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Ultima-FOIL® radiant barrier 1,000 sf (breathable)


Industrialized strength radiant barrier that reflects/blocks 97% of the radiant heat.

Roll is 4 feet wide and 250 linear feet long.

RadiantGUARD Ultima-FOIL®:

  • is double-sided approximately 6.5 mils in thickness (6.5 thousandths of an inch / .0065 inches),
  • is a Class A / Class 1 fire rated building product,
  • reflects (blocks) 97% of the radiant heat that strikes its surface across an air space,
  • is industrialized-strength lightweight yet durable designed to hold staples without tearing,
  • is non-toxic, non-carcinogenic, fiber-free, and does not require protective clothing or respirators to install,
  • is easy to install and maintenance free,
  • is not affected by moisture or humidity,
  • is proud to be covered by a 10 year warranty,
  • and lowers heating and cooling costs year round.

Learn more about the differences between aluminum foil vs metalized radiant barriers.

Technical Datasheet

Radiant barriers are not created equally. Today’s marketplace offers many different manufacturers with a wide variety of quality.

Based on knowledge gained from 15+ years in the reflective insulation marketplace, we’ve designed all our reflective products using the highest quality raw materials, manufacturing processes, and lamination machinery available in order to exceed ASTM testing requirements for performance and safety.

radiant barrier installed under attic rafters

Installing in an attic space

Radiant barriers are most commonly installed in an attic space stapled to the underside of the roof rafters or directly to the underside of the roof decking.

While they can be installed over the attic floor, care must be taken to make sure the attic space has adequate air flow to avoid condensation build up under the radiant barrier on the floor.