Multi+ 10mm Fire Rated Multi-Layer IXPE Reflective Insulation
Eight-layer, net-reinforced IXPE multi-foil with a triple-barrier FR core. Reflects 98% of radiant heat, BS 476 Class 0 / Class 1. 9 to 10 mm, rolls 1.20 / 1.35 m wide, 12 to 36 m² per roll.
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Description
Multi+ 10mm fire rated multi-layer IXPE reflective insulation
Eight-layer, net-reinforced multi-foil insulation with a triple-barrier FR core. Reflects 98% of radiant heat, BS 476 Class 0 / Class 1.
Multi+ 10mm is a silver multi-layer IXPE reflective insulation with 99% pure aluminium foil on both faces over a triple-barrier core of FR air bubble, FR IXPE foam and FR air bubble. An additional 18 µm foil with bi-directional reinforced net makes it tear resistant, and the IXPE foam core acts as a thermal break. It is built for roofs, ceilings and walls that need more than a standard bubble foil can give.
Also see our Alumix Gold Multi-Layers reinforced foil insulation.
What is Multi+ 10mm reflective insulation?
Multi+ 10mm (product code TRP-10-FRNT) is an eight-layer IXPE multi-foil. Its construction is pure aluminium foil / bonding / 3.5 mm FR air bubble / 3.5 mm FR IXPE foam / 4 mm FR air bubble / bonding / 18 µm pure aluminium foil + reinforcing net.
It combines three actions in one sheet: vapour barrier, radiant heat barrier and thermal break. It is classified BS 476 Class 1 / Class 0 and tested to AS/NZS 1530.2 and 1530.3.
Key benefits
- Reflects 98% of radiant heat. 99% pure aluminium foil on both faces.
- Fire rated. BS 476 Part 6 Class 0 and Part 7 Class 1, tested to AS/NZS 1530.2 and 1530.3.
- Three actions in one sheet. Vapour, heat and thermal break barrier.
- Triple-barrier core. FR bubble, FR IXPE foam and FR bubble.
- Net-reinforced, tear resistant. 18 µm foil with bi-directional net bonded to the foil.
- Eight-layer build, foil on both faces. Reflects heat from either direction.
- Does not absorb moisture or support mould. Performance does not drop over time.
- No glass fibre, safe to handle. Lightweight and easy to cut and install.
Technical specifications
| Product type | Silver multi-layer IXPE reflective insulation |
|---|---|
| Product code | TRP-10-FRNT |
| Construction | Pure aluminium foil / bonding / 3.5 mm FR air bubble / 3.5 mm FR IXPE foam / 4 mm FR air bubble / bonding / 18 µm pure aluminium foil + reinforcing net (eight layers) |
| Outer face | 99% pure aluminium foil, both faces |
| Thickness | 9 to 10 mm |
| Roll size | 1.20 / 1.35 m x 10 / 20 / 30 m (12 to 36 m² per roll) |
| Reinforcement | Bi-directional net, bonded to foil |
| Radiant heat reflectivity | 98% |
| Core thermal resistance (product alone) | R 0.23 m²K/W |
| High thermal equivalent | R 4.43 m²K/W* |
| Fire classification (BS 476 Part 6) | Class 0 |
| Fire classification (BS 476 Part 7) | Class 1 |
| Fire performance | BS 476 Class 1 / Class 0 · AS/NZS 1530.2 & 1530.3 |
*Heat flow down, 2 x 75 mm air gaps, ε 0.02 to 0.03.
Thermal performance: R-value by assembly
Reflective insulation works best when installed next to an air gap. The total system R-value depends on how many reflective air cavities are created in the roof, ceiling or wall.
| Assembly / air cavity | Winter (heat flow up) | Summer (heat flow down) |
|---|---|---|
| Roof / ceiling, one 25 mm reflective cavity | R 0.72 | R 1.12 |
| Roof / ceiling, two 25 mm reflective cavities | R 1.21 | R 2.01 |
| Wall assembly, 38 mm cavity, horizontal heat flow | R 0.97 (one cavity) / R 1.71 (two cavities) | |
Values are total system R in m²K/W. Cavity resistance calculated to BS EN ISO 6946 (ref. BS EN 16012) for an unventilated cavity with a low-emissivity surface (ε 0.02 to 0.03). Core product R 0.23 m²K/W applies to the product alone without a reflective air cavity.
Applications
- Roof underlay and metal roofing, over the purlins or under the rafters
- Ceilings and attic spaces
- Walls and partitions
- Warehouses, factories and metal buildings
- Residential and commercial buildings
- New build and renovation projects
How to install Multi+ 10mm on a roof or ceiling
- Measure the roof or ceiling area and work out the number of rolls needed for the total m².
- Set the purlins or rafters to the correct spacing.
- Lay Multi+ over the purlins or under the rafters, with the foil face toward the heat source.
- Fix with screws and cut to length, keeping the sheet taut.
- Seal all joints and overlaps with aluminium foil tape.
Air gap tip: keep a 20 to 90 mm air gap on the reflective face for best performance, and maintain at least 75 mm clearance from downlights.
Testing and certification
Multi+ 10mm is tested to BS 476 Part 6 & 7 (Class 0 / Class 1), AS/NZS 1530.2 & 1530.3, ASTM C 1371, ISO 8301 / ASTM C 518 and BS EN ISO 6946. Test reports and certificates are available on request.
Frequently asked questions
What is Multi+ 10mm used for?
It is a multi-layer reflective insulation for roofs, ceilings and walls, used in warehouses, factories, homes and commercial buildings where a thermal break, vapour barrier and radiant barrier are needed in one sheet.
What is IXPE foam?
IXPE is irradiation cross-linked polyethylene foam. In Multi+ it sits between two FR air-bubble layers and acts as a thermal break.
Is Multi+ 10mm fire rated?
Yes. It is classified Class 0 under BS 476 Part 6 and Class 1 under BS 476 Part 7, and tested to AS/NZS 1530.2 and 1530.3.
What is the R-value of Multi+ 10mm?
The product alone has a core thermal resistance of R 0.23 m²K/W. With reflective air cavities, total system R-values reach up to R 2.01 m²K/W in a roof with two 25 mm cavities (heat flow down), and a high thermal equivalent of R 4.43 m²K/W with two 75 mm air gaps.
What roll sizes are available?
Rolls come in 1.20 m and 1.35 m widths, in 10, 20 and 30 m lengths, covering 12 to 36 m² per roll.
Do I need an air gap when installing?
Yes. Maintain a 20 to 90 mm air gap on the reflective face, and at least 75 mm clearance from downlights.
Get a quote for Multi+ 10mm
Alumix Insulation Global manufactures reflective foil insulation, radiant barriers and vapour barriers for residential, commercial and industrial projects. Contact our team for pricing, bulk orders, technical data or test certificates, or email info@alumixinsulationglobal.com.
Values shown are subject to verification against current test reports. Thermal performance may vary with installation method, air gap and environmental conditions. Specifications subject to change without prior notice.
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