Over-Foil 2L-2 – Heat-Reflective Thermal and Acoustic Insulation Membrane
Key advantages
• Thermal and acoustic insulation in one product
• Two polyethylene air-bubble layers
• Pure aluminium on both sides
• Reflects radiant heat and improves thermal insulation
• Reduces condensation and moisture build-up
• Lightweight, flexible and easy to install
• Also suitable for duct and pipe insulation
• Made in Italy
Why this product
Over-Foil 2L-2 combines thermal insulation and acoustic insulation in a single product.
Its construction, with two air-bubble layers and pure aluminium on both sides, reflects most of the radiant heat, improves the thermal insulation of the air cavity more than fourfold and also helps reduce sound transmission in building assemblies.
Technical description
A heat-reflective thermo-acoustic insulation membrane made of two layers of polyethylene bubbles filled with inert air, faced on both sides with protected pure aluminium foil.
The membrane acts as a radiant heat reflector, a vapour barrier and a material that helps improve the sound insulation of walls, roofs and ceilings when incorporated into a building assembly with an air cavity.
Applications
• Interior and exterior walls
• Tiled roofs
• Metal roofs
• Ceilings
• Air-conditioning duct insulation
• Pipe insulation
• Residential buildings
• Commercial and industrial buildings
Technical specifications
Construction:
- Two polyethylene air-bubble layers
- Pure aluminium on both sides
Thickness:
- Approx. 6.5 mm
Roll dimensions:
- Width: 1.20 m
- Length: 25 m
- Area: 30 m²
Weight:
- 340 g/m²
Emissivity:
- 0.05
Water vapour resistance factor (μ):
- 30,769
Operating temperature range:
- -20°C to +80°C
Thermal performance
• Thermal resistance: R = 1.49 m²K/W
• Improves the thermal insulation of the air cavity more than 4-fold.
• Reduces heat loss in winter and heat gain in summer.
• Helps reduce thermal bridging.
Acoustic performance
• Provides sound insulation as part of a building assembly.
• Wall insulation improvement:
- Rw 54.8 dB in a wall assembly with an air cavity.
• Additional wall insulation improvement:
- Rw 54 dB in a wall assembly with a double air cavity.
• Impact noise insulation improvement under floors:
- ΔLw 33 dB.
Important: The sound insulation values refer to the complete tested building assembly, not to the membrane alone.
Standards
• UNI EN 12667:2002 – Thermal resistance measurement.
• ISO 140-3:1995 – Sound insulation testing of walls.
• ISO 717-1:1996 – Rating of airborne sound insulation.
• UNI EN ISO 717-2 – Impact noise measurement.
• UNI EN ISO 140-6 – Impact noise testing.
• EN 826 – Compressive strength.
• NEN-EN 12311-1 – Tensile strength.
• Origin: Made in Italy.
Installation
• Install with an air cavity to achieve maximum thermal performance.
• Can be installed in walls, roofs and ceilings, and on ducts and pipes.
• Seal the joints with a suitable aluminium tape.
• Maintain the continuity of the vapour barrier layer.
• We recommend avoiding compression of the membrane, to preserve the effectiveness of the air layers.
