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Old 12-19-2018, 11:24 AM  
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Bridging over two subfloor types for tile


I'm expanding the extents of my old bathroom and now have two subfloor types I need to run tile over. I have the diagonal plank subfloor (1x6) that now has a couple more floor joists under it and a concrete slab that has been poured with self leveler up to the level of the planks. See the attached pic

Option 1: Thinset and screw 1/4" backerboard over the whole thing and top with ditra, then tile. Option 2: Use a sheet of backerboard on the plank side only and pour up to the edge with another layer of self leveler.
I'm concerned about the tile cracking at the transition and how to screw down the backerboard to the cement(set in thinset)

What would be the best option?
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Old 12-19-2018, 11:29 AM  
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Re: Bridging over two subfloor types for tile


What is under the concrete.?
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Old 12-19-2018, 11:35 AM  
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Re: Bridging over two subfloor types for tile


More concrete on what I'm assuming is a thin cement board over more 1x6 diagonal planks on top of joists. It's VERY solid.
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Old 12-19-2018, 11:44 AM  
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Re: Bridging over two subfloor types for tile


Quote:
Originally Posted by SledgeKat View Post
More concrete on what I'm assuming is a thin cement board over more 1x6 diagonal planks on top of joists. It's VERY solid.
The 1x6 should really have 5/8" plywood over it. I would just be guessing at what to do so wait for others to come along.
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Old 12-19-2018, 11:56 AM  
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Re: Bridging over two subfloor types for tile


See the attached pic of the floor looking back at the plank floor. In the foreground left is the concrete 'pan' with the original tile removed. The self leveling concrete is poured up to that level of the plank that's under the hardwood floor. I have 3/4" from the top of the plank to get to the level of the hardwood in the hallway. I can tell you that there's no plywood anywhere as a subfloor in my house. In the crawlspace looking up, there's only diagonal plank. There seems to be two layers of plank in the hallway at least.
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Old 12-19-2018, 12:20 PM  
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Re: Bridging over two subfloor types for tile


I think if it were me I would have removed everything down to the joist and then shim, lay new 5/8" sub-flooring and then cement board or self leveling. The differentials in stiffness of the (2) surfaces will almost certainly cause grout failures and cracking. The less safe way would be to lay cement board over the connection, but I still think the differential will in support will be a problem.
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