To seal or not to seal

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Old 01-25-09, 04:41 PM
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To seal or not to seal

I've seen the question asked, but not answered. I am tiling a basement bathroom floor and heard from some to prep the concrete floor with a waterproofing product like Redgard. Is this necessary or even recommended? The floor is level and has no cracks so I am ready to go, as soon as I get a definitive answer about whether to apply the moisture barrier.
 
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Old 01-25-09, 04:49 PM
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If it has no cracks, you don't need to do it. If you got the extra money, sure, but not required.

Use a good thinset, like Versabond, Flexbond, etc. Do not use anything that comes in a bucket.
 
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Old 01-25-09, 04:53 PM
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What's wrong with the pre-mixed stuff? I've used thinset for smaller projects with no problems.
 
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Old 01-25-09, 05:05 PM
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In spite of what they call it, the pre-mixed stuff is not thin set mortar, it's mastic.

Mastic is not waterproof and will re emulsify if it gets damp for a period of time. It dries very slowly, sometimes taking weeks or months under certain conditions and with large tiles especially porcelain. Tiles are more likely to break, and more chance of grout cracks too. It doesn't fail in every application, but real thin set mortar is much better and much cheaper too.

Jaz
 
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