Kerdi vs Provamat drain?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by exeunt, Jul 7, 2010.

  1. exeunt

    exeunt New Member

    Apr 29, 2010
    Stouffville, Ontario, Canada
    Someone on **** was selling off their remaining Kerdi equipment so I grabbed some. He claims that they as a reseller have switched to ProvaMat due to lots of Kerdi failures recently. He claimed that many plumbers were making the switch. Any truth to this? I've got Kerdi and the tray now, should I be looking elsewhere for the drain?

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I've not heard of any failures with the Kerdi stuff. My guess, and it is only that, is that they've chosen to switch to a less expensive source. No experience with ProVaMat. Note, properly installed, a Kerdi install does NOT have weep holes, since the surface membrane is sealed to the moisture ever gets beneath it. A system that claims to be a surface membrane that requires weep holes is looking at belt and suspenders...they expect their drain to leak. All of the Kerdi drain covers are square in all available finishes. As with anything, you must follow the manufacturer's installation instructions...installed properly the Schluter system works great.

    Note, if installed properly, moisture typically wicks at most 1/4". Since there's supposed to be at least a 2" overlap, moisture never even gets close to leaking beneath the membrane far enough to do anything. I was at a class where they put Kerdi on a cardboard box using thinset. It was in use for months. Filled with ice and drinks in the morning. The box never got wet. It got floppy because of all of the flexing, but the kerdi never leaked nor did the box get wet after months of use. The stuff works and they have a long track record.
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  4. Tileyourshower

    Tileyourshower New Member

    Feb 5, 2014
    ProVa Mat. Not Fully understood...

    Since this question is directly in response to what I said to a customer I will assume I have the right to....respond.

    As the poster stated here: "A kerdi install does not have weep holes" he is correct, what he does not understand is that the ProVa Mat system is designed similar to the kerdi, the membrane is adhered to the drain body just as the kerdi adheres to its drain body.
    The ProVa Drain is not designed to leak
    Lets also clarify.... the weep holes are in the drain cover insert threads..... so this tell us they are in the flow point, it will not leak nor is designed to leak.
    I have been in this trade for almost 30 yrs and I am suprised at the way people offer advice based on a item they have never used, nor attempted to use.
    This reply is long overdue but I felt when one is offering false facts about a unit they do not understand, then a rebuttal is required.
    Thank you.
  5. Tileyourshower

    Tileyourshower New Member

    Feb 5, 2014
    I will say you have formed an opinion based on a factless observation.
    I have been in this trade for 30 yrs and my father before me was, it I count the time since I was used a child in advertising for his business I will say 40 years...
    It is clear you have never used this drain and it seems you are the problem with mis information on this site.
    There is nothing Cheap about the prova drain design, we sell thousand of them and to date have not had one returned or one fail.
    I will not stoop to your level to tell you the surmised flaws of what you like to use.
    The arrogance you exude defines you closed mind. We all as professionals do the research and development to find the best solution for our customers, when somebody like you assumes an issue without understanding the application nor has even used the item you belittle your own claimed expertise level.

    The aspects to ProVa to the Kerdi are vastly different, the Kerdi drain will not weep and it has a weight limitation and your height adjustment is limited and the drain floats in the body only attached by the lateral ring, witha subgrade unmodified thinset
    T he ProVa drain body is not "lumpy" as you have so radically mistated The ProVa drain unit screws into the body that integrates into the tray, this in turn give one greater control of the hieght sdjust and provides four weeping slots build into the threads.
    The ProVa drain is in all way superior to the Kerdi drain.

    I have pictures of the infamous kerdi drain 6 months after install and the water that has turned to mildew around the based of the adjustment collar, that cannot weep....

    The ProVa Drain was designed in Canada, since you are Canadian, you should show an innovative company from your own country the respect it is due.
    Last edited: Feb 11, 2014
  6. themp

    themp Member

    Feb 5, 2008
    Raleigh, North Carolina
    Just did a complete shower redo and had always hated the Oatley round shower drain that was used in the original shower. I had ABS on all drain lines and I ended up getting this:

    The tile guy liked it, he was used to the round ones. It was only like 69 dollars for the complete drain and grate. I see now they have stopped selling on their website and you have to buy from a plumbing vendor or plumbing internet site. I never thought about the quality of a drain when I was looking, so not sure how this will hold up. But it seems as good as what I had in the first place.
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