SIGA Majvest 500 SA 18-inch - Self‑Adhesive Rainproof Breathable Facade Membrane - 460mm x 30.5m roll

SIGA Majvest 500 SA 18-inch - Self‑Adhesive Rainproof Breathable Facade Membrane - 460mm x 30.5m roll

SIGA Majvest 500 SA 18-inch is a fully self‑adhesive, windproof and rainproof facade membrane designed for sealed and ventilated facade systems. The 18‑inch (0.46m) roll width is ideal for narrow zones, window surrounds, transition areas, and detailing work where precision and reduced waste are essential. It offers high adhesive strength, excellent durability, and safe moisture management for long‑term exterior protection. SIGA Majvest 500 SA 18‑inch is a diffusion‑open, fully self‑adhesive facade membrane engineered for external protection of wall structures behind sealed or ventilated cladding. Its sd‑value of approx. 0.15m ensures safe vapour diffusion, preventing moisture accumulation while maintaining the performance of the insulation layer.

The full‑surface adhesive backing provides continuous bonding, eliminating wind‑leaks and ensuring a uniform, secure installation. The membrane adheres reliably at both high and low temperatures, making it suitable for year‑round construction. The split release liner allows fast, controlled installation, especially in tight or complex areas. The printed laying and measuring grid supports precise alignment and efficient workflow on site. SIGA Majvest 500 SA 18‑inch is a premium, fully self‑adhesive facade membrane offering maximum wind‑tightness, rain protection, and safe vapour diffusion. Its narrow 18‑inch format is perfect for precision detailing, window surrounds, and complex facade zones, while its robust construction ensures long‑term exterior durability

CHARACTERISTICS

• Full‑surface self‑adhesive backing - continuous wind‑tight bonding without mechanical fixings.
• High adhesive strength - reliable adhesion in both hot and cold conditions.
• Diffusion‑open design - sd ≈ 0.15m for safe moisture transport.
• Windproof and rainproof - protects the wall structure from weather exposure.
• Split release liner - faster, easier application in detailed areas.
• Printed grid - supports precise cutting and alignment.
• Robust construction - engineered for long‑term exterior durability.

• Window and door perimeter zones
• Narrow facade sections
• Transition areas such as corners, reveals and junctions
• Sealed facade systems requiring continuous wind‑tightness
• High‑performance exterior wall assemblies