Perfectly Welded: How to Create Tight Roof Seams Anyone working with thermoplastic roofing membranes – whether PVC, TPO, FPO, or EPDM - knows one crucial truth: choosing the right welding parameters is essential for seam tightness and, ultimately, the lifespan of the entire flat roof. But how can you ensure optimal welding performance under real-world jobsite conditions? Whether it’s a PVC roofing membrane or a TPO sheet, Leister’s new technical guide offers comprehensive insights into plastic w