Multi Foil Insulation

Choosing Multi Foil Insulation for Your Project

At County Building Supplies, we supply multi foil insulation for professional builders, roofers, contractors, self-builders and DIY customers. Multi foil insulation is a flexible, layered insulation material used in suitable roof and building applications to help reduce heat transfer and improve thermal performance.

Our range includes YBS SuperQuilt Trade 19 Layer Foil Roof Insulation, supplied in a 1.5m x 10m roll.

How Does Multi Foil Insulation Work?

Multi foil insulation combines layers of reflective foil with other insulating materials. Reflective surfaces help reduce radiant heat transfer when installed facing suitable air spaces, while the remaining layers contribute to the insulation system's thermal performance.

Unlike conventional insulation materials, the performance of a multi foil system can depend significantly on the installation method and adjacent air gaps.

Multi Foil Insulation vs PIR Insulation Boards

Multi foil and PIR insulation are both used in suitable building applications, but they have different characteristics.

• Multi foil insulation: Flexible and supplied in rolls, making it useful for certain roof and rafter installations. Its thermal performance depends on the specified installation system, including required air spaces.
• PIR insulation boards: Rigid boards with high thermal resistance relative to their thickness, commonly used in suitable roof, wall and floor constructions.

When comparing products, use the manufacturer's declared thermal performance for the intended installation rather than comparing material thickness alone.

Installing Multi Foil Roof Insulation

Correct installation is essential for achieving the intended performance of reflective insulation.

Follow the manufacturer's instructions for fixing, overlaps, joint sealing and any required air gaps. Roof ventilation, condensation control and the position of vapour control layers must also be considered as part of the complete roof design.

Do not assume that multi foil insulation alone will achieve the required U-value or meet Building Regulations without checking the full construction specification.

How Much Multi Foil Insulation Do You Need?

Measure the total area requiring insulation in square metres. County's YBS SuperQuilt Trade roll measures 1.5m x 10m, providing a nominal roll area of 15m² before allowing for overlaps and cutting waste.

For example, a roof area measuring 6m x 5m covers 30m². This represents two rolls by nominal area, but additional material will normally be required for overlaps, cutting and installation details.

Check the manufacturer's installation guidance when calculating the final quantity.

Need Advice?

Not sure whether multi foil insulation is suitable for your project? Visit your local County Building Supplies branch or contact our team for product information, quantities and availability.