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Firewall Construction

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I am trying to understand the general requirements  and details for firewall construction.  All the firewalls I have designed were masonry and were restrained near the top of the wall.
Have any of you used insulated panels, (metal skin /foam insulation), for firewalls?  I have a spec sheet from a supplier that indicates that they can get 3 hours on their panel. 
This project involves a large freezer structure with a firewall down the middle - (project is still preliminary - I'm not sure yet if this is really a firewall or an area separation wall).
Assuming the panel indicated above will work, could we achieve a four hour wall by using 2 panels with some separation between the panels, say 3", but attach each panel to its separate structure?
Any thoughts will be appreciated!

Bobby Jenkins, P.E.
Jenkins Engineering, Inc.
PO Box 2101
Tupelo, Ms  38803
662.840.1233 V / 662.840.1103 F