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Unread 01-20-2007, 07:15 PM   #1
kezug
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Hardiback board question

My existing foyer about 40 sq ft had 23/32" Sub floor with 1/4" luan over that stapled. Then the tile was set in mortar on the luan. We never had any problems.

I am replacing the tile because we dont like the current color. So, I removed the luan and will be installing hardiback board 1/4" right on top of the 23/32.

Does anyone see any issues with this?
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Unread 01-20-2007, 07:25 PM   #2
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No, as long as you follow manufacturer's instructions to use thinset under the Hardi before fastening, and aren't switching to a natural stone that needs a stiffer floor (and I'm assuming you are good with the Deflecto for you floor).
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Unread 01-20-2007, 08:31 PM   #3
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I am not going to use thinset on the bottom of the hardiback. My floor is very level. Plus I heard you cant use thinset on Sturdifloor.

What should I do?
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Unread 01-20-2007, 08:37 PM   #4
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Use the thinset under the cbu! It doesn't hold the board down, it fills voids and minor imperfections. If you don't, you lose the manufacturer's warranty. The screws hold it down, the thinset ensures no voids.
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Unread 01-20-2007, 08:58 PM   #5
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So, its ok to put the thinset on the OSB?
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Unread 01-20-2007, 08:59 PM   #6
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Yes, use the thinset. No question about it.
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Unread 01-20-2007, 09:05 PM   #7
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According to Hardi website it recommends an exterior "grade plywood or 23/32" exterior grade OSB,"

How do I konw if my subfloor is exterior grade?

I had to replace a section and I got 23/32" that was painted on the side in Yellow, but the existing 23/32 was painted Grey on the side.

My new section is only like 12 sq ft.
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Unread 01-20-2007, 09:13 PM   #8
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Look at your OSB and you'll find a stamp that says something like "exposure 1" on it. For your 3/4" T&G OSB flooring, I'm sure you'll have it.
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Unread 01-20-2007, 09:17 PM   #9
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I just looked, it does Say Exposer 1.

What does that mean? Am I good to apply the thinset or not good?
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Unread 01-20-2007, 09:20 PM   #10
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Yes, you are good to go to use thinset. Absolutely.

The exposure 1 means that it can take getting wet occasionally during the construction of a house and not become permanently damaged.

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Unread 01-20-2007, 09:22 PM   #11
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That so much!

To be able to take a five min breather and ask questions with quick replies is awesome.

I would offer you a beer if you were here!

Thanks again.
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Unread 01-20-2007, 09:25 PM   #12
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Where can I find some info on tile edging? I have a foyer, (1 step) and I will be putting tile on the facing (toe kick) part of the foyer step. I am not sure about laying the tile...does the top part over hang the depth of the tile so that when the facing (toe kick) is layed in, it all matches? It just seems weird that there will be a slight overhang on that top tile with grout underneath. Am I missing something?
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Unread 01-20-2007, 09:35 PM   #13
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I grabbed some official info on the exposure 1 rating from the APA:
Quote:
Originally Posted by From the APA
Exposure 1 Plywood Panels are suitable for uses not permanently exposed to weather. Panels classified as Exposure 1 are intended to resist the effects of moisture due to construction delays, or other conditions of similar severity. These panels are manufactured with the same fully waterproof glues as used in Exterior plywood; however, because of other compositional factors that may affect bond performance, only Exterior panels should be used for long-term exposure to weather. Exposure 1 panels may, however, be used where exposure to the outdoors is on the underside only, such as at roof overhangs.
As for your foyer step:
What do you have for a step? Normally we don't advocate tiling steps, but it looks like you have more of a 2-level floor with a step on it. Take a look at these stair-nosing pieces made by Schluter. You can always find these in the Schluter link to the right >>>>>>>>>>>>>>
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Unread 01-21-2007, 06:54 AM   #14
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I have some left over 1 1/2" galv. roofing nails. Can I use this to fasten the hardiback board to my subfloor? (using 1 1/2" will pentetrate my subfloor NOTE: I am only dealing w/ about 40sq ft in a small raised foyer.)
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Unread 01-21-2007, 07:01 AM   #15
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roofers will work just fine. They are a little long. I hope there are no pipes.
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