Welcome to Insulation4less, where we offer an extensive range of foil tapes designed to meet your every insulation need. Our collection, featuring top-notch products, ensures that you have access to some of the finest insulation tape solutions in the market. Here’s an overview of the various types of foil tapes available in our catalogue, their practical applications, and a brief guide to help you choose the right product for your project.

What foil tape does in an insulation build-up

A foil-faced insulation board or multifoil layer only forms a continuous sealed layer when its joints, overlaps, cuts and local repairs are treated correctly. Aluminium-faced tape is used to bridge those breaks. On suitable systems it can help maintain airtightness and vapour-control continuity, while also giving a compatible foil finish across the joint.

The tape itself is not a substitute for insulation. It does not add a meaningful board-style thermal resistance to a wall, roof or floor. Its job is sealing. The correct tape therefore depends on the substrate, the system manufacturer’s installation instructions, the width of the joint and the conditions during application.

Foil tape sizes and verified specifications

Which foil tape do I need?

Start with the insulation or membrane manufacturer rather than choosing by price alone. If the manufacturer specifies a proprietary tape, use that tape or another product the manufacturer explicitly accepts. This matters where the taped joint forms part of the declared airtightness, vapour-control or fire-performance arrangement.

50mm, 75mm or 100mm: how to choose the width

For a straight, tight joint between clean foil-faced boards, a narrower tape can be practical because there is little gap to bridge. Wider tape gives a larger adhesive contact area and is useful where the joint is less regular, where a lap must be sealed, or where the system manufacturer calls for a specific width.

Do not assume that the narrowest roll is acceptable just because it covers the visible joint. The tape needs sound contact with the facing on both sides. For SuperFOIL multifoil installations, the manufacturer specifically recommends 100mm-wide foil tape for a consistent airtight seal.

General Foil Tapes

Foil tapes are typically utilised for their resistance to heat, humidity, and other environmental factors, making them an excellent choice for sealing joints and seams in ducting systems, insulation materials, and more.

• Foil Tape - All Sizes and Aluminium Foil Tape - All Sizes are versatile products offering a plethora of sizes, catering to both small-scale residential and large-scale industrial applications.
• Single Sided DPM Jointing Tape - All Sizes is another versatile option to consider, especially for damp proofing applications, ensuring that you have a robust moisture barrier in place.

SuperFOIL Tape Selections

SuperFOIL, a notable vendor, provides a selection of foil tapes each constructed with specific purposes in mind.

• Versatile Range:
  • SuperFOIL Superior Foil Tape is renowned for its excellent adhesion and robustness, making it a preferred choice for numerous insulation tasks, from securing joints and seams to dealing with minor repairs.
  • SuperFOIL Standard Foil Tape 100mm x 20m offers a standardised size that could cater to routine insulation and ductwork repairs or installations.

Profoil and Specialized Foil Tapes

For those seeking reflective qualities or specialised features in their tape, our Profoil and specialised tapes might be the perfect fit.

• Reflective and High-Quality:
  • Profoil Aluminium Reflective Foil Tape - 100mm x 45m Roll from PROCTOR is noted for its reflective properties, offering additional thermal performance while ensuring seams and joints are firmly sealed.
• Double-Sided Solutions:
  • Double Sided Butyl Mastic Tape offers a stellar bonding solution, especially for surfaces that demand a strong, lasting adhesive, making it an apt choice for various sealing and bonding applications.

How to apply aluminium foil tape

Good adhesion starts with preparation. Bring the two foil faces into the position required by the insulation system. Remove dust, loose material, oil and moisture. Apply the tape without stretching it, centre it over the joint and press it firmly onto both faces. Work along the tape to remove creases and trapped air.

At corners, penetrations and repairs, use enough tape to maintain an unbroken seal. Small pieces patched over one another can create weak points, so use a wider strip where it gives a cleaner detail. If a surface is wet, frozen, dusty or contaminated, stop and prepare it properly rather than relying on extra pressure.

How much tape should I order?

Measure the total linear metres of board joints, membrane laps and perimeter details that actually need taping. Add the lengths around penetrations and repairs, then allow for cuts and site wastage. Roll length matters more than floor or wall area: a 45m roll seals up to 45 linear metres only when there are no overlaps, offcuts or wasted sections.

For repetitive board work, sketch the board layout before ordering. This gives a better estimate than trying to convert square metres directly into rolls. Keep a spare roll available where airtightness or vapour-control continuity must be completed before the lining closes the build-up.

Frequently asked questions

What is foil tape used for?

Aluminium-faced tape is used to seal joints, overlaps, cuts and local repairs in compatible foil-faced insulation and vapour-control systems. It can help maintain continuity across the foil layer and reduce unwanted air or vapour movement where the system is designed for taped joints. It is a sealing accessory, not insulation by itself.

Can foil tape be used on PIR insulation boards?

Foil tape can be used on foil-faced PIR board joints where the board manufacturer or project specification requires a taped foil layer. Apply it to clean, dry and sound facings with enough width to bond securely on both sides. Check the insulation manufacturer’s installation instructions before treating the taped facing as an airtight or vapour-control layer.

Is foil tape waterproof?

Some aluminium foil tapes are described by their manufacturers as water resistant or waterproof, but that does not make every taped construction permanently waterproof. Performance depends on the adhesive, substrate, joint design and exposure. Use a tape specifically approved for the membrane or insulation system where the joint forms part of a weatherproofing detail.

What width foil tape should I use?

The required width depends on the system and joint. The live Insulation4Less range includes 50mm, 75mm and 100mm options. Wider tape gives more bonding area around irregular joints and laps. SuperFOIL specifically recommends 100mm-wide foil tape for sealing its multifoil products, so follow the insulation manufacturer where a width is stated.

Can foil tape create a vapour barrier?

Foil tape can seal joints in a compatible vapour-control layer, helping maintain continuity across overlaps, seams and penetrations. The complete layer, not the tape alone, provides the vapour-control function. Use the membrane or insulation manufacturer’s specified tape and detailing, particularly around edges, services and junctions where discontinuities can allow vapour movement.

Can I use ordinary duct tape instead of foil tape?

Ordinary cloth or polyethylene duct tape should not automatically replace a specified aluminium foil tape. Adhesive performance, vapour resistance, temperature resistance, ageing and compatibility can differ. Where a foil-faced insulation or vapour-control system requires taped joints, use the tape specified by the manufacturer or a technically accepted equivalent for that exact application.

Does foil tape add insulation?

Foil tape is primarily a sealing product and should not be treated as a layer of thermal insulation. Its purpose is to close joints and maintain continuity in compatible foil-faced systems. Thermal resistance in m²K/W should be taken from the insulation product and complete build-up data, not assigned to a strip of jointing tape.

How do I get foil tape to stick properly?

Apply tape to a clean, dry, firm surface free from dust, grease and loose material. Centre it over the joint and press it firmly along the full width, avoiding wrinkles and trapped air. Temperature also matters: for example, Proctor Reflectafoil Tape specifies an application range of +10°C to +40°C and requires a moisture-free surface.

Can foil tape be used outdoors?

Outdoor suitability must be checked against the exact product and system. UV exposure, rain, temperature cycling and the substrate can affect long-term adhesion. A product described as UV resistant may still have installation limitations. For exposed facade or membrane work, use the specialist tape specified for that external system rather than assuming general foil tape is suitable.

What is the difference between foil tape and butyl tape?

Foil tape normally has an aluminium face with a pressure-sensitive adhesive and is used over foil-faced joints. Butyl tape is a tacky sealing material commonly used between overlapping membranes or construction layers, often as a compressed seal. They perform different detailing jobs, so use the tape type specified for the membrane or insulation system.

How many metres are on a roll of foil tape?

Roll length varies by product. The live Insulation4Less collection includes 20m SuperFOIL rolls and 45m rolls in several aluminium foil tape ranges. Calculate requirements from the total linear metres of joints and details, then allow extra for overlaps, cuts, corners and repairs rather than assuming one roll covers a fixed square-metre area.