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SuperFOIL  |  SKU: SFTV1550

SuperFOIL SFTV Thermal Vapour Barrier (VCL) - 1.5m x 50m - 75m²


£104.79 Ex VAT
£125.75 Inc VAT
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A 2-in-1 Vapour Control Layer (VCL) and Radiant Barrier, the SuperFOIL SFTV is a Vapour Control Layer with a reflective finish that is designed to insulate heat from inside your property, and minimise overheating in warmer months as well as providing a barrier that reduces the transfer of moisture within the wall structure. 

Typically used on the “warm” (interior) side in wall structures, with an airtight seal. 

  • Achieves an R Value of 0.95 in Roofs, 1.42 in Walls and 2.80 in Floors
  • Ideal for New Builds, Extensions and retrofits
  • Simple installation with basic tools and supplies
  • Functions as both a VCL and Radiant Barrier

What is a Vapour Control Layer (VCL)? 

A vapour control layer (VCL), also known as a vapour barrier, is a material used in building construction to prevent the passage of water vapour through walls, ceilings, floors, or roofs. It is typically installed on the “warm” side of the insulation (typically the interior side) where it helps to control moisture levels within the building envelope. By blocking the movement of water vapour, a VCL helps to prevent condensation from occurring within the building structure, which can lead to issues such as mould growth, rot, and reduced insulation effectiveness.

What is a Radiant Barrier?

A radiant barrier is a type of material designed to reduce radiant heat transfer. Radiant barriers work by reflecting radiant heat away from the surface they cover, which helps to keep spaces cooler in the summer and warmer in the winter. They are often installed in attics, under roofs, or in walls where they can block the transfer of radiant heat from the sun or from indoor heating systems. By minimising radiant heat transfer, radiant barriers can help improve energy efficiency and increase comfort levels within buildings.

How to install SuperFOIL SFTV?

A vapour control layer should be applied on the interior side of any wall, roof or flooring, over timber studs before the internal lining. It should be 100% sealed to the structure with double-sided butyl tapes, pre-applied to all areas where a fixing is to be made, and finished with metallised tapes to ensure a complete vapour seal.

Data Sheets & Guides:

SuperFoil Under Rafter Installation Guide

SuperFoil Over Rafter Installation Guide

Super Foil External Wall Installation Guide

SuperFoil SFTV Data Sheet

Large Order or Specific Requirement?

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0115 6976 800

  • Size
    1500mm x 50m
  • Coverage (m²)
    75
  • Thickness
    1mm
  • Length
    50m
  • Width
    1.5m
  • Material
    Metallised Heavy Duty Polypropylene
  • Finish
    Metallised Polyester
  • Estimated Lifespan
    50+ Years
  • Thermal Resistance
    R Value: 0.95 - 2.80
  • Water Resistance
    1200MNs/g
  • Reaction to Fire
    Euroclass E

Frequently Asked Questions

Types of Insulation

There is a vast array of insulation suitable for all types of uses in home and commercial construction projects, though some of the most common types are loft insulation, cavity wall insulation and floor insulation, as well as PIR insulation board which can be used for a variety of different purposes.

Loft Insulation

Loft roll, also known as loft insulation roll or loft insulation blanket, is a type of insulation material typically made from mineral wool, fiberglass, or recycled polyester fibres. It comes in rolls of varying widths and thicknesses and is designed to be laid between the joists or rafters in the loft space of a building to prevent heat loss. Our most popular Loft Rolls are made of glass mineral wool, which is designed to be more breathable and easier to handle and install, and are manufactured by Knauf and Isover.

Acoustic Roll

Acoustic roll, also known as sound insulation roll or acoustic insulation blanket, is a type of insulation material designed to reduce the transmission of airborne noise between rooms or floors in a building. Typically made from materials such as mineral wool, fiberglass, or recycled polyester fibres, acoustic roll comes in rolls of varying thicknesses and densities. To install acoustic roll, simply roll it out evenly between the joists or studs in walls, floors, or ceilings, ensuring it fits snugly without any gaps. Our most popular acoustic roll is manufactured by Knauf and Isover, and are made from a glass mineral wool.

Cavity Wall / Slab Insulation

Cavity insulation refers to the process of insulating the gap or "cavity" in homes or buildings with cavity walls, which consist of two layers of masonry (such as brick) with a hollow space in between. Cavity insulation materials, such as mineral wool or foam boards, are inserted into this void to reduce heat transfer through the walls.

Our most popular types of Cavity wall insulation are Knauf Dritherm, Isover Cavity Wall Slab and Celotex Thermaclass.

PIR Board Insulation

Polyisocyanurate (PIR) insulation is a type of rigid foam insulation material known for its excellent thermal performance and fire resistance properties. PIR insulation is commonly used in a variety of building applications, including roofs, walls, floors, and ceilings. Its high thermal resistance, light weight and relatively thin profile make it particularly well-suited for areas where space is limited. Our two most common PIR Boards are Celotex PIR Boards, and Recticel PIR Boards.

Floor Insulation

Common materials used for floor insulation include rigid foam boards (PIR), mineral wool or EPS (Expanded Polystyrene). Floor insulation is particularly important in buildings with suspended floors or over unheated spaces such as cellars crawl spaces, or garages. Our most popular floor insulation is PIR board, which has a variety of different uses, although we also offer a more basic EPS board.

Roof Insulation

Roof insulation and loft insulation serve similar purposes but are applied in different areas of a building. Roof insulation refers to the insulation installed within the roof structure itself, typically between the rafters or on top of the roof deck, aiming to prevent heat loss through the roof and maintain a comfortable indoor temperature. This type of insulation is particularly important in pitched or sloped roofs where space between the rafters is limited. Our PIR Insulation Board is well suited to this purpose as it is light weight and easily cut to size, with very effective insulating properties.

Mineral Wool vs Fibreglass Insulation

Mineral wool and fiberglass are two common types of insulation materials with distinct characteristics. Mineral wool, made from natural rock or recycled slag, offers excellent fire resistance and sound absorption properties, making it ideal for both thermal and acoustic insulation. It is denser and heavier than fiberglass, providing better resistance to compression over time. Fiberglass insulation, made from fine glass fibres, is lightweight, flexible, and typically less expensive than mineral wool. It also offers good thermal insulation properties and is commonly used in residential and commercial buildings. While both materials effectively reduce heat transfer, mineral wool tends to be preferred in applications.

What is Glass Mineral Wool Insulation

Glass mineral wool, also known as fiberglass insulation, is a type of insulation material made from fine strands of glass fibres bonded together. These fibres are often arranged in a mat-like structure, providing excellent thermal insulation properties by trapping pockets of air within its structure. Glass mineral wool insulation is widely used in residential and commercial buildings to improve energy efficiency, reduce heat loss, and enhance acoustic performance. It is available in various forms such as rolls, batts, and loose-fill, making it versatile for different applications including walls, ceilings, floors, and roofs. Additionally, glass mineral wool is non-combustible, resistant to moisture, and generally safe to handle, though proper protective gear should be worn during installation due to its potential for skin irritation and respiratory issues if fibers are released into the air.

How to Calculate U Value

The U-value (thermal transmittance) of a building component such as a wall, roof, or window, measures its thermal conductivity or how easily heat can pass through it. The lower the U-value, the better the insulation. To calculate the U-value, you typically need to consider several factors, including the materials used, their thicknesses, and any air gaps. A general formula for calculating the U-value:

U = 1 over R

Where:

  • U = U Value
  • R = The total thermal resistance of the building component, including all layers of materials and air gaps.