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anchoring natural limestone panels to backup wall

anchoring natural limestone panels to backup wall

anchoring natural limestone panels to backup wall

(OP)
I have a building that was built in the early 50's, 2 storey, with 4 inch thick natural limestone slabs forming the exterior walls.  The structural framing is steel with OWSJ's.  The problem I have is that the stones at corner & roof locations have dislogded/shifted.  A test cut at the roof revealed that very minimal cinch anchors were present at the 2 wythe masonry back up wall/stone panels. I have no drawings for the building but assume there are no lintels along the floor slab locations as the floor slab above the metal deck is typically 2 to 3 inches?  The panels are typically (37.5" x 53.5").
What type of anchorage can I use to attach the limestone panels to the backup wall assuming that they will be taking all the deadload of the panels ie.no lintels at floor slab locations? A detail of the roof level is attached.
any help is greatly appreciated!

RE: anchoring natural limestone panels to backup wall

Not sure, but I believe that limestone is one of these materials that tends to creep over time. Your connections need to allow for that.

RE: anchoring natural limestone panels to backup wall

Suggest you contact the Indiana Limestone Institute for assistance.  This is a specialised area of facade engineering, and few engineers have this type of experience.

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