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Old 11-29-2017, 08:25 AM   #13
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Join Date: Nov 2017
Posts: 8
The project continues and I have more questions (of course).

I have leveled the floor (outside the shower) with Mapei Self Leveler Plus. With the plan to lay 12" x 24" porcelain tiles in about 115 sq ft:

What's down: 3/4" OSB over 2x12 joists 16 OC, Mapei Primer T, max of 1/2" of SLC per above:

1. Would you recommend a layer of 1/4" HardiBacker or do I lay tile on SLC with thinset?
a) if I need HardiBacker, how do I affix it to SLC?
b) if I don't need HardiBacker:
*is Ditra overkill or will it add significantly to the security of the tile to justify the cost?

2. I've read that 1 1/4" is proper substrate thickness. With what's down, I have that, if SLC 'counts'. A Lowes associate said HardiBacker over SLC with BackerOn screws; is this legit advise?

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