Bubble Foil Insulation Sheets

Lightweight insulation for heat reflection and thermal control.

On a peak summer afternoon, the surface temperature of a metal roof in India can exceed 70°C to 80°C – and without effective insulation, that heat radiates directly into the building below, driving up internal temperatures, increasing cooling loads, and raising energy costs around the clock. Bubble Foil Insulation Sheets from Astal Roofing Industries are engineered specifically to block this radiant heat transfer at source – combining a reflective aluminium foil surface with an air bubble core to deliver a lightweight, high-performance thermal barrier that installs quickly and performs consistently across the full service life of the building.

What Are Bubble Foil Insulation Sheets?

Bubble Foil Insulation Sheets – also known as reflective bubble insulation or aluminium bubble foil insulation – are multi-layer thermal insulation sheets constructed from one or two layers of reflective aluminium foil bonded to a core of air-filled polyethylene bubbles. The aluminium foil surface reflects up to 97% of radiant heat away from the building interior, while the trapped air in the bubble core provides an additional layer of thermal resistance that slows conductive heat transfer through the sheet.

Unlike mass insulation materials such as glasswool or rockwool that work by absorbing heat in their fibrous bulk, bubble foil insulation works primarily by reflection – making it particularly effective in the radiant heat-dominated environment of metal roofing systems in India, where the majority of heat gain into a building comes from solar radiation through the roof rather than conduction through walls.

Available Thickness Range - 4mm to 20mm

4mm

Light insulation for wall linings & HVAC duct wrap

6–8mm

Standard roof insulation for commercial & industrial buildings

10–14mm

Enhanced thermal barrier for large-span industrial roofs & cold storage

16–20mm

Maximum performance insulation for high heat-load industrial facilities & green buildings

Key Features & Technical Specifications

Reflective Aluminium
Foil with Air Bubble Core

The dual-function construction combines a high-purity aluminium foil outer surface – with a reflectivity rating of up to 97% – with a polyethylene air bubble core that provides both thermal resistance and mechanical cushioning, delivering a composite insulation performance that outperforms single-layer reflective films in real-world roofing applications.

Blocks Radiant
Heat Transfer

The aluminised surface reflects the majority of incoming solar radiation before it can be absorbed and re-radiated as heat into the building interior – directly reducing the radiant heat load on the occupied space below the roof and significantly lowering peak internal temperatures during summer months across India’s high solar irradiance climate zones.

Reduces Energy
Consumption

By cutting the radiant heat gain through the roof, bubble foil insulation reduces the cooling load on air conditioning and mechanical ventilation systems – translating directly into measurable reductions in electricity consumption, lower operating costs, and a faster return on the insulation investment for facility owners and project developers.

Lightweight &
Easy to Install

At a fraction of the weight of glasswool or rockwool insulation of equivalent thermal performance, bubble foil sheets can be handled and installed by a small team without specialist lifting equipment – installed by rolling out between roofing purlins and sheets, stapling or taping at laps, and cutting to size with standard hand tools, significantly reducing installation time and labour cost.

Moisture & Vapour Resistant

The sealed polyethylene bubble core and aluminium foil facing are completely impermeable to moisture and water vapour – preventing the condensation absorption, mould growth, and performance degradation that affect fibrous insulation materials in humid industrial environments, and maintaining full thermal performance across the building’s service life without replacement or remediation.

Available in Multiple
Thicknesses - 4mm to 20mm

A wide thickness range from 4mm to 20mm allows precise thermal performance specification for every application – from lightweight wall linings and HVAC duct wrap at the thinner end, to high-performance roof insulation and thermal barriers for cold storage and energy-efficient building applications at the thicker end of the range.

Applications

Roof Insulation

Installed between roofing purlins and metal roofing sheets – the single most effective location for bubble foil insulation, blocking radiant solar heat at the point of entry before it reaches the occupied space below.

HVAC Systems

Used as duct wrap insulation on air conditioning and ventilation ductwork – preventing thermal loss from cooled air in supply ducts and reducing condensation on cold surfaces in humid industrial environments.

Wall Thermal Barriers

Installed behind wall cladding panels on the sun-facing elevations of industrial buildings – reducing radiant heat gain through west and south-facing walls that contribute significantly to afternoon heat build-up in large facilities.

Floor Insulation

Used beneath floor screeds and raised access floors in temperature-controlled facilities – providing a thermal break that reduces heat transfer between the ground slab and the occupied floor space above.

Why Choose Bubble Foil Insulation Over Glasswool or Rockwool?

For metal roofing systems in India’s climate, bubble foil insulation has several practical advantages over traditional fibrous insulation materials that make it the preferred specification for many industrial and commercial projects:

Weight

Bubble foil weighs a fraction of glasswool or rockwool – reducing dead load on the roof structure and making handling and installation significantly faster and safer on site.

Moisture resistance

Unlike glasswool, which absorbs moisture and loses thermal performance when wet, bubble foil is completely impermeable – maintaining full performance in humid roofing environments without degradation.

Installation speed

Roll-out installation between purlins is faster and requires less labour than fitting and securing batts of glasswool – reducing installation cost on large industrial roof areas.

Radiant heat performance

In metal roofing environments where radiant heat is the dominant heat transfer mechanism, reflective insulation outperforms mass insulation materials that are optimised for conductive heat resistance.

Why Source Bubble Foil Insulation from Astal Roofing?

At Astal Roofing Industries, Bubble Foil Insulation Sheets are supplied as part of our complete industrial roofing system – specified alongside our roofing sheets, purlins, and accessories to deliver a fully coordinated, thermally optimised building envelope from a single supplier. Our team provides insulation specification support, thickness selection guidance, and installation advice to ensure the correct product is selected for your building type, roof span, and thermal performance target.

We supply bubble foil insulation in bulk roll quantities to EPC contractors, roofing sub-contractors, and project procurement teams across India – with competitive pricing, consistent product quality, and coordinated delivery alongside roofing sheet and accessory orders for simplified project logistics.