SIGA Majvest® 200 SOB Breathable Facade Membrane with Integrated Adhesive Strip (1.5 x 50 m; 75 m²)

SIGA Majvest® 200 SOB is a breathable, wind and rain tight facade membrane with an integrated adhesive strip (SOB) 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.

The integrated adhesive strip along the edge lets you bond the overlaps directly, without separate tape, and printed cutting and overlap guides save even more time on site.

Facade membrane main features

• Roll size: 1.5 x 50 m (75 m²)
• Roll weight: 13 kg
• Integrated adhesive strip (SOB): yes
• 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)
• Printed cutting and overlap guides: yes

Applications

SIGA Majvest® 200 SOB 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 using the printed markings or the edge of the adhesive strip's protective tape.
4. Remove the protective tape and bond the integrated adhesive strip (SOB) to the sheet underneath.
5. Press the bonded area firmly along its full length.
6. Fix battens directly to the load-bearing structure to hold the membrane in place and prevent flapping.

• Tip: for overlaps without SOB (e.g. cut ends) and connections, SIGA lists Wigluv® 60, Wigluv® 20/40 and Fentrim® 2 50/85 as related products.
• Tip: seal pipe and cable penetrations with SIGA Fentrim® Grommet Black.