House Wrap
Wind and rain protection that performs – from closed walls to open façades
Advanced breathable wind barrier and façade membranes engineered for durable, energy-efficient wall systems.
Control air.
Manage moisture.
Protect performance.
Modern wall constructions demand more than basic protection. They require precise control of air, moisture and durability over time.
Walki®Wall Breath and Walki®Wall Façade are high-performance wind protection underlays designed for different façade structures:
- Walki®Wall Breath: breathable house wrap for closed wall cladding systems, ideal for both new builds and renovations, including modular construction
- Walki®Wall Façade: robust wind barrier for open cladding façades, engineered to withstand UV exposure and visible joint structures
Both solutions combine diffusion-open monolithic barrier technology with robust nonwoven materials, helping to protect insulation, improve energy efficiency and extend the service life of the building envelope.
Product overview
Walki®Wall Breath
Breathable wind barrier for closed façades
A versatile, diffusion-open membrane designed for windproofing insulated wall structures.
Key characteristics:
- Breathable monolithic membrane (Sd 0.08–0.5 m)
- Protects against wind, rain and moisture ingress
- Enhances airtightness and energy efficiency
- Suitable for offsite and modular construction
- Lightweight and easy to install on various substrates
- CE-marked (EN 13859-2)
Structure:
Nonwoven / functional polymer layer / nonwoven (extrusion laminated)
Walki®Wall Façade
Durable protection for open cladding
Engineered for architectural façades with visible gaps (≤10 mm) requiring long-term UV resistance.
Key characteristics:
- Monolithic TPU functional layer
- High UV resistance (up to 5,000 hours exposure)
- Designed for open cladding systems
- Water penetration class W1
- Temperature resistance up to 100°C
- CE-marked (EN 13859-2)
Structure:
TPU coating on polyester nonwoven (extrusion coated)
| Feature | Walki®Wall Breath | Walki®Wall Façade |
|---|---|---|
| Application | Closed wall cladding | Open cladding façade |
| Breathability (Sd) | 0.08–0.5 m (customisable) | ~0.3 m |
| UV resistance | Limited exposure (≤4 weeks) | High (up to 5000h) |
| Structure | PP nonwoven + polymer | PES nonwoven + TPU |
| Airtightness | Excellent | Excellent |
| Temperature resistance | Up to 70°C | Up to 100°C |
Who is it for
Walki®Wall solutions are designed for professionals across the construction value chain:
Façade system manufacturers
Construction companies and contractors
Offsite and modular builders
Building material distributors
Architects and façade engineers
Insulation system providers
Membranes for safer buildings, inside and out
A complete A2 fire-retardant membrane system for moisture control, airtightness and fire safety
Safe buildings require balanced moisture control, airtightness and fire performance. Walki’s A2 fire-retardant membranes provide a complete solution for both the inside and outside of the building envelope.
Together, they regulate vapour flow, protect insulation and enable structures to dry properly, improving durability and energy efficiency while meeting strict fire safety requirements.
Research & Development
Technology & Innovation Behind
Technical Competence Centres
Walki®Wall solutions are developed at Walki’s Technical Competence Centres in Finland, combining in-house coating and extrusion expertise with advanced barrier engineering. This enables the development of diffusion-open, monolithic membrane structures that deliver consistent performance, durability and process efficiency for modern wall systems.
Advancing the future of high-performance wall wrap production
At Walki, we continue to expand our production capabilities to meet the evolving demands of modern construction. Our next-generation production lines, designed with in-house coating and extrusion expertise, set new standards in wind barrier and façade membrane performance.
These advanced technologies enable the production of diffusion-open, monolithic barrier membranes with precise control over breathability, durability and weather resistance. The result is reliable protection for wall structures, without compromising installation efficiency or long-term performance.
As construction methods evolve towards prefabrication and higher performance requirements, Walki®Wall solutions are engineered to deliver consistent quality and adaptability. This development strengthens our ability to support energy-efficient buildings and future-ready façade systems.
What makes Walki®Wall different
Monolithic barrier technology
No micro-perforation. Reliable moisture transport with consistent performance.
Balanced performance
Optimised combination of airtightness, breathability and water resistance.
Application-specific design
Separate solutions for closed vs open façades, avoiding compromise.
Durability where it matters
From controlled indoor exposure (Breath) to high UV resistance (Façade).
Engineered for modern construction
Ideal for prefabrication, fast installation and industrialised building systems.
Sustainability focus
Designed for durability and performance
- Supports energy-efficient buildings by reducing air leakage
- Helps prevent moisture damage and mould growth, extending building lifespan
- Lightweight structures reduce material usage
- Compatible with fibre-based and hybrid wall systems
- Manufactured with a focus on compliance and low emissions (VOC standards)
Performance comparison
| Property | Walki®Wall Solutions | Typical breathable membranes | No wind barrier |
|---|---|---|---|
| Airtightness | High | High | N/A |
| Moisture control | Controlled diffusion | Controlled diffusion | Poor |
| Energy efficiency | Improved | Moderate | Reduced |
| UV resistance | High (Façade) | Limited | N/A |
| Durability | High | Medium | Low |
| Risk of mould | Low | Medium | High |
A wind barrier is a membrane installed behind façade cladding to prevent air infiltration while allowing moisture vapour to escape.
Use Breath for closed wall systems and Façade for open cladding with visible gaps and UV exposure.
It ensures moisture can escape from the wall structure, reducing condensation and mould risk.
Yes. By reducing uncontrolled airflow, they help maintain insulation performance.
Yes, both are CE-marked according to EN 13859-2 for wall underlays.
Build with confidence behind every façade
Discover how Walki®Wall solutions can optimise your wall system performance. Get technical data, samples or expert support for your next project.
