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Old 09-16-2009, 07:39 PM   #1
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Mesh Tape & Thinset Questions


Have my bathroom floor all ready for thinset and Hardibacker. I haven't done this before and am not quite sure how to use the thinset and mesh.

First: Do I need to tape and thinset the seams and edges of the subfloor UNDER the hardibacker (as well as on top)?

Second: How exactly do I embed the mesh tape? Do I stick it down first, then trowel thinset over it? If so, do I use the 1/4" notch trowel OVER the mesh tape (seems like it would tend to snag the tape) or...?

Just haven't been able to find any detailed instructions for the mesh tape & thinset.

Thanks very much in advance.

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Old 09-16-2009, 07:43 PM   #2
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Hi Mike, welcome to the forum.

I'm sure someone will move this to the advice forum but it'll still be around for you.

You do not need to add tape to the underside of the hardibacker.

You want to fill your seams with thinset, place your tape over it, then go over it again with thinset and the flat side of your trowel.
Roger (The FloorElf)

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Last edited by TileArt1; 09-16-2009 at 08:11 PM.
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Old 09-16-2009, 07:44 PM   #3
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Hi Mike,
Welcome to the JB forum.

You are overthinking this. Put the tape over the seam or in the corner and cover it with thinset using a flat trowel without teeth. If the tape isn't self adhesive, put the thinset on first.
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Old 09-17-2009, 10:09 AM   #4
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I have a follow-up question. Are you supposed to let the thinset dry before doing anything else?

For no reason other than intuition, I was planning on applying the thinset, then letting it dry before I do any tile work.
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Old 09-17-2009, 10:13 AM   #5
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Dave, you'll find life easier if you taped and mudded the seams as you laid the tile. The reason is that you'll create "speed bumps" with the tape and mud if you do those first and let them dry. This will show up in your tile work. Place the tape over the seam, flat trowel thinset over it to set it in place, then spread and comb out the thinset as usual.

The exception is if you are using a roll-on waterproofing membrane. In that case, you just have to pay attention and reduce the bumps to a minimum when you tape.
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Old 09-17-2009, 10:39 AM   #6
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Thanks for the welcome and the quick response--got it. Wayne, you're right, I was over-thinking it. Thanks for the response, appreciate it.
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Old 09-25-2009, 02:50 PM   #7
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Mesh Tape Redux

Roger and Wayne,

Sorry for the hiatus, my confuser's been in the shop.

One final follow-up before I get started: I forgot to mention that I'll be installing linoleum tiles over the Hardibacker. Does this mean that I should fill the (1/8") expansion joints in the Hardibacker with the linoleum adhesive, rather than with thinset, before taping them?

Thanks again and in advance.

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Old 09-25-2009, 04:03 PM   #8
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Mike, I know it gets repetitious hereabouts, but you really need to read the manufacturer's instructions for the products you're planning to use. You can find James Hardi's recommendations here.

You'll find them to be different from those for ceramic tile. Do pay attention.

My opinion; worth price charged.

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