Hypak™ can serve as a key waterproof and protective
layer in the building envelope, which helps with water
vapor diffusion within the envelope while keeping the
thermal insulation dry.
Crafted from 100% high-density polyethylene, Hypak™ is a high-performance house membrane wrap that serves as an exceptional breathable house wrap and Weather & Air Barrier System within the building envelope. It functions as a reliable house wrap breathable membrane, helping maintain long-term structural protection in modern building systems. It facilitates water vapor diffusion while maintaining the dryness of thermal insulation, significantly reducing thermal bridge formation, enhancing insulation efficiency, and lowering energy consumption.
Mechanism of Action
Water vapor naturally migrates from areas of higher temperature to lower temperature. Hypak™ employs a specialized air barrier membrane on the warmer side of the thermal insulation and a waterproof, breathable vapour barrier layer on the colder side. This design integrates the function of a vapour barrier and breather membrane, ensuring balanced moisture management inside the building envelope. This configuration prevents water vapor from penetrating the insulation and allows any infiltrated moisture to disperse. By simultaneously dispersing and blocking water vapor, Hypak™, as a high-performance breathable membrane house wrap, prevents accumulation within the envelope, keeps insulation dry reduces cold bridge formation, minimizes freezing and expansion damage, enhances heat retention, and reduces energy consumption.
Technical Performance Comparison
| Property | Hypak™ Flashspun Fabric | Traditional Perforated Wrap | Building Paper |
| Material Composition | 100% High-Density PE | Perforated Plastic Film | Asphalt-Saturated Paper |
| Water Vapor Permeability | High (Breathable) | Low to Medium | Low |
| Air Resistance | Excellent (Air Barrier) | Poor | Fair |
| Tensile Strength | Superior | Moderate | Low |
| UV Resistance | 6-12 Months | 1-3 Months | Minimal |
The integrity of a building envelope depends on the strategic application of high-performance membranes. Flashspun Hypak™ is engineered to adapt to various structural requirements, providing a continuous shield against the elements.
Commercial Building Wrap: High-Rise Durability and Air-Tightness
In commercial and high-rise construction, building envelopes are exposed to extreme wind pressures and environmental stress. Hypak™ serves as a robust commercial house wrap that enhances the building's airtightness. By minimizing uncontrolled air leakage, it significantly improves HVAC efficiency and ensures the structural durability of the exterior facade under harsh weather conditions.
Timber Frame Systems: Essential Moisture Management
Timber frame structures are particularly susceptible to interstitial condensation and rot. Using Hypak™ as a breathable timber frame membrane is critical for long-term health. It allows internal moisture trapped during construction or from daily occupancy to escape (vapor diffusion), while preventing external rain and wind-driven moisture from reaching the wooden studs, ensuring the frame remains dry and structurally sound.
Roofing & Flooring: High-Performance Protective Layers
For Roofing: As a high-tenacity breather membrane for roofs, Hypak™ provides an essential secondary layer of protection under tiles or metal panels. It manages condensation that forms on the underside of roofing materials and prevents water ingress during heavy storms.
For Flooring: When applied to floor joists or ground-floor systems, it functions as a breathable membrane for floors, preventing dampness from rising while allowing the sub-floor assembly to "breathe," which is vital for maintaining indoor air quality and preventing floorboards from warping.
Masonry & Brick Walls: Secondary Drainage Plane
In brick veneer or stone masonry constructions, Hypak™ acts as a breathable membrane for brick walls. It creates a dedicated drainage plane that directs any water that penetrates the outer cladding back to the exterior through weep holes, protecting the inner sheathing from water damage.
Key Benefits:
Enhanced Durability
Superior Moisture Control
High Airtightness
Robust Construction
Sustainability
As a high-performance breathable building wrap, Flashspun Hypak™ offers long-lasting protection while supporting sustainable building practices.
A vapour barrier is impermeable, designed to completely block moisture movement to prevent water vapor from entering the wall assembly. In contrast, a breather membrane (such as Flashspun Hypak™) is semi-permeable; it prevents liquid water and driving rain from entering from the outside while allowing internal moisture vapor to escape. This breathable characteristic is vital for preventing interstitial condensation and structural rot.
Yes, Flashspun Hypak™ is a highly versatile high-performance membrane. In wall systems, it functions as a robust exterior building wrap (Weather & Air Barrier). In roofing applications, it serves as a high-tenacity breather underlayment. Its multi-application capability provides a continuous, integrated weather-resistant barrier (WRB) that enhances a building's overall energy efficiency and airtightness.
Absolutely. By creating an airtight yet breathable seal around the building envelope, Hypak™ prevents uncontrolled air leakage and protects the thermal insulation from getting damp. Dry insulation maintains its full R-value, which significantly reduces the energy required for heating and cooling.
Have any questions about Flashspun Hypak™ ?
(A waterproof and breathable material)
Feel free to reach out to Kingwills's specialists for timely support!
Kingwills International Limited
Kingwills International Limited
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