Aluminium Vapour Barrier

An aluminium vapour barrier is the critical line of defense in modern building envelopes, designed to completely halt moisture migration where traditional materials fail. While many construction projects still rely on a standard bitumen waterproof membrane for external water shedding, these asphalt-based products often lack the precision needed to stop internal water vapor. Unlike a bitumen waterproof membrane, which can be permeable to vapor and prone to temperature-related softening, an aluminium barrier offers a near-zero permeability rating (often <0.01 g/m²hPa), creating an absolute seal that prevents condensation within insulation layers.

The necessity of this upgrade is backed by stark data. In cold climates, homes using only traditional barriers experience up to 40% higher rates of interstitial condensation, leading to mold growth and a 25% drop in thermal efficiency over five years. By contrast, aluminium barriers maintain consistent performance regardless of humidity spikes. Physically, these barriers feature a high-purity aluminium foil layer (typically 12-50 microns) laminated to reinforced kraft or polymer scrims, providing exceptional tensile strength (>300 N/50mm) and tear resistance that a fragile bitumen waterproof membrane simply cannot match.

This robustness makes them ideal for high-humidity zones like indoor pools, saunas, and commercial kitchens. Installing an aluminium barrier ensures that insulation stays dry, preserving its R-value and extending the structural life of timber frames by decades. It is not just an accessory; it is a fundamental requirement for energy-efficient, durable construction that outperforms legacy asphalt solutions in every measurable metric.

Feature	Specification	Core Benefits / Description
Dimensions	Width: 1.0 m / 1.5 m	The 1.5m width minimizes overlap seams, reducing the risk of vapor leakage. Standard roll lengths facilitate transport and on-site cutting for various space sizes.
	Roll Length: 50 m / 100 m (Customizable)
Material Structure	Base: High-Density Polyethylene (HDPE) / Reinforced PE Grid Mesh	The PE grid reinforcement provides exceptional tear resistance to prevent installation damage. The high-purity aluminum layer not only blocks vapor but also reflects over 95% of radiant heat, offering dual energy-saving benefits.
	Surface: Vacuum-Deposited Aluminum Layer (99% Purity)
	Weight: 120g/m² – 200g/m²
Vapor Resistance	Water Vapor Diffusion Equivalent Air Layer (Sd Value): > 100m (Near Infinite)	Acts as a super vapor barrier, virtually stopping all water molecule transmission. Effectively prevents condensation accumulation within insulation, eliminating mold growth and timber rot. Ideal for extreme humidity zones like saunas.
	Moisture Transmission: ≤ 0.5 g/m²·24h
Thermal Reflectivity	Radiant Heat Reflection: ≥ 95%	Reflects indoor heat back into the room like a mirror, significantly reducing heating costs. In summer, it blocks external radiant heat, helping maintain stable indoor temperatures.
	Emissivity: ≤ 0.05
Physical Strength	Tensile Strength: MD ≥ 200 N/5cm, CMD ≥ 180 N/5cm	The built-in PE reinforcing grid ensures high toughness, puncture resistance, and tensile strength. It withstands installation stress and minor impacts during subsequent construction without rupturing.
	Tear Strength: ≥ 30 N (Trapezoid Method)
Temperature & Chemical Resistance	Temp Range: -40°C to +120°C (Short-term up to 150°C)	Excellent temperature stability makes it the ideal choice for saunas and high-temperature pipe wrapping. It remains flexible and intact under extreme thermal cycling without becoming brittle or delaminating.
	Chemical Resistance: Resistant to acids, alkalis, and corrosion
Safety & Eco-Friendliness	Non-Toxic, Odorless, No Fiber Shedding	The smooth, dense surface inhibits bacterial growth and releases no harmful volatiles. Select models meet food-contact standards, suitable for spaces with high hygiene requirements.
	Mold & Bacteria Resistant
Installation Accessories	Specialized Aluminum Foil Tape / Double-Sided Tape	Crucial: Must be used with specialized aluminum foil tape to seal all overlaps and nail penetrations. This creates a continuous, airtight vapor barrier system ensuring zero leakage.