Image: Roof Tile Technology Ltd. The flat, dark grey, BiSolar tile has a power output of 18 W and efficiency of 17.5%, according to the manufacturer. “For each square meter, 9.7 tiles are needed ...

Breccia Imperiale and Silver Root – all based on varieties of streaked stone. Breccia Imperiale is a dark grey tile that Fiandre describes as warm and regal, while Silver Root is a translucent ...