BBA, the British Board of Agrement, have tested Superfoil SF60 to EN12667 and issued a test report. (see the down load section of this web site). Testing to standard EN12667 includes the test standards EN8301 and EN6946 and meets Building Regulation part L requirement of BR443, for regulation requirement for the testing of thermal performance of reflective insulation. Superfoil Insulation Systems use reflective technology to maximum thermal performance of a roof construction.
R values in Roofs with 1 layer of SF60 are R4.42 and one layer in walls is R4.88. when installed to our standard installation system method. For sloping roofs achieving U values of U 0.18 is easy with a 20mm HD foam board between or below rafters. For walls a U value of U 0.19 is achieved with 1 layer of SF60, this is far in excess of the usual building regulation requirement for walls of U 0.28. U values as low as U 0.1 can be achieved in other system combinations.
In addition Air tightness and Radiant Barriers are incorporated in the Superfoil Insulation System to reduce solar gain and air movement losses.
Just-Insulation (http://www.just-insulation.com/multifoil.html) had this to say about the Superfoil range:
“SuperFOIL– for and against:
SuperFOIL manufactures the largest variety of multi-foil products.
SuperFOIL SF19 (40mm) costs less per square metre than any of the other multi-foils that we sell.
SuperFOIL SF40 (65mm) represents the best value multi-foil when comparing cost against thermal performance, ie R Value 3.54.
SuperFOIL SF60 (100mm) is the most robust multi-foil product currently. available, and with an R Value of 4.643, it is, by far, the most effective multi-foil product available today.
SuperFOIL SFUF (6mm) multi-foil for under-floor insulation and heating systems costs almost half the price of its only competitor Actis Triso Sols
SuperFOIL products has LABC Registered System Approval No. RD199-0512. And SF19 and SF40 have BBA Test reports.”
As part of a program of school energy efficiency upgrades SF40 is being installed to schools in the Nottingham and Lancashire areas during the summer holidays, making buildings ready for the cold winter months. A bonus for schools is that SF40’s reflective radiant barrier keeps buildings cooler in summer too, combating solar gain (solar radiation) and reducing the need for air conditioning and making further energy savings.
The performance of SF40 exceeds all other standard multi layer foil insulation. As a premier product its been chosen for this prestigious schools program.
Double thickness SF40 is unique to Superfoil and is part of the Superfoil range that includes SF19, SF40, SF60 for roofs & walls, SFUF for floors and SFTV membrane.
In dormer cottages, (new roof or renovations) there is a section of the roof that takes a little thought to insulate well because the inside (room) and the outside (roof) are in very close proximity where the pitch of the roof cuts through the room, some times there is as little as 100mm between the warmth of the room room and the cold outside air. In a Swiss chalet type building this area can be quite large, in a dormer cottage its usually smaller .
A solution is to insulate both between and under the rafters. Superfoil SF19, SF40 or SF60 can all be used under the rafter in a COMBI arrangement with HD foam board between the rafters. Which Superfoil and how much foam board depends on the U value to be achieved (current building regs require at least U 0.18 , in Scotland its 0.15 for a roof insulated on the slope of the rafters ).
If the rafters are small as is often the case with manufactured trusses the depth of the rafters may be very limited and in those cases the higher performance Superfoils are used under the rafter . If the space between rafters is deeper as in a cut timber roof then more foam board insulation between rafters and the standard Superfoil SF19 under the rafter should give the desired performance. The pictures shown here are from a customers project, they have used SF40 under the rafters combined with 60mm of Kingspan K5 PIR foam board between rafters, ( a 25mm air gap between them). a 38mm batten is in place for the fixing of the plasterboard. The result in this project is a better than building regulations 0.16 U value.
With SF60, which the highest performance multifoil avalabe in Europe under the rafters you can achieve U 0.18 even on rafters as small as 85mm deep by using 20mm of foam board eg PIR board. Combinations of Superfoil and foam board to meet U0.18 include SF60 with 20mm of foam board, SF40 with 45m of foam board, SF19 with 80mm of foam board. Assuming Kingspan K5 or similar and 25mm air gap. Specifications can vary from project to project, ask us for a U value calc for your particular construction.
Other solutions using Superfoil in DUET format (2 layers ) in under or over rafters combinations are also possible to achieve U values as low as 0.11.
Winter is still some way off, but ahead of the coming Winter Superfoil has released a new and very competitively priced Cold Weather tape, SFCW, its available in 50m rolls and is 80mm wide with an RRP of £10.65 per roll. This joins the standard SFMP tape which is 20m long x 100mm wide with an RRP of £6.95 and the pure Aluminium tape SFPA 45m x 100mm with an RRP of £9.95. Individual rolls and Boxes of 18 rolls are available.
A video demonstrating SF40 being used on a school refurbishment project.
Taking a school from poor insulation ratings to better than current regulations, providing the students and teachers with a high level of comfort and warmth.
Chosen for its ease of installation and cost efficiency, no other brands’ multi-foil has the performance of SuperFOIL SF40!
A short video showing just how easy it is to retrofit your house with SuperFOIL!
Armed with some scissors, a stapler and a roll of foil tape you see the workers re-fitting an attic with SuperFOIL insulation.
You can request a free sample pack and the SuperFOIL team are always happy to provide any needed information.
Air is a very good insulator, for instance the thermal conductivity of air is 0.24, which is much better than old fashioned glass fibre at 0.44 (the lower figure the better). Above and beyond that a sealed air gap next to a reflective surface improves the R value of the air, there is a useful EN standard called EN6946 that you can use to calculate the R value of an air gap if you have the emissivity (reflectiveness) of the foil.
A sealed air gap will be up to 200% improved if the emissivity of the foil is good. Air is a good insulator but its important that the air is kept still; convection currents in air reduce performance. This is why glass wool was used an an insulator for a long time, it works to keep air from moving around. If you compare the thermal conductivity of glass to glass fibre it is very poor (think how cold single glazing is); the same glass made into glass wool is a lot better because although its an open structure it’s trying to keep the air still. Foam board is the same, doing what glass wool does but more efficiently.
Multi layer foil insulation takes the technology further, combining sealed air gaps with reflective surfaces to not only create efficient air gaps but to create super efficient low emissivity air gaps. Each layer in Superfoil multi foil insulation creates an improved performance air gap and beyond that creates improvements between its self and the plaster board below and the secondary rain barrier membrane above.
In a roof EN6946 states that the efficiency starts to reduce in air gaps below 13mm, in walls its 20mm. Battens are incorporated in the construction detail of Superfoil multifoil to ensure the minimum air gap is maintained. A multilayer foil can reduce a timber frame wall from 300mm, sized to accommodate the amount of glass wool needed, to that needed purely for structural strength, which may be only 100mm. A significant saving on timber and labour is achieved.
Air is a good insulator and Superfoil multifoil insulation takes the greatest advantage of that. Air is also probably the cheapest form of insulation available! Superfoil multilayer foil insulations maximize the contribution of air, by applying science and technology to create a leading edge insulation.
SF40 our double thickness foil insulation is a favorite with professional loft converters and self builders alike, SF40 is combined with with 40mm foam backed plasterboard to give a U 0.18 is an LABC approved registered detail and meets current building regs the finished ceiling will be 90mm ( 3 1/2 inches) below the rafter
No insulation is required between rafters at all, great for time and cost saving and where rafters are small and the often essential ventilation gap is not lost.
SF40 can be used in a variety of ways, for those insulating under rafters using two layers of SF40 provides easy install and excellent results.
A standard SF40 2 layer ”Duet” detail is ;- Rafter, SF40, Batten, SF40, Batten, Plasterboard, this gives a U value of 0.147 , the finished ceiling will be 143mm mm ( 5 5/8th inches) below the rafter (see below picture figure B).
A couple of other details brought to our attention by experienced installers giving home owners higher specifications are U 0.135 this requires adding a layer of SFTV and another batten in the middle, the finished ceiling will be 156mm mm ( 6 3/8th inches) below the rafter (see below picture figure A). Or for space saving without the central middle low emissivity air gap its U 0.157 the finished ceiling will be 130mm mm ( 5 1/8th inches) below the rafter (see below picture figure C).
All 3 options give ease of install, add to air tightness, provide a radiant barrier which reduce solar gain in summer with improved thermal performance significantly better than current regs.
Download the full size 2D image here
To request U value calculations and install details use the contact button.