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Unread 01-06-2007, 03:18 PM   #1
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Join Date: Dec 2006
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Do I need underlayment?

My bathroom floor is going to be pebbles (average about 1/2") over TrueFloor in-floor heating wires filled to level with either self leveling compound or some sort of concrete patch/fill. This is all on a subfloor that passes the deflecto test just fine.

I was originally going to use Ditra and then Kerdi up the walls a bit to make a waterproof pan for the whole bathroom. Now I wonder if Ditra and the small pebbles won't play well together.

The question is: Do I need an isolation membrane at all? If I still want to make the waterproof pan would Kerdi work as an isolation membrane? Is there a better way?
John T
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Unread 01-06-2007, 05:22 PM   #2
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Location: Princeton,Tx.- Dallas area
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Hi John, you would need two inch tiles or bigger to use Ditra. The mud bed will need to be at least 3/4 thick on a small bathroom, thicker is better. You don't really need a membrane over a mud bed although you can if you want to.

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