Steico Fix Window Wedge – Wood Fiber Insulation Wedge for Window Sills
The Steico Fix Window Wedge is a premium wood fiber insulation wedge developed specifically for creating a second sealing level beneath window sills. It reliably prevents driving rain, drifting snow, and moisture from penetrating—even under harsh weather conditions. Thanks to its hydrophobic, vapor-open structure and high compressive strength, it seals window connections safely and durably.
Improved Energy Efficiency for Every Building
Whether used in solid masonry or timber construction, this insulation wedge excels—especially in conjunction with ETICS (External Thermal Insulation Composite Systems). On the one hand, it reduces thermal bridging beneath the window sill. On the other hand, it adds an additional water-conducting level that supports the stability of the plaster system.
Easy and Secure Installation
For a flawless installation, use the Steico Multi Fill joint sealant to bond the wedge. Moreover, apply Steico Tape F 20/40 or Tape Black for sealing the connections. Since all components belong to the same system, they work together seamlessly. As a result, installers benefit from a quicker, safer, and fully compliant mounting process.
Why Choose the Steico Fix Window Wedge?
Reduces thermal bridges under window sills
Blocks moisture and water reliably
Compatible with various sill types (aluminum, stone, granite)
Hydrophobic, breathable, and highly durable
Ideal for both renovations and new builds
Fully weatherproof for up to four weeks
Available in lengths of 1.35 m and reveal depths from 100 to 260 mm
Technical Specifications
Material: Hydrophobic wood fiber with functional membrane
Slope angle: 5°
Density: Approx. 210 kg/m³
Thermal conductivity (λ): 0.047 W/mK
Fire behavior: Class E
Vapor diffusion resistance (Z): 7
Water pressure resistance: > 4000 mm
Weatherproof (UV resistance): Up to 4 weeks
Sizes available: 100–260 mm reveal depth / 1.35 m length
Sustainable and Certified
Steico manufactures the window wedge according to strict environmental standards. The use of wood fiber as a raw material ensures a low ecological footprint. Furthermore, all materials are tested for performance and safety. Therefore, this product meets high standards in energy efficiency, durability, and building physics.
