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Unread 07-06-2012, 01:39 PM   #1
T_Hulse
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Urethane grout & expansion joints

I'm wondering if there has been any thought to reducing the frequency of expansion joints on a floor with a "permanently flexible" grout on bigger jobs? It just seems like a waste to put in a bunch of soft joints if every grout line is already flexible. Is there any reason to think that urethane grout will not move with the floor?
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Unread 07-06-2012, 04:52 PM   #2
dhagin
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Does the grout manufacturer say anything about it Tom? I haven't used any urethane grout yet, but are you saying that the cured grout is relatively soft like caulk or other movement joint materials?
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Unread 07-06-2012, 05:29 PM   #3
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In discussion I had with one such manufacturer's rep, Tom, it seemed they think it would be better than cementitious grout, but they were not prepared to say it would eliminate the need for movement accommodation joints.

The stuff's not at all squishy when cured, Dana. Not as brittle as cementitious grout, of course, but still very, very firm material.

I think it'll take some side-by-side field testing to really sort it out, and that's not gonna be easy to find. Then you gotta wait maybe twenty years for the cementitious side to tent while the urethane side doesn't. Maybe they'll come up with some sort of meaningful testing.

Sure would be a marketing tool for them if it works, though.
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Unread 07-06-2012, 06:07 PM   #4
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You should still continue the use of expansion joints like you normally would when using cement based grout.
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Unread 07-07-2012, 07:05 PM   #5
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Hiya Tom,
I brought up the same question a while back here.
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Unread 07-07-2012, 07:11 PM   #6
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Quote:
Originally Posted by Cx
I think it'll take some side-by-side field testing to really sort it out, and that's not gonna be easy to find.
Give it ta Mr. Whipple. He'd be all over it.
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Unread 07-07-2012, 10:01 PM   #7
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That's bad, Bill.......LOL.....
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Unread 07-07-2012, 10:05 PM   #8
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Hi Bill

I have to agree!
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Unread 07-07-2012, 11:49 PM   #9
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Whipple does tests for the tests! (Deleted)
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Last edited by cx; 07-08-2012 at 09:21 AM. Reason: Unacceptable name calling
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Unread 07-08-2012, 09:22 AM   #10
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Craig, we don't abide name-calling here, no matter how unpopular the callee might seem to be. Don't do it again.
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Unread 07-13-2012, 09:11 PM   #11
madronatile
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Is it ok to caulk a urethane grout installation the next day, or is any water a no-no?
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Unread 07-13-2012, 09:17 PM   #12
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I've never gotten any problems from it
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Unread 07-13-2012, 10:23 PM   #13
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Far as I heard the answer is NO. Yes the urethane is flexible. But I believe I remember it's compressive strength is extremely high. Somewhat of a oxymoron, but it is supposed to be very hard but flexible when twisted or bent.

The way it was explained to me by our regional rep, is think of it as as hard as a epoxy grout, yet flexible if twisted or bent. If you put it in a vice, it would not compress. So it would provide no flexibility in terms of prevention of tenting.
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Unread 07-14-2012, 06:32 AM   #14
Bill Vincent
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Yeah, but when it DOES tent, it won't crack!
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Unread 07-14-2012, 01:35 PM   #15
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