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Old 08-14-2008, 07:35 PM   #1
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Finishing cement board in tub area


We are remodeling a small bathroom and have been told not to use drywall compound on the perabase board joints. We have taped the seams with fiberglass tape. Will using the drywall compound hurt or help?

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Old 08-15-2008, 07:48 AM   #2
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Finishing cement board in tub area


What's "perabase"? a cement board?

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Old 08-15-2008, 08:09 AM   #3
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Finishing cement board in tub area


I'm sure they meant PermaBase.
You need to use alkali resistant tape AND screws to install. Use thinset over the taped seams. Drywall compound is a no-no

What about waterproofing?
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Old 08-16-2008, 03:23 PM   #4
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Finishing cement board in tub area


On a DIY show I saw them sealing the cement board in a shower with some kind of green paint. They said is was a moisture barrier. What is this?
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