Welcome, PJ.

The installers have said repeatedly they are using cement & it is stronger & when I ask about corners/gaps in edges they say not to worry they are using cement & will fill with cement.Good bit I don't understand in your descriptions.
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Originally Posted by PJ
I don't believe a 40 mil liner was used, a lesser plastic sheet may have been used they said. I purchased the other new when they ask about the old liner & so installed the new over the old behind Durarock.
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There are essentially two primary methods of constructing a tiled shower receptor. One is the traditional method, using a sloped mortar bed, a 40mil PVC or CPE liner, and a second mortar bed to which tile is bonded. The other is the use of a single sloped mortar bed (or foam piece these days) and a direct bonded waterproofing liner to which the tile is bonded.
In remodel work, where a curbless shower is desired, the traditional method is seldom a suitable choice. From your description, however, I can't tell just what you might have. It could be a perfectly good installation, or something all together unacceptable. Photos would certainly help here. Not sure why you would not be able to attach photos from storage on your computer using the paper-clip icon above the Reply dialog box, if that's what you tried to do.
Quote:
Originally Posted by PJ
The installers have said repeatedly they are using cement & it is stronger & when I ask about corners/gaps in edges they say not to worry they are using cement & will fill with cement.
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If you are talking about use of grout in the tile surface, that is incorrect. The ceramic tile industry requires the use of a flexible sealant in tile joints any place the backing material makes a change of plane. If you're talking about something else, disregard my comment.
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Originally Posted by PJ
They said they don't need the tape with the cement & larger format tiles...
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If you are talking about the joints in the CBU panels, that is completely incorrect. If you're talking about something else, disregard again.
I think it was wise for you to stop the construction if you're unclear about the process and the contractor can't answer your questions. But for now, I'll need to wait for some clarity about exactly what is being done and photos would go a long way toward that end.
My opinion; worth price charged.