Here is the link to The BNC's tracking link for the Sunslate roof. http://www.sunviewer.net/portals/BNC/ Garrett Garrett Laws, Manager Glaws at hbuilders.net The Copper & Slate Company Fine Roofing and Exterior Finish Carpentry 238A Calvary Street, Waltham, MA 02453 Phone (781) 893-1916 Fax (781) 893-2041