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Unread 03-08-2007, 07:31 AM   #1
Andy Frechtling
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Join Date: Mar 2007
Posts: 1
Materials for building a movement joint

I'm installing 16 inch square porcelain tiles, and plan on using Mapei's Ultracontact mortar. My room has a good cement slab, no crakcs, but the longest dimension is 33 feet. The room is 24 feet wide.

I probably need one movement joint crosswise and maybe one lengthwise. Does anyone know of a source for movement joint filling? Mapei sells a caulk that matches ther grout, but this should be applied over a "material that allows for contraction and expansion. For floor applications, urethane, neoprene, or polysulfide are most often used in traffic areas and silicone sometimes where traffic is not a concern. Traffic areas require a sealant with a shore hardness of 35 or greater." according to TCA.

So what's a source for approximately 1/4 inch thick "urethane, neoprene, or polysulfide"? I plan on filling the joint with that and then caulking over it to produce a "grout line" look.

Or I could use one of the Schlueter system premade joints. Prblem is, they definitely don't match the look of the grout lines.

Any thoughts would be appreciated.

Andy
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Unread 03-08-2007, 07:42 AM   #2
ddmoit
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Welcome to the forum, Andy.

Here's a decent primer on expansion joints. Some of your questions might be answered here:

http://www.johnbridge.com/vbulletin/...ead.php?t=1976
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Unread 03-08-2007, 09:12 PM   #3
Davestone
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That's a good link, but as far as actual products try Tamko.
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