a body assembly of a motor vehicle comprises an outer body structure of a motor vehicle , an interior member disposed between the outer body structure and a passenger compartment at a predetermined distance from the outer body structure , and an inner member comprising a moisture vapor permeable metalized composite sheet comprising a sheet layer having first and second outer surfaces and at least one multi - layer coating on said first outer surface of the sheet layer , the multi - layer coating comprising a first metal coating layer having a thickness between about 15 nanometers and 200 nanometers adjacent the first outer surface of the sheet layer and an outer organic coating layer of a composition containing a metal selected from the group consisting of organic polymers , organic oligomers and combinations thereof , having a thickness between about 0 . 2 micrometer and 2 . 5 micrometers deposited on the metal layer . the metalized composite sheet is disposed within the predetermined distance between the outer body structure and the inner member such that the first metal coating layer faces the outer body structure and the distance between the metalized composite sheet and the outer body structure is at least 6 mm . the body assembly of the invention improves the thermal efficiency of automobiles by reflecting thermal radiation in and out through the roof and / or door panel modules , without increasing the risk of moisture condensations within the modules .