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imautoparts 11-04-2012 10:02 AM

How much should a FG shower pan flex?
Hi all,

I'm in the middle of a small tile job - the bottom row of tiles in my master shower had cracked free from the next row up due to the shower pan flexing about 1/16" and pulling the tiles down with it. The damage was confined to one corner of the shower.

I've now redone the water-resistant wallboard behind the leak (it had deteriorated) and am planning to secure the tile to the wallboard area but not grout behind the part of the tile that overhangs the edge of fiberglass shower pan, thus allowing the pan to flex without cracking the tiles loose again.

I'm a big guy - nearly 300 lbs. Should I be worried about this pan flex?

Note: the shower in question is on the second floor so it is not mounted to a slab of any kind - just floor joists.

oh'mike 11-04-2012 10:50 AM

Properly installed with a bed of mortar under the pan---no flexing what so ever----

Poor install----builders special?

imautoparts 11-04-2012 11:18 AM

Builder's special indeed - as in my Father was a professional homebuilder and built this house in 1968 for himself. So the pan should be on a bed of mortar? I'll feel around back there and see if I can verify....

OK - just went and felt around, but my access is not good and I couldn't reach completely underneath. I felt around with a wire and it feels solid down there.

When I put pressure on the pan the only flex I can feel is in this one corner... it is slight, but noticeable. No other part of the pan flexes. Only the pan flexes, the wall studs that hold the shower walls in place do not move at all - The only thing that seems to be shifting is the corner of the pan where the problem occurred.

I'm wondering if this void was there from the beginning and only now is becoming noticeable due to the increased wear and tear from heavier people using it.

Perhaps I should open the wall further and squeeze in some structural grout/adhesive, or shim or otherwise reinforce this area? Thoughts? Suggestions?

I don't want to over-think this.

joecaption 11-04-2012 11:41 AM

And what did you replace the old incorrectly used drywall with?
Good luck trying to now get something under the pan to support it, I"ve never seen it work out.

oh'mike 11-05-2012 05:05 AM

1968? It served it's purpose well---and may have outlived its useful life----44 years---not bad

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