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Close-up of a Sisalation foil roll showing the double-sided reflective surface

Sisalation

Price range: R1,825.00 through R2,599.00
Select options This product has multiple variants. The options may be chosen on the product page
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Close-up of Alububble’s bubble core and double-sided foil surface texture

Alububble

Price range: R1,904.00 through R1,929.00
Select options This product has multiple variants. The options may be chosen on the product page
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Radiant Barrier Reflective Foil Insulation

A radiant barrier reflects a large share of solar heat before it enters the roof space, helping buildings stay cooler and drier. Installed under metal or tiled roofs with a small air gap, these foils also provide dependable vapour control to reduce condensation. For best results, use a radiant barrier together with bulk roof insulation to meet your thermal targets.

Our Radiant Barrier Options

Choose from our foil options designed for metal or tiled roofs. They help cut roof heat and control condensation with dependable vapour-barrier performance, install quickly over purlins with taped overlaps, and are available in grades to suit different fire classifications and project specs. Compare the options below and pair your choice with bulk ceiling insulation for the best overall results.

1. Sisalation – (FR405 / FR430 / Fireshield NC 502 D/S)

A durable, double-sided reflective foil used across light- to heavy-industrial and public-use buildings. Options range from cost-effective FR405 to heavy-duty FR430, plus Fireshield NC 502 D/S for stricter fire classifications. Strong tear resistance, sealed overlaps, and fast over-purlin installation make Sisalation a reliable choice for commercial projects.

Explore: Sisalation

2. Alububble – 4mm 2906 D10

A lightweight bubble-core foil with reflective faces and very low emissivity. Designed for quick over-purlin installs in warehouses and factories, Alububble helps curb heat gain and moisture while keeping handling simple on site. Multiple roll lengths available to match project needs.

Explore: Alububble

Why Use a Radiant Barrier?

  • Lower roof heat gain for improved comfort and HVAC efficiency
  • Vapour-barrier performance to help control condensation
  • Fast installation over purlins with straining wire and taped laps
  • Pairs perfectly with bulk insulation to reach target R-values

Installation Snapshot

Fit foil over purlins, keep laps clean and dry, tape all overlaps, and maintain the designed air space. For metal roofs, include the required thermal break and follow your project’s fire and occupancy specifications.

Need a hand?

Not sure which specification is right for your site? Contact Insulation SA for quick guidance and pricing—we’ll match the correct radiant barrier to your roof type, fire class, and budget.