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Unread 03-20-2020, 12:46 PM   #1
speed51133
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Recommend a mortar

Cultured stone, indoors, on cement board, above fireplace. Here is the instruction sheet. https://www.culturedstone.com/resour...llation-guides
The specs are below. I found a mortar that is meets one spec, c270, quikcrete Mason mix no. 1136, but do I also need admixtures or anything?

Any recommendations?
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Unread 03-20-2020, 03:21 PM   #2
cx
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Instructions are a bit nebulous. You planning to use the method they show with their stones bonded directly to the CBU or the one they describe with the cleavage membrane and metal lath, Mike?

They indicate a modified mortar, but I don't know what that means to them.
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Unread 03-20-2020, 03:37 PM   #3
speed51133
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Direct to the cbu.

I know. I'm a bit confused
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Unread 03-20-2020, 03:50 PM   #4
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I don't like any of those veneer manufacturers' recommendations of the use of masonry mortar for installation, 'specially the ones that even indicate the use of Type N mortar. And I know they've had a rather large percentage of failures in those installations over the years, to the extent that at least two, probably more, tile installation product manufacturers have developed installation systems for those manufactured veneer products.

You might wanna contact Laticrete or Custom (and probably MAPEI) to see which of their products they might recommend.

For an interior installation I would likely just bond the veneer material directly to the CBU using one of the modified thinset mortars, possibly one of the LHT mortars depending upon the back of the veneer, and never look back.

If your veneer is very thick and made to have pointed mortar joints, that may be a different story.

My opinion; worth price charged.
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Unread 03-20-2020, 04:01 PM   #5
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Ardex X5
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Unread 03-20-2020, 06:01 PM   #6
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Mason's mix will grab onto the lath but won't bond as well to the stone as thinset. Usually the stones are fairly rough on the backs but I've still seen them break bond when fat mud (Mason's mix) was used, especially outside.

I've never used Ardex but trust Shawn's choice. Many here say positive things about Ardex products.

I have used this Customs thinset for large stone and was impressed. Home Depot has it. https://www.custombuildingproducts.com/TDS/TDS-309.pdf
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