Polymer modified bitumen membranes have been utilized with great success all over the world for decades, and there’s no reason to think things will change anytime soon, according to David Allen of BITEC Inc. “They have a good track record,” said Allen, vice president of operations and technical services for BITEC, which is headquartered in Morrilton, Ark. He asserted that modified bitumen manufacturers and their membranes would survive the ups and downs of the roofing market this year and beyond.