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Unread 09-10-2019, 06:24 AM   #1
Emil Volk
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JUNCTION TUB and SHOWER TILE

The question arises as to how to deal with the junction of the vertical tile and horizontal tub: should grout be used and then seal the grout or should 100% silicon caulk be used. the vertical plane of the tile projects over the bath by 1/2".
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Unread 09-10-2019, 06:39 AM   #2
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Not an expert, but I believe you should use caulk, rather than grout, at the tub to tile joint. Dissimilar materials expand and contract differently, so a grout joint will likely fail while a caulk joint will move with the materials.

That being said. I would NEVER use silicone caulk there. If it does ever fail (likely after a few years), you have to remove every speck of it before applying new caulk. That is not an easy task.

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Unread 09-10-2019, 06:57 AM   #3
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yes; it is difficult to remove silicone caulk. I am not sure of the best way of doing that. Perhaps a strong organic solvent like acetone would help remove it if the need arose to do so. I am thinking that silicone caulk when cured is completely insoluble in water and will be resilient in the junction.


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Unread 09-10-2019, 06:58 AM   #4
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Definitely not grout for that application.

Standards call for a flexible sealant there. The acrylic latex caulks don't usually hold up in a shower, so I don't recommend those.

There are some better quality caulks that aren't 100% silicone that may work well for that.

We mostly recommend 100% silicone because of its durability. While it is a bit difficult to remove, that shouldn't happen for several years, so it's not like you'll be inconvenienced very often. Mineral spirits usually helps after the majority of the bead is removed.
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Unread 09-10-2019, 07:21 AM   #5
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One thin I can tell you is that mineral spirits can help remove 100% silicone caulk but, in general, it would be better if a proportion acetone say 10% to start with were mixed with the mineral spirit. This will strengthen the solvent and make it more effective in dissolving the silicone.

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Unread 09-10-2019, 07:58 AM   #6
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Possibly the flexible sealant is appropriate in the case of new construction, but after a house has been there for 40 years it has settled down and there is less movement.
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Unread 09-10-2019, 08:01 AM   #7
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While there may be less movement, there is still movement. homes are built with wood, which expands and contracts.
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Unread 09-10-2019, 08:11 AM   #8
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And when you fill that tub with water, and a body, it's also going to move.
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