SuperFOIL SF19BB Breathable Multi-Layered Foil Insulation – 10m x 1.5m

SuperFOIL SF19BB Breathable Multi-Layered Foil Insulation is a high-performance breathable multifoil insulation designed to combine thermal insulation and a breathable membrane within a single product. Ideal for roofing and external cladding applications, SF19BB can replace separate insulation and breather membrane layers in suitable constructions, helping reduce installation time, labour and material requirements.

The outer layer incorporates a reflective breathable membrane that acts as a secondary rain barrier while allowing water vapour to escape. The insulation layers beneath are perforated to maintain breathability throughout the complete product without sacrificing its thermal performance.

SuperFOIL SF19BB provides a stated core thermal resistance of 1.454 m²K/W, very low water vapour resistance of 0.115 MNs/g and W1 resistance to water penetration. Its reflective surfaces also provide radiant barrier properties, helping reduce radiant heat transfer throughout the year.

Each roll measures 1.5m x 10m, providing 15m² of coverage at a nominal thickness of 40mm.

What is SuperFOIL SF19BB Used For?

SuperFOIL SF19BB is designed for applications requiring both thermal insulation and a breathable external membrane.

Typical applications include:

• Pitched roof insulation
• Roofing projects
• External cladding systems
• Timber frame construction
• New-build properties
• Extensions
• Loft conversions
• Renovation projects
• Refurbishment projects
• Retrofit insulation
• Hybrid insulation systems
• Residential construction
• Suitable commercial applications

Its combined insulation and breather membrane functionality makes SF19BB particularly useful for simplifying roof and external wall build-ups.

2-in-1 Breather Membrane and Insulation

SuperFOIL SF19BB combines two important functions within a single product:

1. Thermal insulation
2. Breather membrane

In suitable applications, this removes the need to install separate insulation and breathable membrane layers.

Combining these functions can provide several practical benefits, including:

• Reduced installation time
• Fewer individual materials required
• Reduced labour
• Simplified roof and wall build-ups
• Less material handling
• Fewer separate installation stages
• Potential cost savings
• Minimal material waste

This makes SF19BB a practical alternative to installing conventional insulation and a separate breather membrane.

Breathable Multifoil Construction

SuperFOIL SF19BB has been specifically designed as a breathable multifoil insulation.

A reflective breathable membrane forms the outer layer of the product, while the insulation layers beneath are perforated.

These perforations allow water vapour to move through the complete insulation layer rather than becoming trapped between individual layers.

The result is a multifoil insulation that combines useful thermal resistance with the vapour permeability required towards the breathable side of an appropriately designed roof or wall construction.

1.454 m²K/W Core Thermal Resistance

SuperFOIL SF19BB provides a stated core thermal resistance of 1.454 m²K/W.

This allows the 40mm thick insulation to contribute significantly towards the overall thermal performance of a roof or wall.

The complete thermal performance of a construction will depend on factors including:

• Other insulation materials
• Adjacent airspaces
• Rafters or structural members
• Internal finishes
• External finishes
• Installation configuration
• Thermal bridging
• Overall building element design

The final U-value should therefore be calculated using the complete roof or wall construction rather than the SF19BB core R-value alone.

Highly Breathable with 0.115 MNs/g Vapour Resistance

SuperFOIL SF19BB provides a very low stated water vapour resistance of 0.115 MNs/g.

This allows water vapour to pass readily through the insulation and escape towards the exterior of an appropriately designed construction.

This is particularly important towards the external side of roofs and walls, where moisture that enters the building fabric needs an effective route to escape.

Helps Reduce the Risk of Condensation

Water vapour generated within an occupied building can migrate into insulated roofs and walls.

If moisture reaches colder parts of the construction and cannot escape, it can potentially condense within the building fabric.

The highly breathable nature of SuperFOIL SF19BB allows water vapour to pass through the insulation towards the exterior.

When incorporated into an appropriately designed building envelope, this helps reduce the risk of moisture accumulating within the insulation and surrounding materials.

Reflective Breathable Outer Membrane

The external surface of SuperFOIL SF19BB incorporates a reflective breathable membrane.

This provides several functions within a single layer:

• Breathable membrane
• Secondary rain barrier
• Reflective surface
• Radiant barrier
• Protective outer membrane

This combination allows SF19BB to provide both thermal and moisture-management functions within suitable roofing and external cladding applications.

W1 Resistance to Water Penetration

SuperFOIL SF19BB achieves a stated W1 resistance to water penetration.

This provides a high level of resistance to external water passing through the breathable membrane while still allowing water vapour to escape.

The combination of:

0.115 MNs/g water vapour resistance + W1 water resistance

allows SF19BB to provide a useful balance between external weather protection and internal moisture release.

Secondary Rain Barrier

The breathable outer membrane of SuperFOIL SF19BB can act as a secondary rain barrier within appropriate roofing and external wall constructions.

If moisture passes beyond the primary roof covering or external cladding, the W1 membrane provides an additional layer of protection for the insulation and underlying building structure.

The primary roof covering or external cladding should still provide the principal weatherproof layer of the building envelope.

Reflective Radiant Barrier

In addition to its core insulation performance, SuperFOIL SF19BB incorporates reflective surfaces that provide radiant barrier properties.

When reflective surfaces face appropriate airspaces, they help reduce heat transfer through thermal radiation.

This allows SF19BB to complement its core thermal resistance with additional reflective thermal performance within appropriately designed constructions.

Helps Keep Buildings Warmer in Winter

During colder weather, SuperFOIL SF19BB helps reduce heat transfer through its multi-layer insulation construction.

Its reflective surfaces can also help reduce radiant heat transfer where appropriate airspaces are incorporated into the roof or wall build-up.

This contributes towards reducing heat loss and maintaining a warmer internal environment.

Helps Keep Buildings Cooler in Summer

The radiant barrier properties of SF19BB can also provide useful benefits during warmer conditions.

Reflective surfaces help reduce radiant heat transfer and can contribute towards reducing unwanted solar heat gain through suitable roof and external wall constructions.

SF19BB therefore provides useful year-round thermal performance, helping buildings remain warmer during winter and cooler during summer.

Ideal for Pitched Roof Insulation

SuperFOIL SF19BB is particularly suited to pitched roof applications because it combines thermal insulation with the breathable membrane normally required towards the external side of the construction.

Potential applications include:

• New-build pitched roofs
• Loft conversions
• Extensions
• Roof refurbishments
• Renovation projects
• Retrofit insulation upgrades
• Hybrid roof insulation systems

Using a combined product can simplify the roof build-up and reduce the number of separate installation stages.

Ideal for External Cladding

SF19BB can also be incorporated into appropriate external cladding and wall systems.

Its breathable construction allows moisture vapour to escape, while the W1 outer membrane provides resistance to external water penetration.

This makes the product particularly useful where both insulation and a breathable secondary weather-resistant membrane are required behind suitable external cladding.

40mm Thick Insulation

SuperFOIL SF19BB has a nominal thickness of 40mm.

Within this relatively compact construction, the product combines:

• 1.454 m²K/W core thermal resistance
• Breathable insulation
• Reflective radiant barrier properties
• Integrated breather membrane
• W1 resistance to water penetration

This can make SF19BB particularly useful where construction depth is limited or where a combined insulation and membrane solution is preferred.

Can Be Combined with Other Insulation

SuperFOIL SF19BB can be incorporated into hybrid insulation systems alongside other suitable insulation materials.

Potential combinations can include suitable:

• Rigid insulation boards
• Mineral wool
• Glass wool
• Other breathable insulation products
• Other compatible insulation systems

This allows the thermal performance of SF19BB to complement other insulation products to achieve the target U-value for the complete building element.

Can Be Used in Multiple Layers

Where appropriate to the construction design, SuperFOIL SF19BB can also be incorporated into multi-layer insulation systems.

Using multifoil insulation in this way provides additional flexibility when designing roofs and walls to achieve particular thermal targets.

The moisture-management characteristics of the complete construction should always be considered when combining multiple insulation and membrane layers.

Contributes Towards Airtightness

A continuous multifoil installation can help reduce unwanted air movement through the building envelope.

Reducing air leakage can contribute towards improved energy efficiency by limiting heat loss associated with uncontrolled draughts and convection currents.

The breathable nature of SF19BB relates to water vapour diffusion and does not mean that uncontrolled air movement is required through the construction.

Correct installation and detailing remain important for achieving the intended performance of the complete building envelope.

Strong and Durable Construction

SuperFOIL SF19BB provides good mechanical properties for normal handling and installation.

Its stated tensile properties are:

• Length: 238 / 227 N/50mm
• Width: 111 / 100 N/50mm

Its stated resistance to tearing is:

• Length: 179N
• Width: 179N

The stated elongation properties are:

• Length: 61 / 57%
• Width: 92 / 87%

These characteristics provide useful durability and flexibility when installing the product across roofs and external wall constructions.

Flexible Down to -40°C

SuperFOIL SF19BB provides stated low-temperature flexibility down to -40°C.

This allows the product to maintain flexibility across a wide range of temperatures, contributing towards ease of handling and durability in suitable building-envelope applications.

Manufactured Using 40% Recycled Materials

SuperFOIL SF19BB is manufactured using approximately 40% recycled materials.

This combines recycled material content with the thermal, breathable and reflective characteristics required from a high-performance multifoil insulation system.

15m² Coverage Per Roll

Each SuperFOIL SF19BB roll measures:

1.5m wide x 10m long

providing a total nominal coverage of:

15m² per roll

The product has a nominal thickness of 40mm and each roll weighs approximately 10kg.

The 1.5m width provides substantial coverage with each run while the flexible roll format helps minimise unnecessary cutting and material waste.

Independently Tested Performance

SuperFOIL insulation products are independently tested by third-party certified laboratories and notified bodies to establish their performance characteristics.

The manufacturer states that SuperFOIL insulation is tested for use as part of constructions designed to meet relevant UK Building Regulations and applicable UK and European requirements, including CE requirements.

Thermal performance is assessed using recognised methods applicable to insulation products, including those referenced within BR443 and Part L.

The suitability of SF19BB and the complete construction should be assessed against the specific thermal, moisture, structural, fire and regulatory requirements of each project.

Key Features and Benefits

• Breathable multifoil insulation: Combines thermal insulation and breathability
• 2-in-1 construction: Breather membrane and insulation layer within one product
• 1.454 m²K/W core R-value: Provides useful thermal resistance
• 0.115 MNs/g vapour resistance: Highly permeable to water vapour
• Helps reduce condensation risk: Allows moisture vapour to escape through the construction
• W1 water resistance: Provides excellent resistance to water penetration
• Secondary rain barrier: Helps protect the underlying roof or wall construction
• Reflective outer membrane: Combines breathability with radiant barrier properties
• Radiant barrier: Helps reduce radiant heat transfer
• Winter performance: Helps reduce heat loss
• Summer performance: Helps reduce radiant heat gain
• Ideal for pitched roofs: Combines two commonly required roof layers
• Ideal for external cladding: Suitable for appropriate external wall systems
• New-build applications: Suitable for appropriate new construction
• Extension projects: Simplifies insulation build-ups
• Renovation applications: Suitable for refurbishment and thermal upgrades
• Hybrid insulation compatible: Can be combined with other suitable insulation
• Multiple-layer applications: Can form part of appropriately designed multi-layer systems
• 40mm thick: Space-efficient multi-layer construction
• 15m² coverage: Each 1.5m x 10m roll covers 15m²
• 10kg roll weight: Lightweight and straightforward to handle
• Strong construction: Good tensile and tear resistance
• Low-temperature flexibility: Flexible down to -40°C
• 40% recycled materials: Manufactured using recycled content
• Reduced installation stages: Can eliminate a separate breather membrane installation in suitable constructions
• Minimal waste: Flexible roll format enables efficient cutting and installation
• Independently tested: Performance assessed by third-party laboratories and notified bodies

SuperFOIL SF19BB Breathable Multi-Layered Foil Insulation Specification

Why Choose SuperFOIL SF19BB Breathable Multi-Layered Foil Insulation?

SuperFOIL SF19BB Breathable Multi-Layered Foil Insulation provides a practical 2-in-1 insulation and breather membrane solution for suitable roofing and external cladding projects.

Its stated 1.454 m²K/W core thermal resistance provides useful insulation performance within a nominal 40mm thickness, while its very low 0.115 MNs/g water vapour resistance allows moisture vapour to pass readily through the complete product.

At the same time, W1 resistance to water penetration allows the breathable outer membrane to act as a secondary rain barrier, providing additional protection to the underlying roof or wall construction.

By combining insulation and a breathable membrane into one product, SF19BB can reduce the number of separate materials and installation stages required. Its reflective surfaces also provide radiant barrier performance, helping reduce heat loss during colder conditions and radiant heat gain during warmer weather.

With 15m² coverage per 1.5m x 10m roll, approximately 40% recycled material content and CE-certified performance as a breathable membrane and water barrier, SuperFOIL SF19BB provides a versatile solution for projects requiring breathable multifoil insulation, reflective roof insulation or combined insulation and breather membrane performance.