The present invention involves building sheets with a plurality of grooves indented into a surface of the building sheet to provide a guide for cutting the building sheet along the grooves. Preferably, the grooves are arranged in a regularly repeating pattern and are spaced apart by a standard unit of...http://www.google.com.au/patents/US20040255480?utm_source=gb-gplus-sharePatent US20040255480 - Surface groove system for building sheets
