SIGA Majvest® 200 Breathable Facade Membrane for Closed Facades (1.5 x 50 m; 75 m²)

SIGA Majvest® 200 is a breathable, wind and rain tight facade membrane for the permanent exterior protection of wall structures behind closed ventilated facades. One roll is 1.5 x 50 m and covers 75 m².

The membrane has a 3-layer structure: a microporous functional layer reinforced on both sides with polypropylene nonwoven. It is robust, resistant to damage and flexible, so it can be laid quickly, easily and safely. It withstands driving rain while staying vapour permeable, so moisture from the wall structure can dry out. Printed cutting and overlap guides save time on site.

Facade membrane main features

• Roll size: 1.5 x 50 m (75 m²)
• Roll weight: 12 kg
• Structure: 3 layers, PP nonwoven / microporous functional layer / PP nonwoven
• sd value: 0.05 m
• Water tightness: class W1 (EN 1928)
• Temperature resistance: -40 to +80 °C
• Fire class: E (EN 13501-1)
• Integrated adhesive strip (SOB): no
• Printed cutting and overlap guides: yes

Applications

SIGA Majvest® 200 is designed as a wind and rain barrier on the outside of the thermal insulation.

• Closed ventilated facades (timber cladding, panels)
• Timber frame and prefabricated wall structures
• Roofs
• New builds and renovation

How to install the facade membrane

Install the membrane on the outside of the wall structure before the battens and cladding.

1. Position the membrane so that the printed side faces you.
2. Lay the membrane without stretching it, so that no wrinkles form.
3. Align the next sheet on the printed overlap line.
4. Tape the overlap with SIGA Wigluv tape centred on the seam and press it firmly along its full length.
5. Fix battens directly to the load-bearing structure to hold the membrane in place and prevent flapping.

• Tip: SIGA lists Wigluv® 60, Wigluv® 20/40 and Fentrim® 2 50/85 as related products for overlaps and connections.
• Tip: seal pipe and cable penetrations with SIGA Fentrim® Grommet Black.
• Tip: for a membrane with an integrated adhesive strip, choose Majvest® 200 SOB.