Abstract: A method and apparatus for achieving greater insulative value which can be readily incorporated into existing construction techniques. Composite tray segments are formed preferably having a highly reflective facing layer and integrally formed ribs and interconnection members. The tray segments can be coupled together at the interconnection member to form a tray of any desired length. Using an easily applied adapter, the tray can be placed between two purlins as they are commonly used in standard construction. Additional insulation can be laid over the trays under the upper edge of the purlins such that no compression occurs during roof attachment. Additionally, the reflective air rib created significantly increases the insulative value over that of the insulation layer alone.