Performance
Reflects up to 98% of radiant heat
Low-emissivity aluminium faces turn infrared energy back, where fibre insulation would absorb it.
Reflect the heat.Keep the comfort.
Reflective foil, radiant barrier and vapour barrier insulation for homes, metal buildings and farms, made by Alumix and shipped to more than 20 countries.
- 33 years manufacturing
- 20+ countries supplied
- Reflects up to 98% of radiant heat
A manufacturer, not a reseller.
We design and produce our own reflective insulation, from slim single foils to nine-layer multi-foil blankets, and develop tailor-made products with our R&D team.
33
Years manufacturing thermal insulation
250+
Products across radiant and vapour barriers
20+
Countries supplied through our distributors
98%
Of radiant heat reflected, at best
Stop radiant heat at the surface.
Most summer heat enters through the roof as radiation. Each Alumix range turns it back with low-emissivity aluminium, in a build to suit the job.
All products
Gold multi-layer
Multi-layer and multi-foil builds for the hardest-working roofs, up to 16mm thick.
Up to 16 mm · BS 476 Class 0/1 options
Silver
Double-sided bubble foil in 6 and 8mm, with fire-retardant and net-reinforced grades.
6 and 8 mm · FR grades to BS 476 Class 1
Bronze
Slim 4mm foil for re-roofing and tight spaces. The economical all-rounder.
4 mm · Basic and FR grades
Ceiling and loft
Drop-in T-bar panels and thick multi-foil blankets for ceilings and lofts.
60 x 60 cm panels · 25 to 40 mm blankets
Browse all 13 products
Explore productsSee where Alumix goes
Pick a building type, then tap a point to see which Alumix insulation suits that part of the structure.
Under the roof
Laid under the battens before the tiles go on, the foil turns back radiant heat from the hot roof covering before it reaches the attic.
Recommended
Bronze FR 4mm Fire Rated Reflective Foil Insulation
Silver FR 8mm Fire Rated Reflective Foil Insulation
Attic floor
Rolled across the ceiling joists, a multi-foil blanket stops the attic's trapped heat from radiating down into the rooms below.
Recommended
Installation guideExternal walls
Behind cladding or render, a breathable reflective wrap cuts heat gain through sun-facing walls while letting moisture escape.
Recommended
RADWRAP T180 REF Breathable Reflective House Wrap
Silver FR Net 8mm Reinforced Fire Rated Reflective Insulation
Internal walls
Inside partitions and drylined walls, slim foil adds a radiant barrier where there is little room for bulk insulation.
Recommended
Windows
A ready-made reflective curtain blocks one of the biggest heat sources in any room: direct sun through the glass.
Recommended
Floors
Under screeds and floating floors, foam-backed foil reduces heat loss to the ground and dampens impact noise.
Recommended
Installation guideOver the purlins
Run over the purlins just under the roof sheets, foil stops the metal roof's radiant heat and helps control condensation drip.
Recommended
Installation guideUnder the rafters
Fixed to the underside of the rafters, foil lines the roof from inside, which makes it a practical retrofit for existing sheds.
Recommended
Installation guideWall cladding
Between the girts and the wall sheeting, reflective insulation keeps sun-heated cladding from radiating heat into the building.
Recommended
Installation guideOffice ceiling
Drop-in 60 x 60 cm reflective panels upgrade a suspended T-bar ceiling in site offices and mezzanines.
Recommended
Under the roof sheets
Under the roof sheets, foil lowers the radiant heat load on the animals below and helps reduce heat stress through the summer.
Recommended
Installation guideUnder the trusses
Fixed to the underside of the trusses, multi-layer foil retrofits an existing shed without taking the roof off.
Recommended
Side walls
Lining the side walls stops sun-heated sheeting from radiating heat into the pens.
Recommended
Installation guideBuilt different. Works differently.
Bulk insulation slows heat as it passes through. Reflective insulation stops radiant heat before it gets in.
Fibre-free to handle and install
No itchy fibres and no dust masks. Rolls cut with a utility knife and fix with staples or tape.
Fire-rated grades
Flame-retardant versions across the Silver, Bronze and Gold ranges.
Pairs with bulk insulation
Moisture and vapour control
Closed-cell faces shed water and resist vapour, helping protect timber and steel from condensation.
For distributors
Partner with us Made to your specification
Flexible production runs, private label and tailor-made builds for every market and budget.
How reflective insulation works
- 01
The sun heats the roof
Roof coverings absorb solar energy and grow hot. That heat then radiates down toward the rooms below as infrared energy.
- 02
Foil sends it back
A low-emissivity aluminium face reflects up to 98% of that radiant heat before it can pass into the building.
- 03
The air gap does the work
Foil performs best facing a still air space. Even a small gap lets the reflective surface do its job; sealing it away removes the benefit.
- 04
Rooms stay comfortable
Less radiant heat gets in during summer and less escapes in winter, so heating and cooling systems run less.
Reflective.Not absorptive.
Fibreglass and mineral wool slow heat down but still soak it up. Alumix foil reflects radiant heat at the surface, stays dry, and keeps working for the life of the building.
See the application gallery
Your manufacturing partner in 20+ countries
Distributors around the world rely on Alumix for consistent quality, certified products and a range wide enough to cover every project their customers bring.
Become a distributorPrivate label and custom builds
Tailor-made products and branding, developed by our R&D team for your market.
Certification support
Extensive experience certifying products to the standards your customers ask for.
Flexible production
Run sizes and specifications that fit every requirement and budget, delivered on time.
Trade shows 2019 to 2025Events
Specify the right foil for your next build.
Tell us about your project and our team will recommend the product, size and quantity.