove the grout and use caulk, with a very slight lap on the edge of the tile.
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Old 01-03-2019, 10:02 AM   #5
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Re: Joint between tile and tub - grouted?


Are you sure it's grout and not sanded caulk? When I tile I use a sanded caulk that matches the grout color so my caulked seams don't stand out.
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Old 01-03-2019, 10:07 AM   #6
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Re: Joint between tile and tub - grouted?


Also keep in mind that no matter where it's used, grout is not waterproof. The reason for caulk in this location is because it can handle the movement this joint will see better than grout can tolerate.
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Old 01-05-2019, 12:11 AM   #7
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Re: Joint between tile and tub - grouted?


I've seen time and time again "pros" using grout between tile and tub, only to find out that as little as 1-2 weeks later the joint develops hairline cracks. It goes downhill from there.


Sanded matching color caulk looks great, but every back label I had read states it is not well suited for applications with either pooling or standing water. That's because these caulks have either latex or acrylic bases.


Silicone is a better option, but it does tend to shrink with time.


The best option is to use Marine Adhesive/Sealer. It is designed for below waterline applications and doesn't shrink. Yet, provides flexible joint. Just make sure to fill tub with water to overflow opening before application, and drain only once the sealer has hardened. This will ensure it's at a slight compression, as opposed to a tension.
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