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Posted by Norminn on October 31, 2005, 7:52 am
Al wrote:
> I am having my shower torn out and completely rebuilt.
>
> The trademan who is doing this has installed a PVC liner 7 inches up
> the sides of the shower from the and over the curb.
>
> However, when he installed backer board over the PVC liner, he
> installed screws into the backer board that were between 1.75 and 2.00
> inches above the bottom of the liner where it rests against a sloped
> subfloor, piercing the PVC liner at that point behind the backer board.
>
>
> He intends to lay down a layer of mortar on top of the PVC liner to
> create a sloped surface to lay the floor tile on. Thus, the height of
> the screw holes (and the punctures in the PVC membrane) will be even
> closer to the finished shower floor after the file is installed.
This link has details of shower installation, and suggests your concerns
are right:
http://www.thetiledoctor.com/howto/showers.cfm
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>membrane lying on the subfloor, but on top of the PVC liner a sloping
>mortar bed will be added as one cannot place tile directly over the PVC
>liner.
>This means that after the tile on the shower floor is installed, the
>screw holes will be much closer to the bottom of the shower floor than
>the 1-3/4" to 2" that I listed in my original email.
>Sorry for posting my inquiry so often. I had posted it and deleted it
>several times - each time revising it a little.
>Thanks.