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Thread: ANSI Shear Testing Procedures:

  1. #31
    ACO Shower Drain Sales johnfrwhipple's Avatar
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  3. #33
    Retired Defense Industry Engineer jadnashua's Avatar
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    Let me relate a story told to me at one of the training classes:

    A manufacturer's rep was called to a site by a guy that was complaining about the consistency of the thinset. So, the rep asked him to mix up a batch for him. He was noting his watch. Looked at the resulting thinset once the guy was finished with prepping it, then said he'd be back after he checked some things out. Well, a few weeks later, he came back with a bag of thinset and asked the guy to mix it up. He was again looking at his watch. The guy said he was finished...the rep said keep mixing. THe guy stopped again. The rep said keep mixing. Once the manufacturer's indicated time was up, he said okay. Then the let it slake like last time, remixed, then when the guy used it, he said, this is some of the best stuff I've used in a long time. He asked the rep what they changed, and he said 'nothing'...you just mixed it per the instructions. IF you use the specified amount of water and actually mix it per the instructions...in most cases, a quality thinset is fine. Do it by eye, don't look at a watch, you'll not mix it long enough and will likely overwater it to achieve what you THINK is the proper consistency. The differences in smoothness and consistency does make a difference when mixed per the instructions AND it is stronger.

    The ANSI tests actually follow the manufacturer's instructions, and thus are repeatable, and reliable. That's why they get paid, to verify and produce reliable, repeatable, tests of manufacturers' claims.

    As I said, your results are interesting since you are the one doing them and there's likely some consistency, but there's no way we can compare them to ANSI testing since you aren't following the rules by following the manufacturer's instructions to the letter. Digital scales and precise liquid measurement along with proper paddle, time, and speed so one test is comparable to the next, and valid. Now, lots of 'pros' eye it, but they'd get what they paid for if they followed the instructions closer!

    It's a tribute to the thinsets out there in that they do work, even when abused by the end user.

    If you believe the manufacturer's test results, a typical modified is stronger than a dryset mortar. But, in the end, it comes down to how much is enough and how well was it installed and prepped in the first place. Don't follow instructions, and the difference may be enough for one to succeed when another might not. THen, throw in waterproof membranes and high density porcelain tile, and you create other problems. Tile has been set for centuries...thinsets have only been around for some decades...the old stuff worked fine with glass tiles and stone and ceramics (porcelain tile is relatively new in the scheme of things). Again, it comes down to how much is enough. A dryset between a waterproof membrane and an impervious tile has a better chance of achieving maximum strength as all of the cement can hydrate. A modified needs to dry out to provide its design strength, and that can take months.
    Last edited by jadnashua; 07-31-2013 at 06:45 PM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #34
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

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  5. #35
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Default Shear Testing Data for Schluter's Kerdi DS and Mapei's Grani Rapid

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    Default ANSI SHEAR TESTING DATA: November 2013

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    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

  7. #37
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    Default Shear Testing: Test Results for - Kerdi DS, Grani Rapid, Ardex 8+9, Kerdi, X32, QSlpe

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    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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