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RE: Foam/Epoxy Injection

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I’ve designed and observed tests of the Delta Plastics Epiceram [which seems to have been renamed BISFOAM-3A&B] for use for improving the out-of plane seismic response of 2-wythe unreinforced brick walls with a continuous separation between wythes.  The foam was used to fill the separation and bond the two wythes together.  For H/t out-of plane response, we concluded that the assembly would respond to out of plane shaking as a single wall of thickness equal to the sum of the 2 wythes plus the separation.  Without the foam, it would have acted as two independent walls of thickness equal to a single wythe thickness.  


I would be skeptical of the foam being effective for improving the in-plane seismic response.  Perhaps in bonding two wythes together, it would help to transfer in-plane shear loads applied to the inner wythe by diaphragm shear bolts through the wall to engage the outer wythe.  I doubt that the foam would be effective for improving the shear capacity of a wall in which the wythes were already bonded together.


Nels Roselund, SE

South San Gabriel, CA


From: Yi Yang [mailto:YI(--nospam--at)]
Sent: Monday, August 01, 2005 6:43 PM
To: seaint(--nospam--at)
Subject: Foam/Epoxy Injection


This might be a long shot, but does anyone have any experience using BISFOAM-3 A&B (, for seismic retrofit of old stone building?  Owner doesn't want to see any steel frames or shot-crete walls on this old stone building.  Epoxy injection?


Thanks for any comments.




Y i   Y a n g,   S. E.            
Santa Rosa, California