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Old 10-27-2016, 04:33 PM   #1
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Shower Pan voids


My contractor has installed a fiberglass (?) pan over cement for my shower replacement. The walls are engineered stone sitting on the Pan. The pan has a void under it. I can feel in "sink" slightly when I walk on it. The contractor says its normal for pre-formed pans to have voids. I have one in my other bathroom that has no voids and is solidly laying on the underlying cement.
Are voids acceptable or will they limit the life of the pan? Any ideas as to a fix?
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Old 10-27-2016, 05:33 PM   #2
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Re: Shower Pan voids


It would help if you give us the brand and specific model of the shower base. We also need to know if this is over a suspended wood subfloor or on a slab. Is there a hole in the subfloor under the area that deflects? Your location might also help for other questions we may have later. Many (if not all) manufacturers recommend a supporting bed of fresh cement or plaster under these plastic shower bases. I'd want a solid base, they do crack as you suspect.

I have a suspicion your contractor is lazy and is cutting corners cuz you can't see under it once done and he's seen other hacks do the same thing. Oops, did I say that?

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Old 10-27-2016, 05:40 PM   #3
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Re: Shower Pan voids


No way are voids acceptable!!!
Engineered stone on the walls would be one of the last choices I would have made.
How do you plan on cleaning them?
Got some pictures?
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Old 10-27-2016, 08:06 PM   #4
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Re: Shower Pan voids


Not sure of the Manufacturer or Brand. I have the identical pan installed in my other bathroom (about 2 years ago). They poured cement under it and set the pan into it- its solid to walk on. I'm in Phoenix.
>> Not sure how to insert an image<<
After waterproof concrete wallboard (??) is put on the wall "Redguard" is applied and the engineering stone (slabs) are attached. They rest on the pan which is why I don't think the contractor wants to try and correct the situation- too much time and money. The cleaning is easy with "simple green".
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Old 10-27-2016, 09:27 PM   #5
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Re: Shower Pan voids




Think I found how to put in an image.
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Old 10-27-2016, 11:42 PM   #6
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Re: Shower Pan voids


I'll try the image thing again...
The picture is an attachment...I hope
Attached Thumbnails
Shower Pan voids-shower-void-area-01.jpg  
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Old 10-30-2016, 08:33 AM   #7
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Re: Shower Pan voids


They should have poured a layer of wet mortar or Structolite and "smushed" the pan down into that wet layer. The wet material fills all of the voids under the pan and stops any problems with flexing.

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Old 10-31-2016, 11:32 AM   #8
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Re: Shower Pan voids


Thanks, I'm sure they didn't pay enough attention to setting the pan.
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