One method of repair might be to mechanically anchors the tiles back to the
wall with stainless steel pins and epoxy. The pins I have seen were about
3/16" diameter x about 3" long set in a 1/4" diameter drillhole. The number
of pins per tile depends on the tile size.
The application I observed was for re-setting some granite cladding which
had popped loose from some precast concrete facia panels. I'm not sure if
slate lends itself to this same procedure.
Smaller tiles might me able to be re-adhered. You should find out what
material was used for the original setting. But, you might be having a
problem with the difference in thermal expansion characterisitics of stone
I would contact Ray Cano of Cano Architectural Concrete Repair in Ontario,
CA. (909)627-5477. Their crews are the best I know of for restoration work
in concrete and stone and can perform work all over the U.S.
Brent R. Koch, P.E.
KOCH ENGINEERING, INC.
From: RShreenan(--nospam--at)aol.com [mailto:RShreenan(--nospam--at)aol.com]
Sent: Saturday, June 03, 2000 11:00
Subject: Stone Veneer
Hi, Sport Fans: I have been asked to inspect a masonry and concrete wall
building, 2 story, with loose slate veneer tiles, 1-1/4" thick on the
exterior walls. I was told that some of the veneer tiles are falling from
the building It seems that the veneer may be slate pavers that were meant
be installed on level grade. The building is in hot, dry Las Vegas. I know
nothing about the proper installation of this product, but I told the owners
I would try to find out if there was a product or method of re-fastening the
loose tiles and stabilizing the remaning tiles. They were not wire tied to
the walls. I was told that they were set with some type of adhesive mortar.
This may be an exercise in futility if the slate is delaminating with a thin
layer of stone adhered to the building.
I know this is a non-structural issue, but it never ceases to amaze me, the
wealth of knowledge that many of the members on this list server have.
I know that brick veneer can be tested for bed joint shear strength with a
push test. Is there a similar test for in-place stone veneer?
Thanks in advance for any info you folks may have regarding this type of
Ray Shreenan, S.E.