Where can I find information on the Component Additive Method (CAM) for calculating and demonstrating assembly fire endurance?

• Design for Code Acceptance (DCA) #4, CAM for Calculating and Demonstrating Assembly Fire Endurance - describes a procedure to calculate the fire endurance rating of a wood-frame wall, roof, or floor/ceiling assembly. The procedure is based on combining previously determined fire resistance time values for each separate component of the assembly without the need for additional fire testing. 6 pages. (T20) Published 1991.
  
  Download it here: http://www.awc.org/Publications/dca/dca4/DCA4.htm