Seamless sheet insulation around roof structural members

A seamless sheet system for attachment to a plurality of purlins of a building, each one of the plurality purlins includes a top flange, a bottom flange and a vertical portion comprising:

• a plurality of straps are attached to bottom flanges of the plurality of purlins;
• said seamless sheet is wrapped over the top flanges of the plurality of purlins and supported by the plurality of straps spanning between the plurality of purlins;
• at least two sheet retention devices having a tubular cross section and an elongated length;
• a double sided adhesive tape includes a first adhesive side, a second adhesive side and an adhesive cover, said adhesive cover is attached to said first adhesive side, wherein said second adhesive side is attached to opposing sides of the vertical portion;
• said seamless sheet is one of retained against opposing sides of the vertical portion of the purlin with said at least two retention devices and retained against one side of the vertical portion of two adjacent purlins of the plurality of purlins with said at least two retention devices;
• and
• insulation is inserted between adjacent purlins of the plurality of purlins, wherein said adhesive cover is removed from said double sided adhesive tape when said seamless sheet is in contact with said adhesive cover, the plurality of sheet retention devices are capable of being removed after said insulation is installed.