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Old 08-07-2016, 09:44 AM   #1
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Class C shower surround to tub caulking

Hi all, I tried to search on this but could not find any clear direction.
I am trying to decide whether or not to caulk the shower surround walls to the tub where they overlap.

From what I have been able to gather so far there seems to be two schools of thought on this:
1 - Caulk the gap to seal everything together,
2 - Leave it un-caulked, the surround is actually inside the tub's perimeter, and this will allow air to circulate.

I would like to know what others have done.

Thanks
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Old 08-07-2016, 09:56 AM   #2
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When I installed a new tub and surround in the s&b several years ago the instructions said not to caulk that joint. If any condensation gets back there it can run down the back of the surround and get into the tub instead of building up behind it.
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Old 08-07-2016, 10:04 AM   #3
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Don't calk. Everything in the MH flexs so it will create other problems as well as the ventilation issue.
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Old 08-08-2016, 06:31 AM   #4
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Thanks guys, the feedback is appreciated.
So far I am also leaning in the "no caulk" direction, I don't want to trap moisture and cause a mold issue or other problem from dampness. Since I have already removed the caulking I will remove the access panels, run the shower against the walls and see if I get any spillover areas.
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Old 08-29-2016, 09:28 AM   #5
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So if not caulked, where does the water go?
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Old 08-30-2016, 08:48 AM   #6
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So if not caulked, where does the water go?
Down the drain. The walls overlap the shower pan (floor) so water running down the walls continues down the side of the pan to the floor and on to the drain. You might be surprised how many places rely on gravity to control water.
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Old 08-30-2016, 09:06 AM   #7
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What about around the top where the shower walls meet The ceiling ?
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Old 08-31-2016, 08:53 AM   #8
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What about around the top where the shower walls meet The ceiling ?
Why are you spraying the ceiling? ;-)

If the fit is tight, as it should be, and the user is sensible, that should not be an issue. If not do what you need to. The point was to leave the bottom joint free to drain.
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Old 08-31-2016, 09:05 AM   #9
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Something to consider - anything that restricts that surround's ability to expand and contract is a definite no-no. Just like vinyl siding on a house, that thing moves with temp changes much more than people might imagine. Caulking is not likely going to hold long on either end.
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Old 09-01-2016, 11:49 PM   #10
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I'm replacing the ceiling and skylight as part of a re-roofing job. I'm putting back a fan instead of skylight but also replacing the ceiling.... Original was caulked....
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Old 09-14-2016, 04:50 PM   #11
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Soooo...... If I am replacing the ceiling, frame, wood, luan, etc... When I'm done, what caulk would you recommend I use for the top of the shower to the ceiling joint?
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Old 09-21-2016, 03:40 PM   #12
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After removing the silicone sealant from the tub to shower surround wall gap I tested the shower/tub in my B+ for water tightness. It leaks out of the tub at the bottom corner where the shower door side and bottom frame channels meet the top tub surface and the shower surround wall.

It seems that the water is traveling along the top of the tub, going behind the wall and coming out onto the bathroom floor, and behind the wall.

I was able to get a look behind the wall and there is no sealant between the back of the shower surround wall, the tub, and the shower door channel. To make things a bit harder to address is that the end of the tub section that goes up behind the surround tapers down to the tub surface behind the shower door channel.

Still with me?

Anyway, I think the only way to seal this is to drill a hole through the shower surround wall close to the vertical shower door channel, but not through the tub behind it, and inject some self leveling silicone window sealant through the hole and then seal the vertical door track to tub surround.

Does anyone have any thought on whether this plan will work? Experience with this dilemma and a solution to your own similar situation?

Thanks in advance and happy/safe camping.
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Old 09-27-2016, 03:27 PM   #13
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bump
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Old 10-07-2016, 05:59 PM   #14
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would it be too hard to remove that vertical and lower shower door slide channel and sealing that whole vertical shower wall and tub edge?
then sealing the track channel on the shower side so water doesn't get behind it
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