Green Roof Platforms (image) Virginia Tech Caption Five platforms at the the Research and Demonstration Facility at Virginia Tech were used to test various depths of 'green' roofing. The thickest growth is in the foreground, with unplanted growth material and finally reflective roofing material in the distance. Credit Elizabeth Grant/Virginia Tech Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.