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Unread 08-04-2015, 05:55 PM   #1
916tile
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Preferred Expansion Joint Material

What would your preferred expansion joint material be for a slate exterior balcony? Grout is customs natural grey.
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Unread 08-04-2015, 06:31 PM   #2
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If that's an aesthetic question, Isaac, I'd wanna get the opinion of whomever made the grout color selection.

In general it would be a flexible sealant meeting the applicable requirements of ASTM C920 for the application or one of the pre-fabricated strips available from a number of manufacturers for the application.

We'd need to know more about the installation to get any more specific, I think.

My opinion; worth price charged.
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Unread 08-05-2015, 11:50 AM   #3
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I would like it to look as close to the grout as possible, and the balcony is already set so going with a Schluter part that has legs on it or similar is out of the question. Because it is slate, with an uneven surface I chose not to use the Dilex.
I was thinking a sanded urethene sealant with a backer rod. Again, the grout is Polyblend sanded Natural Gray.
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Unread 08-05-2015, 08:53 PM   #4
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Issac, I did an outside deck about 4 years ago. Slate and CBP natural gray. I ended up using backer rod and CBP's 100% color matching silicone and it worked great. It's a little soft for my tastes but it matched perfectly. The deck is in the weather and I just got an update on it earlier this summer and everything has held up great.

Their silicone meets shore A hardness which is what you need for exterior applications. Urethane is probably a better choice but you won't find a matching color like the silicone. It matched great.
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Unread 08-06-2015, 05:04 PM   #5
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Thanks Jim I'll think I'll try that. My Daltile might stock it.
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