More membrane equals more performance, which is why thicker is better when it comes to roofing membranes. That’s why Carlisle offers its high-performance Sure-Weld Extra TPO membranes, a product line that consists of its 80-mil standard sheet as well as its 135-mil FleeceBACK and 155-mil AFX FleeceBACK. Carlisle’s Sure-Weld Extra TPO roof systems feature a lower lifecycle-to-cost ratio and longer warranties, two issues that are essential for a truly sustainable, long-lasting roof.