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Re: Cantera Stone Attachment to Steel Frame Arch
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Cantera Stone Attachment to Steel Frame Arch
- From: "Keith De Lapp" <kdl(--nospam--at)directcon.net>
- Date: Thu, 15 Nov 2001 11:36:23 -0800
Please see below for my response.
> I need to know if anyone has successfullly attached
250# pieces of pinon cantera stone to a tube steel
> moment frame in the
shape of an arch.
I don't have any experience with this particular
stone, but have on many occasions hung varying kinds of Granite and Marble
> The fabricator has suggested using expansion anchors
and steel L-angles welded to the tube steel.
You "really!" do not want to fasten the stone directly to
structural steel. The preferred method is to anchor the stone to a light
weight tube steel frame and fasten the tube steel frame to the structural
> I think the expansion anchors will blow out the
stone if placed too close to the edge.
You "really!" do not want to use expansion anchors,
period. Contact the manufacturer of the stone and tell them you need
dovetails cut in back of the stone. They will also be able to hook you up
with some dovetail anchors that you can attach to the tube steel frame.
Someone needs to be paid to coordinate all this. Is this in your scope of
> Does anyone have any info on the strength of cantera
stone or an acceptable
> edge distance?
Again you need to contact the manufacturer and ask if they
can provide you with a test report "C880-96", ASTM C880 Standard Test
Method for Flexural Strength of Dimensional Stone. You need this report to
efficiently design the anchor pattern. The flexural strength of stones I
have worked with vary between 1,000 psi and 1,500 psi.
> The stone looks porous and has pockets of volcanic
> minerals. For this reason, I think epoxy adhesive would
be more reliable.
You can certainly use epoxy, but I think it would be
prudent to backup the epoxy design with values derived from actual
tests of a full scale connection assembly. Precast fabricators do
this kind of work all the time. They have taken the time and trouble to
complete "all" the steps above to assure themselves their designs will
The thought of a 250# piece of granite falling to ground
carries with it substantial liability. Is your laibility insurance paid
Go visit a precaster and see if they will share with you
any design concepts. Many have developed proprietary methods for attaching
Keith De Lapp