To access the research papers mentioned in "The life-cycle cost conundrum", click on the following links:

• "2005 Roofing Industry Durability and Cost Survey,," Carl Cash, Simpson, Gumpertz & Heger Inc., Waltham, Mass.
  Available for purchase through RCI Inc.'s Web site.



• "Equivalent Uniform Annual Cost (EUAC): A New Approach to Life Cycle Analysis,," James Hoff, Firestone Building Products Co., Indianapolis
  Available for purchase through RCI Inc.'s Web site.



• "The relative durability of low-slope roofing," Carl Cash, Simpson, Gumpertz & Heger Inc., Waltham, Mass.



• "A documented historical performance of roofing assemblies in the United States 1975-1996," Kenneth G. Schneider Jr. and Anne S. Keenan, Roofing Communications Network, Charleston, S.C.

This Web exclusive information is a supplement to Technical Elements.