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Ultima-FOIL® radiant barrier 500 sf (solid vapor barrier)

SKU: RG-U-500-VB UPC: 852166008761

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Reflects/blocks 97% of the radiant heat.  Industrialized strength NASA inspired attic blanket designed for stapling to rafters, roof decking or wall studs. Blocks water vapor transmission.

  • RadiantGUARD® Ultima-FOIL radiant barrier

    Learn how this FOIL radiant barrier differs from our METALIZED radiant barrier.

    • is a double-sided, multi-layered aluminum radiant barrier approximately 6.5 mils in thickness (6.5 thousandths of an inch / .0065 inches),
    • is Class A / Class 1 fire rated (ASTM E84-10),
    • reflects (blocks) 97% of the radiant heat that strikes its surface across an air space,
    • is an industrialized-strength lightweight yet durable foil vapor barrier designed to hold staples without tearing (much more durable than products found in Lowes and Home Depot),
    • exceeds industry sauna specifications for a foil vapor barrier,
    • is also available in both a perforated (breathable) version (view our Buyers Guide to determine which version you need)
    • is available in 48" width 500 sf roll with a shipping weight of 17 lbs
    • 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 lifetime warranty,
    • and lowers heating and cooling costs year round.
  • RadiantGUARD® Ultima-FOIL Technical Specifications

    Thickness 6.5 mils (0.0065 of an inch
    Weight 500 sf roll = 15 lbs
    1000 sf roll = 28 lbs
    Tensile/Tear Strength Warp:27.0 pounds force
    Fill: 29.3 pounds force
    (ASTM D2261)
    Pliability 70°F ± 5°F & 50 ± 5% Relative Humidity
    No Cracking or Delamination
    (ASTM C1313)
    Adhesive Performance 180°F ± 5°F & 50% Relative Humidity
    No Bleeding or Delamination
    (ASTM C1313)
    Corrosivity 100% humidity at 71°C ± 2°C for 7 days
    (ASTM D3310-00)

    Resistance to Fungi

    PASS No Growth
    (ASTM C1338-00)
    Fire Rating
    Flame Spread
    Smoke Development
    Fire Rating: Class A / Class 1
    Flame Spread Test: 0
    Smoke Development: 10
    (ASTM E84-10)


    Perforated version: 8.5 perms
    Solid vapor barrier version: (.02 perms)
    (ASTM 96-00)
    Thermal Properties Reflectivity: 97%
    Emissivity: 3%
    (ASTM C1371-98)