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Unread 08-28-2019, 01:30 PM   #1
Humphreyp
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Tile over finished oak floor.

I have a nice polyurethane oak floor. Pretty solid. Good shape no deflection.

Can i run 1/4" hardi. 1 5/8" screws and tile away? No doors or radiators to worrie about.
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Unread 08-28-2019, 02:30 PM   #2
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have you checked the framing for deflection?
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Unread 08-28-2019, 02:39 PM   #3
Humphreyp
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Yes. Its fine. The question would be about hardi an tile over oak
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Unread 08-28-2019, 02:42 PM   #4
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For clarity, do you mean to say you have an oak tongue and groove conventional strip floor with polyurethane as a finish?


Assuming yes above, no approved method will specify the hardwood floor as a suitable substrate for tile assembly...Hardi Backer or not. You need to get to subfloor beneath.



I would check joist structure before anything, though.
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Unread 08-28-2019, 03:06 PM   #5
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When you say the joist structure is fine, what do you mean?
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Unread 08-28-2019, 03:06 PM   #6
Humphreyp
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Yes. And thats what i thought peter
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Unread 08-28-2019, 03:07 PM   #7
Humphreyp
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Mike....by yes i mean the floor frame work is acceptable deflection wise.
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Unread 08-28-2019, 05:10 PM   #8
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Patrick, it's your floor and your tile and you can install it any way you like, but no manufacturer of CBUs, nor the ceramic tile industry, will approve an installation over sawn board flooring.

My opinion; worth price charged.
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Unread 08-28-2019, 05:54 PM   #9
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Agreed.
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Unread 08-29-2019, 03:01 PM   #10
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refinish those hardwoods?
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Unread 08-29-2019, 03:19 PM   #11
jadnashua
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The issue is two-fold...ensuring planks are well attached so they can't move is tough and impossible if they're not T&G without way too much work, and more important, solid lumber moves way too much with seasonal humidity changes to allow tile to survive long-term. You need something more stable, which is typically plywood, then, you can add your choice of thinset compatible material that could be cbu, or a special membrane designed for this.
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