The Aluminium Masterline 8 stands at the pinnacle of the Zakuna aluminium external door programme.
An innovative multi-chambered aluminium system integrating advanced insulating materials across three distinct specification levels, the Masterline 8 is designed for projects where low-energy performance is not simply desirable but a project requirement — Passivhaus-certified new builds, ultra-low-energy commercial developments, and major renovations targeting the highest levels of fabric performance. Each specification level builds on the last, progressively increasing thermal break performance and glazing specification, allowing the Masterline 8 to be precisely calibrated to the energy performance target of each individual project without over-specifying where it is not needed.
All Masterline 8 external doors feature precision-sealed frames with continuous perimeter sealing, multi-point high-security locking, and are available with smart access systems and Secured by Design accreditation.
Available in a comprehensive RAL colour range with dual colour options — different exterior and interior finishes — allowing the door to present a bold exterior face while connecting warmly with the interior palette. Matching Masterline 8 window profiles are available across the CS 77 and Masterline 8 window systems for complete building envelope co-ordination at the highest specification level. Visit our External Door Showcases to see the Masterline 8 installed in completed high-specification projects.
