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Old 09-06-2015, 04:02 PM   #1
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durock question of install


Hello, quick question on what's the order to correctly install durock for tile for shower wall, here is what I've figured this far

1- studs-plastic sheeting- durock- tile with thinset
2- studs- durock- waterproof coating - tile with thinset
3- studs- plastic sheeting - durock- waterproof coating - tile with thinset

I've heard if I double waterproof the shower surround, I will trap moisture and cause mold
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Old 09-06-2015, 08:20 PM   #2
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Hi,

You shouldn't do #3 for the reason you mention.

#1 is acceptable, but the plastic or tarpaper on the studs is just a vapor retarder, makes nothing waterproof and the CBU will still get wet if the grout develops some hairline cracks and vapor is still in play.

I recommend #2 cuz nothing behind the two + coats of liquid membrane or a sheet membrane such as Kerdi will ever get wet. The shower will be watertight and the shower will dry faster after use.

Plus if you use Kerdi, you can use regular drywall if you want.

Jaz
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Old 09-07-2015, 08:53 PM   #3
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I just recently did this myself remodeling a bathroom and did option #2- studs- durock- waterproof coating - tile with thinset.

Make sure the waterproof coating is on thick, I had to do a couple coats using a cheap 4" roller to build it up on the durock. Also, make sure you use fiberglass mesh tape or the cement board mesh tape (same thing?) to do your joints.
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