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ISOWINDOW FSB Foam Joint Tape

Siegware

ISOWINDOW FSB Foam Joint Tape is a slow expanding vapour variable foam for a durably airtight and vapour open connection of window and door frames on the building envelope.

Ideal for all energy efficient window and door installs, and for achieving the Passive House standard. The FSB tape is vapour variable, meaning that its vapour-tightness characteristics change according to environmental conditions. It becomes more vapour tight as it gets warmer. This helps keep the moisture out, and the building envelope dry, during the cold months of the year..

Details
Scope of use

At the connection of window / door frame to the building envelope

Features
  • Heat Insulating
  • Sounds Insulating
  • Airtight and Raintight
  • Permanent elasticity
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