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RE: jailbreak through CMU

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For what its worth the thread started:


I’ve always wondered about duration factors for prison “live loads” on reinforced CMU walls. Apparently it works out to two inmates with primitive tools for about 3 weeks.,2933,317100,00.html


Christopher Banbury, PE



Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia

From: Daryl Richardson [mailto:h.d.richardson(--nospam--at)]
Sent: Wednesday, 19 December 2007 12:51
To: seaint(--nospam--at)
Subject: Re: jailbreak through CMU


Fellow engineers,


        For what it's worth there was a news item on Canadian news broadcasts tonight showing that two inmates had just escaped from an American jail so I guess it can really happen.  The worst part is that these guys are high risk violent offenders!!!




H. Daryl Richardson

----- Original Message -----

From: Josh Plummer

Sent: Tuesday, December 18, 2007 6:42 PM

Subject: RE: jailbreak through CMU


I had a pretty well known engineering friend tell me how he had a handy man type guy to build him a patio wall around his back yard.  The guy really seemed to know what he was doing, so he just let him work without bugging him at all.  The final product looked good, but when Northridge hit the wall basically fell down.  When he called the guy back, the guy explained that he thought the grout was to strengthen the cells that did NOT have the rebar in them. :)


Josh Plummer, SE


From: Jordan Truesdell, PE [mailto:seaint2(--nospam--at)]
Sent: Tuesday, December 18, 2007 1:01 PM
To: seaint(--nospam--at)
Subject: Re: jailbreak through CMU

How (almost) timely; I just finished a value engineering exercise on a jail. Those cells were precast concrete - we didn't suggest any changes there.

I also saw the ungrouted cell with interest. I once had an owner-building as me how she was supposed to get the rebar into a window jamb after she set the solid precast lintel. She was quite surprised to find out that she had to grout those cells - she expected that putting the rebar in would be enough!