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04-25-2012, 04:16 PM
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#1
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Member
Join Date: Dec 2006
Posts: 570
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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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04-25-2012, 10:57 PM
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#2
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Member
Join Date: Nov 2011
Location: Hartfield VA
Posts: 18,253
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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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04-26-2012, 07:46 AM
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#3
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Member
Join Date: Dec 2008
Location: Wilmington, DE
Posts: 3,097
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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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04-26-2012, 02:28 PM
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#4
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Member
Join Date: Aug 2010
Posts: 731
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bottom of tub & shower flexes
Quote:
Originally Posted by Just Bill
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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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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04-26-2012, 09:56 PM
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#5
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Member
Join Date: Oct 2011
Location: pa
Posts: 3,197
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bottom of tub & shower flexes
Quote:
Originally Posted by darsunt
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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not suppose to move or flex.....sounds like damaged unit.....or maybe a bad install... 
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04-26-2012, 10:48 PM
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#6
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Persona Non Grata
Join Date: Aug 2010
Location: Vancouver Island, BC
Posts: 1,418
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bottom of tub & shower flexes
Quote:
Originally Posted by Homerepairguy
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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Fill the tub with water.
Last edited by VIPlumber; 04-26-2012 at 11:08 PM.
Reason: Stoopid sounding sentence.
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04-27-2012, 04:07 PM
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#7
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Member
Join Date: Mar 2012
Location: Massachusetts
Posts: 214
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bottom of tub & shower flexes
Quote:
Originally Posted by Homerepairguy
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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There are also low expansion foams available.
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