Rammed earth wall at UBC Okanagan (IMAGE) University of British Columbia Okanagan campus Caption Rammed earth technology, where waste products such as fly ash, are used as sustainable building materials can also be used to make decorative feature walls like this one at UBC Okanagan. Credit UBO photo Usage Restrictions none License Original content 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.