Over-Foil Multistrato 19 – Multilayer Reflective Thermal Insulation Sheet
Key advantages
• Multilayer thermal insulation sheet with 19 layers
• Two outer layers of mesh-reinforced pure aluminium
• Exceptionally high thermal insulation in summer and winter
• Built-in vapour barrier
• Reduces thermal bridging and enables effective insulation even where wall thickness is limited
• Lightweight, flexible and easy to install
• Made from recyclable materials, with a high recycled content
• Made in Italy
Why this product
Over-Foil Multistrato 19 is one of Over-All’s highest-performing reflective insulation products.
Its 19-layer structure makes use of the air gaps in the system to deliver exceptionally high thermal insulation while keeping wall thickness relatively small. It also acts as a vapour barrier and contributes to reducing sound transmission as part of the building system.
Technical description
A multilayer thermal insulation sheet made up of 19 layers: two outer layers of protected, mesh-reinforced pure aluminium and 17 inner layers of reflective films, wadding and foamed PE sheets.
The edges are stitched and sealed with a plastic thread system that keeps the thickness uniform even after cutting and helps reduce thermal bridging. The product has been tested in accordance with UNI EN 22097 and is intended for new construction and renovation.
Applications
• Plasterboard walls
• Interior and exterior walls
• Tiled roofs
• Pitched roofs
• Suspended ceilings
• Floors above cold spaces
• Residential buildings
• Commercial and industrial buildings
Technical specifications
Structure:
- 19 layers
- Mesh-reinforced pure aluminium
- Reflective layers
- Wadding layers
- Foamed PE sheets
Thickness:
- 52 mm
Roll dimensions:
- Width: 1.50 m
- Length: 10 m
- Area: 15 m²
Weight:
- 800 g/m²
Roll weight:
- Approx. 12 kg
Emissivity:
- 0.05
Water vapour diffusion resistance factor (μ):
- 90,000
Thermal performance
Thermal resistance of the material alone:
- R = 1.66 m²K/W
In walls:
- One air gap: R = 2.32
- Two air gaps: R = 2.99
- Two layers + one air gap: R = 3.98
- Two layers + two air gaps: R = 4.65
In roofs:
- One air gap: R = 2.11
- Two air gaps: R = 2.57
- Two layers + one air gap: R = 3.77
- Two layers + two air gaps: R = 4.23
In ceilings above a cold space:
- One air gap: R = 2.58
- Two air gaps: R = 3.50
- Two layers + one air gap: R = 4.24
- Two layers + two air gaps: R = 5.27
Acoustic performance
• Contributes to reducing sound transmission as part of the building system.
• Sound insulation of the product itself:
- Rw = 8 dB (without additional layers).
This value refers to the sheet alone. When it is incorporated into a wall or roof system with air gaps and finishing layers, higher performance is achieved, depending on the system.
Fire performance
• Reaction to fire classification:
Class E.
Standards
• UNI EN 22097 – Thermal performance testing of reflective insulation.
• UNI EN 12667 – Measurement of thermal resistance.
• UNI EN ISO 10140-1/2:2021 – Sound insulation testing.
• UNI EN ISO 717-1:2020 – Rating of airborne sound insulation.
• VOC Class A+ – Low emissions of volatile organic compounds.
• Made in Italy.
Installation
• Install with an air gap to achieve maximum thermal performance.
• Suitable for installation in walls, roofs and ceilings.
• Seal the joints with a suitable aluminium tape.
• It is recommended to keep the vapour barrier continuous across the entire building envelope.
• Easy to cut while maintaining a uniform thickness, thanks to the sheet’s reinforced structure.
Sustainability
• Made from recyclable materials.
• High recycled content.
• Manufactured in Italy using locally sourced raw materials.
• Transport volume is more than 6 times smaller than that of rigid insulation boards with similar performance.
• Rated VOC Class A+ for indoor air quality.
