Carlisle has led the single-ply industry for over 45 years in product innovation, customer enthusiasm and system integrity. And now, we have achieved an industry milestone with the production of our 12 billionth square fo......Carlisle has led the single-ply industry for over 45 years in product innovation, customer enthusiasm and system integrity. And now, we have achieved an industry milestone with the production of our 12 billionth square foot of single-ply membrane.