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Old 10-01-2011, 01:06 PM   #16
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Well after all the horrors of September, it's October, and the custom ordered hex tiles are here and it is thus time to open up that pocket door, put the hardiebacker down and tile.

Bud? Anyone? I'm nervous. I got the Laticrete multi purpose thinset mortar and was given a 3/16 square notch trowel. Is this the right stuff?

Do I understand correctly that I trowel the thinset down and lay the hardiebacker over it, and screw it down wherever the hardiebacker indicates? I have 1 5/8" course thread drywall screws leftover from another job. Will these work in this application or will I be making another trip to Home Depot, where they really owe me a shrine for the generosities of my wallet?

I assume I screw down the hardiebacker while the thinset is still wet, but do I then need to stay off it for a while, or can I go right into tiling over it? And will the same thinset listed above be suitable for setting the tile? And is there anything else I need to know about setting unglazed ceramic tile? I think after I set it in the thinset, I have to give the thinset 24 hours to cure, then I need to use a spray sealer over the tiles because they are unglazed, then sanded grout, then seal the sanded grout with a precise application of sealer to the grout lines?

Thanks a bunch for words of wisdom.

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Old 10-01-2011, 05:07 PM   #17
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Mix the thinset and apply it with a 1/4" X 1/4" square notched trowel. A 3/16" trowel really isn't big enough for the Hardi installation.

After the Hardi is installed and screwed down you can start tiling immediately if you wish. There are special screws recommended for use with Hardi. Drywall screws aren't the ones but you do whatever you want.

I have no idea what "Laticrete Multi-Purpose" is. The Hardi should be installed with unmodified thinset but if you were to use modified thinset it wouldn't be the end of the world.

The tiles you have may be unglazed but that doesn't mean they require sealing. Judging from the tiles you purchased the tiles are more than likely porcelain and they really can't be effectively sealed anyway they are too hard. You should use modified thinset to install the tiles. This may be a good place to use the 3/16" trowel to prevent thinset purging between the tiles.

Those spray sealers are useless, take that stuff back and get the money back you paid for it, it's junk. If you seal the grout use a "paint-on" type sealer and follow the instructions that come with the sealer. Application-windows of sealers vary.
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Old 10-01-2011, 08:47 PM   #18
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Bud, you're awesome. I appreciate having someone who knows. I got the correct Hardie screws with the square driver. When you say "unmodified" I assume that means "just add water" and with modified, I assume that's adding the latex additive to help the tiles set safely.
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Old 10-01-2011, 09:49 PM   #19
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Wrong on the powders---Read this--"Mud" What Is It? - Kitchen & Bath Remodeling - DIY Chatroom - DIY Home Improvement Forum

Unmodified is just a cement based mix--

Modified has powdered latex in the bag mix---(this is what you need)

You can make your own 'modified' by starting with unmodified and adding liquid latex---(Not needed for your job)
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Old 10-01-2011, 10:33 PM   #20
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3/4" ply, then hardi? Prep for hextile, subfloor slope


For clarity, this is what I have...

http://www.lowes.com/pd_40341-73069-...ete&facetInfo=

for use with these hex tiles http://restorationtile.com/

Good with just adding water for right under the hardie backer and right under the tile? I was gifted a 50lb bag, but I can go buy something different if it's needed...
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Old 10-01-2011, 10:55 PM   #21
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3/4" ply, then hardi? Prep for hextile, subfloor slope


I think that's unmodified----you want modified----I'm not familiar with "multi Purpose"

Bud or Jaz will know---Mike---
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Old 10-02-2011, 12:47 PM   #22
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3/4" ply, then hardi? Prep for hextile, subfloor slope


That bag says on it: "polymer fortified", so that makes it modified thinset. It will work.


The tile is in fact porcelain tile so no sealer is required for the tile or prior to grouting. Seal only the grout later.
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Old 10-02-2011, 08:25 PM   #23
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Thanks everyone! I got the hardiebacker down today, and got all my tile laid out and trimmed up and ready to lay. Some evening this week I hope to actually lay the tile. There's always 10,000 things competing for time
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Old 10-19-2011, 07:39 PM   #24
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Bud or a tile guy- help, help! Grouted with Mapei over my hex tiles with Grout Boost. The grout was a BEAR, and I am now sponging off. In the center of each tile, I have to hand scrub off a dark spot with my thumb (its dark grout- platinum color). I'm worried I am not going to make it to each tile before it dries. Is this when I use vinegar, at what dilution, or what do I do? (my husband typing this in)
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Old 10-19-2011, 07:45 PM   #25
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Bud or a tile guy- help, help! Grouted with Mapei over my hex tiles with Grout Boost. The grout was a BEAR, and I am now sponging off. In the center of each tile, I have to hand scrub off a dark spot with my thumb (its dark grout- platinum color). I'm worried I am not going to make it to each tile before it dries. Is this when I use vinegar, at what dilution, or what do I do? (my husband typing this in)
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Old 10-19-2011, 07:46 PM   #26
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3/4" ply, then hardi? Prep for hextile, subfloor slope


NO VINEGAR at this point, no chemicals for now. Use a pot scrubber or something like that. If you have a fiber-type scrubbie that would be the best right now. A bath towel would/should also work if the other items aren't available. The Grout Boost is what's kicking your butt for you. I don't understand why people use that stuff.
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Old 10-19-2011, 07:59 PM   #27
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Thanks for the vinegar advice. A pox on Lowe's for upselling me grout boost. I am using a towel now. What do you think about a dish scrubber (like a sponge with a scrubby side)?

What happens if I do not get this off in time. It's not coming off very well.

Edit: Never mind what I said above. Now I'm typing for myself and my husband is on his on hands and knees with the dish scrubber because I ran out of steam. Shoot shoot shoot now what? It has an aged look like the ooooold hex tile in the neighborhood pharmacy, which isn't horrid in an old house I suppose, but I hadn't planned on them all having that darkened and worn look in the center of most of them. Grrr Lowe's Grrrrrrrrrrrr and some words I can't say here.

Last edited by OurHouse; 10-19-2011 at 08:29 PM.
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Old 10-19-2011, 09:25 PM   #28
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Scrub pads---Curses to the salesmen---
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Old 10-19-2011, 10:08 PM   #29
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3/4" ply, then hardi? Prep for hextile, subfloor slope


If what you've done doesn't work, try sprinkling a little dry grout on a inconspicuous spot then rubbing with a course towel or burlap if possible.

Otherwise leave it and rinse film tomorrow. You can call the people that make Grout Boost and see what they say. Often Sulfamic Acids crystals will do the job, but you have to wait about 10 days before using it.

I would not use that stuff next time, keep everything used in a project from within the same company.

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Old 10-20-2011, 06:55 AM   #30
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3/4" ply, then hardi? Prep for hextile, subfloor slope


Today's grout products are already modified by their manufacturer and they are as improved as they can be. To add a product such as Grout Boost really shouldn't be/isn't necessary. The only thing that is going to do is to wreck the manufacturer's intended chemistry of the product. Grout Boost is nothing more than an opportunity for a store to take more of your money.

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