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Old 04-25-2012, 04:16 PM   #1
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bottom of tub & shower flexes


The bottom of both our shower tub and shower flex a bit in spots when we walk on them. The shower is a one piece surround, and the tub is fiberglass, I believe.
Is this common? Are the bottoms thin fiberglass laid over studs? We recently bought this condo, I've never experienced a tub or shower where the bottom flexes like this.

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Old 04-25-2012, 10:57 PM   #2
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bottom of tub & shower flexes


Not suppost to move at all, at some point it's going to start cracking.

There made two differant ways, self supporting and set in a bed of morter.

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Old 04-26-2012, 07:46 AM   #3
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bottom of tub & shower flexes


What he said, fiberglass tubs/shower either require support during installation or they are built in such a way that they don't. Yours does need additional support, but did not get it when it was installed. If there is access to underneath, even if you have to open some drywall, expanding urethane foam will usually give adequate support. Fill the cavities between the subfloor and tub floor.
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Old 04-26-2012, 02:28 PM   #4
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bottom of tub & shower flexes


Quote:
Originally Posted by Just Bill View Post
What he said, fiberglass tubs/shower either require support during installation or they are built in such a way that they don't. Yours does need additional support, but did not get it when it was installed. If there is access to underneath, even if you have to open some drywall, expanding urethane foam will usually give adequate support. Fill the cavities between the subfloor and tub floor.
When applying the expanding urethane foam, is there any chance of the tub/shower floor bulging up due to foam pressure? Are there any precautions to take when doing the job?

Thanks,
HRG
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Old 04-26-2012, 09:56 PM   #5
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bottom of tub & shower flexes


Quote:
Originally Posted by darsunt View Post
The bottom of both our shower tub and shower flex a bit in spots when we walk on them. The shower is a one piece surround, and the tub is fiberglass, I believe.
Is this common? Are the bottoms thin fiberglass laid over studs? We recently bought this condo, I've never experienced a tub or shower where the bottom flexes like this.
not suppose to move or flex.....sounds like damaged unit.....or maybe a bad install...
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Old 04-26-2012, 10:48 PM   #6
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bottom of tub & shower flexes


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Originally Posted by Homerepairguy View Post
When applying the expanding urethane foam, is there any chance of the tub/shower floor bulging up due to foam pressure? Are there any precautions to take when doing the job?

Thanks,
HRG
Fill the tub with water.

Last edited by VIPlumber; 04-26-2012 at 11:08 PM. Reason: Stoopid sounding sentence.
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Old 04-27-2012, 04:07 PM   #7
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bottom of tub & shower flexes


Quote:
Originally Posted by Homerepairguy View Post
When applying the expanding urethane foam, is there any chance of the tub/shower floor bulging up due to foam pressure? Are there any precautions to take when doing the job?

Thanks,
HRG
There are also low expansion foams available.

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