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Message: [QUOTE="IthacaBarrel, post: 3478248, member: 363"] It's most likely a TPO or a PVC roof with polyiso insulation. The seams are usually heat welded. The blue sheet is what they call a slip sheet which allows for expansion and extraction of the roofing materials. If anyone wants to really dig deeper most commercial roofs in this area are supplied by two major manufacturers Johns Manville or Carlisle, maybe GAF here and there but that's about it. Not in the roofing business but bet around enough to be slightly dangerous and yelled at by many roofing contractors for walking on their roofs when trying to get some other things done. I would bet it's either a Manville or Carlisle system.[/QUOTE] [/QUOTE]