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Unread 08-02-2020, 01:00 PM   #46
vickyprodify
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Dan,
Your take on the 1/8 dip in the subfloor???

Thanks
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Unread 08-02-2020, 01:50 PM   #47
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How long and wide is the dip? But assess that after you install whatever type of backer you plan to install over the plywood.
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Unread 08-02-2020, 01:57 PM   #48
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Its gradual 1/8 being the deepest.. prob over 3ft length.


So i shud put the backer on and then decide?
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Unread 08-02-2020, 02:07 PM   #49
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Quote:
Originally Posted by Vignesh
So i shud put the backer on and then decide?
That's how I'd do it.
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Unread 08-02-2020, 02:14 PM   #50
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If I still have the dip after puting the backer on.. do u suggest

SLC? or just compensate via Thinset mortar??

im using 9" x 47" tiles
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Unread 08-02-2020, 02:27 PM   #51
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If the dip is still there, and I suspect it will be if you install the backer correctly, and given the fairly small area, and accounting for the likely hood that your long tiles are probably bowed to some degree, and seeing as how it's only 1/8" at it's deepest, I would fill the depression with thinset mortar using a straight edge to screed it.

Disclaimer: technically that's not the right application for thinset mortar. Reality: it'll work just fine under the circumstances above.
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Unread 08-02-2020, 02:42 PM   #52
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Last question hopefully....

should i mortar down the hardie board or just screw them down to plywood with hardiebacker screws???
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Unread 08-02-2020, 02:48 PM   #53
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The installation instructions for Hardie on a floor specifies thinset mortar between the two, in addition to the screws. They also specify what size trowel to use, how to place/space the panels properly, etc.
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Unread 08-02-2020, 02:50 PM   #54
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Thanks Dan. Appreciate it
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Unread 08-09-2020, 06:25 PM   #55
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more questions.

Do I need waterproofing under the tile? I am doing tile rug in the middle with 8 x 47 porcelain tiles. I assume none of the tiles are water proof. Hardie backer under the tile is only mold resistant. Although I don't expect pools of water in the floor area outside shower, would it be a good idea to tack on a layer of waterproofing, may be a 1\8 Ditra?

If this is the case, Can I go with 1\4" hardie backer with Ditra on top? or should i keep 1\2" hardie back with Ditra on

I guess I can also use hardie back with 100% hydrodefense... they say its 100% waterproof

Remember i have a 23\32 T&G OSB underneath all this.

Thanks as always for ur opinions and suggestions
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Unread 08-09-2020, 07:02 PM   #56
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Vignesh, I'll suggest once again that you go to the Hardiebacker website and download the Installation Guide.

In there you'll find that James Hardie always recommends his 1/4" product for floor applications unless you simply want to raise the height of your finished floor, which I don't think you want to do.

As for waterproofing, the bathroom floor is not normally considered a wet area, but if you want to waterproof it you certainly may. If you want to do it with a product such as Ditra, you'll use only the Ditra and install that per the manufacturer's instructions. You do not want to install a CBU and then the Ditra. You could also install the Hardiebacker and then coat that with a much thinner product such as one of the liquid-applied direct bonded waterproofing membranes.

My opinion; worth price charged.
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Unread 08-09-2020, 10:22 PM   #57
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Ditra on a floor is installed instead of cbu. TO make it waterproof, you need to use KerdiBand on the seams, and if you expect a flood, maybe up the walls, too. It will still flow out the door, though if it gets deep enough!
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