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Unread 12-30-2019, 10:59 AM   #1
Montila
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Porcelain Slab Counter Underlayment?

We are having installed a 2 cm porcelain slab for our kitchen countertop. All of the professionals we have asked say we do not need to do the plywood/Ditra underlayment that the slab websites say is basically mandatory. It’s a fairly new product here in the Montana (especially the 2 cm), and it’s dry here (not much expansion/contraction). We don’t want the mitered edge, so that creates the issue of adding 3/4” (Kerdi + plywood + mud) and hiding it. Sure, it would be easiest to not have any underlayment like everyone is proposing, but is cracking really going to be an issue with the no underlayment? It’s pretty tough stuff, and there are no spans greater than 30” at most. I really don’t want any problems down the road, but am not into overkill either. Please advise, underlayment or no underlayment, and how to have cleanest edge if underlayment is mandatory, and if it is mandatory, why don’t fabricators do it? Thanks!
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Unread 12-30-2019, 11:00 AM   #2
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Montila,

Welcome to the forum.

Who is the manufacturer?
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Unread 12-30-2019, 04:19 PM   #3
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Quote:
Originally Posted by Montila
We don’t want the mitered edge, so that creates the issue of adding 3/4” (Kerdi + plywood + mud) and hiding it.
Not sure I understand that part.

In my area the fabricators with whom I've dealt will install 3CM material directly on the cabinet box, but not the 2CM material.

The stone edges, when a plywood sub-top is used, are generally doubled stone material at the overhang shaped in one of several profiles.

[Edit] I just noticed you're talking about a 2CM porcelain slab rather than a natural stone. I've never done one of those and don't know whether it would be treated differently from a stone slab.
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Last edited by cx; 12-30-2019 at 04:27 PM.
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Unread 12-30-2019, 04:22 PM   #4
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There are times we have set plywood inside the upper reaches of each cabinet to support the surface, but you have to keep an eye on clearances for drawers and appliances.
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Unread 12-31-2019, 07:44 PM   #5
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Manufacturer is Bedrosians.

The manufacturer is Bedrosians. Thank you for your comments!

Kristen
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Unread 01-02-2020, 12:30 PM   #6
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Montilla said it is "porcelain slab," not stone.
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Unread 01-03-2020, 09:45 AM   #7
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?

Does no one work with porcelain slabs?
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Unread 01-03-2020, 09:48 AM   #8
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Bedrosians is more likely to be a distributor / retailer of the product and not the manufacturer.

Can another Pro correct me if I'm wrong?
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Unread 01-04-2020, 09:52 AM   #9
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Correction

Thanks, Paul. I was wrong! You are correct, Bedrosians is the importer or distributor. I do not know who makes it for Bedrosians, although I have heard some is made in Tennessee, some in Italy or Spain.
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