Upgrade your project with this thermally insulated cavity closer, designed to improve cavity wall insulation and eliminate cold bridging. Suitable as a window cavity closer or door cavity closer, each PVCu unit adjusts to fit cavity widths of 50-100mm for a secure, airtight finish. Made with an EPS insulation core and a durable rigid frame, this UPVC cavity closer enhances energy-efficient window installation and supports long-term performance. With certification from BDA Kiwa, NHBC, and LABC, these fire-rated cavity closers ensure compliance with UK Building Regulations. Ensure superior cavity wall insulation with this 5-piece insulated cavity closer set, ideal for window and door frames, preventing cold bridging. Pack total coverage is 6m. Each unit measures 1.2m and fits cavity widths from 50 - 100mm. Made with EPS core and UPVC frame, this cavity wall closer prevents cold bridging and boosts energy efficiency. Perfect for airtight, thermally insulated cavity installations in timber, steel, or masonry builds. Meets UK building regulations and serves as a fire-rated cavity barrier for new builds, extensions, and refurbishments. Easy to handle and install.