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Stone Failures- Why? Part II
Article #1, Article #2, Article #3, Article #4, Article #5, Article #6, Article #7, Article #8, Article #9, Article #10, Article #11, Article #12

Changes in Fabrication
Adding of polyester and epoxy coatings with fiberglass mats on the back of the stone is a change in fabrication.
Instead of bonding the setting adhesives to the stone directly, the setting materials are now bonding to other than the stone surface.
Portland cement including modified mortars will bond to stone surfaces.
Portland cement will not bond to polyester.
Portland cement will not bond to epoxy.
Portland cement will not bond to resins.
Portland cement will not bond to mastic.
Entire projects have failed due to lack of communication of changes in fabrication.
Epoxy will bond to polyester.
Epoxy will bond to epoxy.
Epoxy will bond to Portland cement.
Epoxy will bond to resins.
Epoxy will bond to mastic.
The theme here is Portland cement will not bond to epoxy or polyester resins, and epoxy will bond to Portland cement.
The tile industry has not printed this information, with the exception of a cartoon created by Donato Pompo, CTC, which was published in Tile Industry News.
Broadcasting sand into resins or epoxy does not make the backside of the stone compatible with Portland cement mortar.
If in doubt as to what will effectively bond to changes in fabrication, we encourage you to work with your favorite adhesive manufacturer.
Send the stone to the adhesive manufacturer for testing in their laboratory.
The adhesive manufacturer will confirm to you what setting material will work best with altered natural stone surfaces.
This process includes thinking and working with agglomerate tiles and stone.
You, the importer, are liable for changes in fabrication.
You are responsible to educate installers of altered stone surfaces which have occurred from changes in fabrication as to what workmanship requirements are necessary in order to make the installation last and perform.
A good example would include Bob Young's articles on green marble.
Stones subject to curling and crowning require special attention to setting materials that will not contribute to/or aggravate the moisture sensitive stone.

This article is part of a series of articles on Stone Failures (Dec. 2000) by Greg Mowat

Forensic Tile Consultants
9541 Vervain Street
San Diego, CA 92129-3523
(858) 484-8118, Fax 484-8302


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