n yarns; a bottom fabric layer underlying the top fabric layer that includes coarse machine direction yarns...http://www.google.ca/patents/US5891516?utm_source=gb-gplus-sharePatent US5891516 - Forming fiber cement articles employed in building materials, i.e. siding, roofing, pipesAdvanced Patent SearchPublication numberUS5891516 APublication typeGrantPublication date6 Apr 1999Filing date12 Jun 19