fire rating of 4-inch thick concrete wall

huangyhg

fire rating of 4-inch thick concrete wall
i have a pre-cast concrete building that will have four-inch wall thickness. if i recall correctly, this should give at least 2 hours of fire rating. am i correct?
lutfi
i would think so - you would have to check the ul book or within the ibc (i re  
the pci manual addresses this (5th ed - fig 9.3.2, 6th ed - fig 9.3.6.1).  
a 4" thick carbonate agregate concrete wall will give you 1 1/2 hour fire rating.  if you use light weight concrete you can get a 2 1/2 hour rating.
(using carbonate aggregate concrete wall you'd need a 5" thick panel to meet a 2hr fire rating.)
i hope this helps.  if you want a copy of the charts your local precaster might be able to fax a copy of it over to you.
astructural,
i found the same table. thanks for your help.
lutfi