Order Helpline 01752 692 206

Multi-layer Foil Insulation SF40 by SuperFOIL - 1.5m x 10m Roll

Product Code:
Est. Delivery: 2-3 Working Days
Shipping costs displayed in basket.
We can let you know when this product is back in stock.

This product is proving to be very popular and has unfortunately sold out.

Enter your email below and we'll notify you as soon as this product is back in stock:

Subject to stock availability, if products on a 24 hours service are ordered alongside products NOT on a 24 hours service, this may delay your whole order.

View Transport Policy

All delivery charges are included in the final shopping basket and are dependent on the products Scottish Highlands & the Islands where additional shipping charges will apply.

Please note that not all products will incur an additional delivery charge to the Scottish Highlands & the Islands – this is based on the costs from the manufacturer, distributor or courier providing shipping on our behalf. If your delivery address is in the Scottish Highlands and Islands, a member of our helpline team will contact you prior to processing your order should an additional delivery charge apply.

While we make every effort to ensure orders are delivered by the date required, we cannot guarantee availability from the manufacturer or the manufacturer's delivery schedules.

Any variation to web delivery date given will be advised to you by email or telephone. If we are unable to make delivery because access is not possible, we reserve the right to make a failed delivery charge.

£246.62 Incl. VAT
Oops! Please select from the options
Request U-Value Calculation


SF40 is Superfoil‘s extra performance multifoil insulation. Extremely cost effective with a 68% increase in performance over our standard multifoil. SF40 beats any multifoil competitor products R value.

With a mission to build a better multi foil insulation SF40 combines the technical innovation of 37 layers and is configured for maximum efficiency, achieving higher values than previously thought possible within the industry. The enhanced thickness combined with radiant reflective properties and air barrier properties provide benefits over traditional (non reflective) open face insulation like glass fibre. SF40 includes CE certified vapor and water barrier outer layers.

SuperFOIL SF40 maximises roof and wall insulation with efficient use of space. SuperFOIL also has the strongest multi foil material aiding installation and reducing waste. LABC registered detail makes Building Regulations simple.

Please note we would recommend using 30mm staples with the SF40.


Length: 10m.
Width: 1.5m.
Roll size: 15m2.
Thickness installed: 65mm.
Weight per roll: 18.5kg.
Thermal Resistance - rValues:
For pitched roofs: 3.58 m2K/W.
For walls: 4.04 m2K/W.
For flat roofs: 3.58 m2K/W.
For floors: 5.69 m2K/W.
Polypropylene reinforced heavy outer laminated foil: 2x layers.
Aluminium coated reflective foil PET layers: 12x layers.
Thermal foam separation layers: 16x layers.
Loft quilt: 6x layers.
Total layers: 37x layers.


Air seal & radiant barrier.
Building regs compliant.
Horizontal or vertical fitting.
25mm air gap required.
Cut with knife or scissors.


Length 10m Thickness 60mm Width 1500mm


Facing Foil Application Internal Walls Product Type Roll Material Multifoil
Coverage 15m2 Range SuperFoil

Questions & Answers


Does this have an integral breather membrane?


This product doesn't have an integral breather membrane but we do offer one that does - https://www.insulationsuperstore.co.uk/product/superfoil-sf40bb-breathable-multifoil-insulation-roll-15m-x-10m.html


Can superfoil be used to insulate a large hot water tankused for a heat store ?


To help answer your query, you could use something like the SUPERFOIL SF40 to wrap around the hot water tank. This product in particualr can withstand direct contact up to 70°C, and it could be furhter increased by introducing a layer of ply between them. 


Can this be used with a combination of insulation between rafters such as Kingspan or Celotex?


Yes you can use Celotex between the rafters, and the typical method of installation for the SF40 would be under the rafters and can be stapled direct.


What tape should be used with SuperFOIL SF40?


To ensure a consistant air-tight seal, 100mm wide foil tape should be used. We recommend SuperFOIL Superior Tape for it's high strength and enhanced adhesive which allows it to be used even in cold weather.


What size Staples do I need to fix SuperFOIL SF40?


We recommend using a minimum 30mm staples for use with SuperFOIL SF40. The staples should be adequate size to hold the SuperFOIL in place until your battens are fitted forming the permanent fixing.


What size Battens should I use with SuperFOIL SF40?


Minimum of 50mm depth battens to allow the material to expand fully and maintain the required airspace for full thermal performance.

Have a question about this product?


4 / 5 1 reviews
Mickey Sims
22nd May 2020
Brilliant technology, easy to install, a team of two is best option. Awaiting winter re insulation results but can already see/ feel the difference in the rooms where Sf40 has been applied. Its expensive in terms of regular insulation but is cleaner, easier to handle and requires less space with improved insulation results. If you follow the guidlines when fitting in roof rafters including celotex vapour layer and two air gaps, it should provide superior insulative properties. Tools required: An electric stapler is a must have, dont even think about using a hand stapler unless your superman. The only issue is cutting the material. Due to its multi layered design this is not easy. Dont be fooled by the sharp knife/sissors demos, you really need an electric sharp bladed tool particulaly if your job is a large one. Mine was 60 sqmtrs. These can be expensive for a one off job, can you hire one? Anyway to summerise a great product which is a one time fit given many years of superior insulation.
Sorry, there was a problem loading the reviews. Please try again.

Products We Recommend


Product Enquiry Form

Multi-layer Foil Insulation SF40 by SuperFOIL - 1.5m x 10m Roll

*Required Field

SuperFOIL U-Value Calculation Request Form

Your Details

Project Details

Enter a value between 5 and 10000
*Required Field

Would you like to empty your basket?

Yes No


It seems you are running an older version of Internet Explorer. Our site does not support these old browsers as they do not house the technology that allows our site to be safe and secure.

If you wish to access our site please either upgrade your browser or download an alternative.