How Radiant Bubble Insulation Works

Radiant insulation works when the reflective foil surface faces an open air space. The reflective barrier helps reduce radiant heat transfer, making it ideal for sheds, metal roofs, walls, garages and many building applications.

When installed correctly with an air gap, foil bubble insulation can greatly improve the total R-value of the building system.

Pricing (Factory-Direct)

Size & Features

• Coverage: 30m² per roll
• Roll size: 25m long x 1.2m wide
• Thickness: 4mm
• Bubble width: 10mm wide bubbles
• Construction: Aluminium foil + bubble + reinforced aluminium foil woven cloth
• Base foil cloth: Reinforced for a tough, durable finish
• Reflectivity: 97% reflectivity on the side facing the sky
• R-value: Over R2 when installed correctly with the required air gap

Why Use Bubble Foil Insulation?

• Excellent for reducing radiant heat in sheds and roof spaces
• Ideal under metal roofing and wall cladding
• Helps improve summer comfort by reflecting radiant heat before it enters the building
• Lightweight, easy to handle and easy to install
• Reinforced foil surface for extra toughness
• Waterproof and suitable as a reflective insulation barrier
• Great for sheds, garages, workshops, roof spaces and general building applications

Product Specifications

Important Installation Notes

• The reflective foil surface must face an air space to work correctly.
• For best results, allow a thermal air gap, between metal roof and insulation of approximately 40mm to 100mm.
• When installing in a new shed roof, allow the bubble insulation to sag slightly between the rafters or top hats to create the air cavity.
• Overlap insulation by 150mm between rolls, or use a 50mm overlap with foil tape.
• The shiny foil side should face the sky when used under roofing.

The Concept of Radiant Insulation

Standard insulation products such as fibreglass, foam and cellulose mainly reduce heat transfer by trapping air. This helps reduce convection, but radiant heat can still be a major source of heat transfer in Australian sheds, roofs and building envelopes.

Reflective bubble foil insulation helps reduce radiant heat transfer by using low-emittance aluminium foil surfaces. The foil surface can reflect up to 97% of radiant heat when installed correctly with an adjacent air gap.

This is why a thin reflective material can perform extremely well as part of a complete building system when the correct air space is included.

Simple Heat Test Explanation

Foil based insulation works by helping bounce radiant heat away before it enters your roof space or shed.

1. If you put your hand directly on a hot fry pan, you would burn your hand.
2. If you pushed foil insulation hard against the hot plate with no air gap, heat would still transfer through.
3. But if the foil bubble insulation is held above the hot surface with an air gap, the radiant heat transfer is greatly reduced.

That air gap is the key reason reflective insulation performs so well.

Delivery & Pickup

• Most metro East Coast deliveries: included in the price
• Pickup: Narangba warehouse (open 5.5 days/week) and save around $40 per roll