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Butyl Stretch Flex | Penetration Sealing Tape

Siegware

To guarantee air and wind-tightness for the skin of a construction it must have the appropriate foils or panel materials providing a permanent seal at overlaps, gaps, joints and penetration points. BUTYL Dehnflex – Stretch Flex is used particularly as a seal at penetrations points for wind seals, vapour barriers, roof underlays and OSB. Due to its great flexibility the tape can easily be positioned around the openings that require sealing and neatly pressed down. Its extremely good adhesive properties permit work on a variety of substrates mostly without a primer.

Details
Specifications
  • 300 % expandable
  • Thickness: 2 mm
  • Roll Length: 10m
  • Roll Width: 50mm
  • Material composition: Highly flexible butyl rubber tape, adhesive on one side
  • Working Temperature: 5 to 40 °C
  • Colour: Gray
Scope of use

For trouble-free seals at penetration points such: rafters, outlet vents, electrical ducts

Features
  • High elasticity
  • Variable application: One tape for all kinds of penetrations.
About the Brand: Isocell

Based in Austria, Isocell is a prestigious, well known and trusted brand across Europe, they specialise in building airtightness systems, from high performing certified building wraps and membranes, to specialty tools, sealants, adhesives and more.

Siegware is the official and exclusive partner of Isocell in Australia.

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About the
Seller

Founded in 2009, we began by supplying Siegenia hardware to Australia’s emerging energy-efficient window market. Over time, our business has evolved to offer a carefully selected range of premium European-engineered hardware and construction consumables for architectural and low-energy building applications.

Today, we work closely with architects, designers, window and door fabricators, and builders across Australia and New Zealand, supporting projects that demand precision, durability, and performance—without compromising timelines. By maintaining significant stock levels in our local warehouse, we help ensure reliable availability and fast turnaround when it matters most.

Our reputation is built on the quality of our products and the strength of our service. With deep industry experience, we provide practical technical support, dependable supply, and solutions informed by European innovation—delivering real, long-term value for our customers.

Verified ArchiPro Member1 year · Since 2025