STROTEX EXPERT is a four-layer roofing membrane from the EXTREME class range, made using modern American technology. Top-grade components and regular testing in the Foliarex group's laboratories ensure consistent quality and long-term reliability. STROTEX is a diffusion-open membrane intended as a preliminary covering layer beneath the roof covering, and it is also an excellent wind barrier for the walls of frame-construction buildings. Because of its low Sd value, the membrane is used on roofs insulated to the full rafter depth, where it is laid directly on the insulation.