I opened up my email today and found yet another shower system available for sale. When will these companies stop making foam showers?
If you have not heard the sound tile makes when set over foam it's awful. Sounds hollow. Sounds weird.
I have never installed a shower with a foam base and most likely never will. This includes all the bases from Schluter, Noble Company, Laticrete and now sadly from Durock.
Tile should be set in stone. Not on foam.
More info on this crappy new system can be found here: http://www.cgcinc.com/content/usgcom...er-system.html When I say crappy I say this with no first hand experience - the fact that the product uses foam is enough info for me.
CGC Shower Video - Notes on the Video
It starts out asking for a level substrate. The video goes on to recommend un-modifed thin-set and a Durock membrane which looks like it was made by Wedi. I love how the backer board is not screwed off right in the video...
The video shows pipe seals and thermastatic control valve seals like the Schluter ones. I wonder if Schluter is making this membrane for Durock???
Un-Modified thin-set to the plywood subfloor - are you F___king kidding me. Do these people have no clue? Wow, such horrible advice in this video. BUt hey Jim they said it so it must be true. I have heard stories from my suppliers of kerdi showers coming un-bonded when un-modifed thin-set was used to set the foam base. Here I would use a self curing thin-set like Grani Rapid from Mapei for this step...... But what do I know, I only build showers for a living...
No reinforcing around the drain cut out - they might be worried about point loads hey Jim! LOL I was kidding folks. All shower drains should be supported for added strength. It's not hard to slide in a couple 2"x4" 's from the top side and screw them in place. The video never showed the installer checking the subfloor. Checking for expansion. Didn't mention about keeping the tongue an groove clean when doing the shower base install. These companies need some serious training. It's almost like the marketing people make the video - WEIRD.....
Wow - looks like Schluter is making this membrane for Durock. Who wants to bet that the Durock IAPMO is listed under Schluter's number?
Hoping non-modified thin-set will bond the the drain base! Aaahh not. Here again I would scratch up the bottom of the drain base a bit with my pocket knife and then use Grani Rapid for this step. I would fear the drain base un-bonds as the thin-set cures and this is a huge weak point in the shower's design. Easy fixes. with only an O-Ring for water tightness I would hope all flood test use an inflatable test plug pushed in down past this connection point.
Looks like the curb is massive and has no slope to it! Wow - must be a Kerdi Board Niche Engineer who designed this flaw.
At least they recommend a flood test. But they show the wrong test plug. The one in the video will not check that O-Ring connection point to the drain.
The floor tile should go in first and then the wall tile - the video has this ass backwards.
The drain top should not be flush with the tile - it should be slightly recessed. OMG is that a lot of thin-set at the drain connection. Imagine how nasty that looks in three months. And the thin-set is non-modified - I would guess that the shower's grout looks grey in six months time.
No expansion between the floor and the curb prep = Mistake.
This shower system is a good lesson on why companies should not branch out from what they do best. Crappy design. Crappy install video. Crappy Shower.