A spreadsheet-based computer program called LamLum was created to analyze the economics of value-added laminated lumber manufacturing facilities. Such failities manufacture laminations, typically from lower grades of structural lumber, then glue these laminations together to make various types of higher value laminated lumber products. This report provides the documentation for LamLum. LamLum may be downloaded from the USDA Forest Service, Forest Products Laboratory, website (www. fpl fs.fed.us/documnts/fplgtr/fpl_gtr165/fpl_gtr165 html). Extensive screenshots from the program are presented in this documentation.