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Unread 03-30-2008, 07:17 AM   #1
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exterior porch tile

have a rectangler covered porch, screened on two sides. second floor, above grade, unheated space below. the plywood floor has been covered with torchdown roofing. I will be using cement or mud to form slope to drain .
The tile is porcelain 3/8 thick and frostproof.

I've looked at ditra but don't know if the unmodified thinset would work outside. i've always used kerabond/keralastic for outdoor tilework. Noble Deck would let me used the modified but the cost for the membrane is 3x the ditra. Any other choices? any other way to do this?
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Unread 03-30-2008, 07:38 AM   #2
Conceptsplus- Randy Gilmore
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You may be able to use NAC. http://www.nacproducts.com/
Not sure about the bond to mud. May have to skim coat the top with loose thinset. I usually use the Strataflex for exterior. They have a few different options.
Randy Gilmore

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Unread 03-30-2008, 07:38 AM   #3
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The porch floor with the waterproofing membrane should already be sloped for drainage, and the joist structure and subflooring should have been determined to meet the necessary deflection standards.

You'll need to put something under your mud to allow for drainage and to keep the mud from direct contact with the torch-down material if it's to remain intact for a secondary waterproofing layer. That's usually gravel or a drainage mat such as Schluter's Trouba or similar.

I know of no restriction against the use of un-modified thinset in exterior installations.

My opinion; worth price charged.

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