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Old 09-24-2010, 03:01 AM   #16
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How bad is CustomBlend thinset?


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Originally Posted by racebum View Post
come to think about it, doesn't lowes sell the lacrete unmodifed? no idea if it's any better but it's more costly.
They supposedly have the Laticrete 317 and/or Megabond. My local Lowe's stores don't stock either, though.

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Old 10-05-2010, 10:15 AM   #17
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How bad is CustomBlend thinset?


Just put Ditra on my balcony using Custom Blend. Seems to be stuck down good. I did Redgard the balcony good first and really push Ditra into thinset.

Question:

Best mortar for porcelain tile on top of Ditra?

User-friendly exterior grout? Balcony has roof so does not get too much rain... more likely to have snow blow in.

Thanks for advice
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Old 10-05-2010, 09:38 PM   #18
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How bad is CustomBlend thinset?


Ah....small world, your question was answered at the other place yesterday. Maybe you missed it.

Ditraset is the "official" best thin set for tiling over Ditra. As you may know, Schluter licensed Bostik (Hydroment) to make it to high specs and put the Ditra name on the bags.

Too bad you didn't find these forums before you used Custom Blend under Ditra outdoors. Hope it works well for you.

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Old 10-06-2010, 07:07 PM   #19
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How bad is CustomBlend thinset?


Isn't Custom Blend the wrong thinset to use for this purpose?
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Old 03-02-2011, 12:45 PM   #20
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How bad is CustomBlend thinset?


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I've been working on tiling my kitchen floor over the past few weeks (yes, weeks...I know).

I'm using Ditra underlayment from Schluter and had been following the instructions to the letter, which led me to acquire some CustomBlend thinset mortar, made by Custom Building Products. Schluter recommends an unmodified thinset to use between Ditra and the tile. Unfortunately, I had no sense that the only unmodified thinset available at Home Depot would be such as subpar product, as I have read since using it.

So, here's my situation. I mixed up a 50-lb. bag of CustomBlend last night and used it to put down about 50 of my 12x12" porcelain tiles. This morning I googled the product name to check for advice on curing time and I came to find out that most people who work with tile would suggest that you avoid this product like the plague. Also, I've learned that unmodified thinsets just don't bond very well to porcelain. Apparently, many people use modified thinset on top of Ditra with good success, typically something like Versabond with low additive content. You'd void the warranty from Schluter in the process, but at least you're using something higher quality (generally speaking...there are better unmodified thinsets) that's more likely to bond well.

Anyway, I hate the thought that I may have undermined my tile installation with this single bad choice, but what I am to do about it now? Should I actually rip out this tile and do it over? Or is that more hassle than its worth? What is the likelihood that the CustomBlend might actually fail in some way?
Sorry I couldn't be of any help sooner but I just stumbled on your thread and wanted to set the record straight.

1) You DONOT use Un-Modified thinset to bond any type of tile and stone underlayment (i.e. Schleuter Ditra or Cement/Fiber Board) to your plywood/concrete unless the underlayment manufacture requires you to do so, which I haven't come across.

2) I would never recommend a sub-par product. Custom is not a bad product but if you look at it's specs, neither is it great. Example: Laticrete 255 MultiMax or Laticrete Platinum carry a Lifetime warranty when installed per manufacture requirements. Laticrete will repair any damage as a result of the failure of there product.

3) If an installer/contractor is telling you it's OK to use Custom, which most homeowners can buy at there local hardware store, it demonstrates the Level of Quality and commitment to customers long term satisfaction.

4) Never bond unmodified thinset directly to Porcelain. Most Porcelains are either Semi-Vitreous or Vitreous. Simply terms, Water absorption is almost none. You use a Unmodified thinset to adhere to Porcelain, when the water vaporizes you're left with only mortar adhering to a tile with very little porosity. Always use a Modified thinset such as Laticrete 253 Gold or Higher with Porcelain. In the case of using a Ditra system which requires the use of an unmodified thinset between the tile and ditra mat, simply pre-butter all your porcelain tiles with a modified thinset, allow to dry, than install with a unmodified. Dont' forget to backbutter your pre-buttered tiles wells to get good bond between the modified and unmodified thinset.
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Old 03-02-2011, 04:55 PM   #21
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How bad is CustomBlend thinset?


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In the case of using a Ditra system which requires the use of an unmodified thinset between the tile and ditra mat, simply pre-butter all your porcelain tiles with a modified thinset, allow to dry, than install with a unmodified. Dont' forget to backbutter your pre-buttered tiles wells to get good bond between the modified and unmodified thinset.
Now there's a new one!
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Old 03-02-2011, 05:15 PM   #22
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How bad is CustomBlend thinset?


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Now there's a new one!
Sarcasm?? In either case I hope I didn't confuse. Tried explaining so a consumer can understand. Personally not a big fan of using unmodified thinset with any tile but especially vitreous or semi vitreous tiles like porcelain. If you don't know, well Back Buttering a tile is simply referred to in the trade as a Bond Coat. Flat trowel the back side of the tile to get 100% coverage area. In the case of the Ditra mat in order to meet the manufacture specs requires an unmodified thinset. To get around this and still have a strong bond to Porcelain Tile, I recommend a Bond Coat of quality modified thinset such as Laticrete 253 Gold or stronger allow to cure overnight than install tiles per Ditra. Aloha
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Old 03-02-2011, 05:52 PM   #23
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How bad is CustomBlend thinset?


Appreciate the education.
Thank You.

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