Do I Need Cork Underlayment? Removing Old? - Flooring - DIY Chatroom Home Improvement Forum
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Old 06-25-2014, 10:27 AM   #1
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Do I need cork underlayment? Removing old?


Am about to retile a small bathroom. The floor is concrete, and there is currently a layer of cork beneath the existing tile. I thought cork in a high moisture area was a bad idea? Is the sole purpose of cork underlayment for noise deadening? Can I just lay the new tile directly on the concrete floor? Is a latex fill necessary? Finally, what is the best way to remove the existing cork? Thanks in advance!
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Old 06-25-2014, 10:32 AM   #2
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Additional info:
Plan to put in 12x24 tile
1/8" grout lines
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Old 06-25-2014, 10:34 AM   #3
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Cork is usually for sound deadening---are you in a condo?

What is the subfloor? Concrete or wood?
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Old 06-25-2014, 10:54 AM   #4
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Quote:
Originally Posted by oh'mike
Cork is usually for sound deadening---are you in a condo? What is the subfloor? Concrete or wood?
No, I'm in a single story house. The subfloor is concrete.
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Old 06-25-2014, 11:52 PM   #5
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Old 06-26-2014, 06:46 AM   #6
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The installer may have used the cork as a decoupling membrane---

If you find cracks or other flaws, consider using Schluters Ditra under your new tile--
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Old 06-26-2014, 06:46 AM   #7
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Cork is fine in your application. Cork does not absorb moisture. However, it isn't really needed. I'd probably opt for a layer of Ditra instead.
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Old 06-26-2014, 09:46 AM   #8
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Thanks for the feedback. Is an underlayment necessary in this application? What is the benefit of laying ditra between concrete and tile - moisture mitigation? If I the concrete is clean and level, is a ditra underlayment still a good idea?
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Old 06-26-2014, 09:54 AM   #9
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Perhaps it should be noted that the slab is not new. It was poured in 1990.
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Old 06-26-2014, 09:59 AM   #10
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Ditra is used as an isolation membrane over concrete that has flaws --

If your concrete has no cracks that appear to be active---then setting directly to the concrete is fine.
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