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Why ARMA FOIL™
No oxidation
An anti-oxidation coating protects reflectivity in attic heat and humidity, where uncoated foil degrades over time.
Optimal widths
51", 25.5" and 17" rolls fit 16" and 24" on-center joist spacing with the extra width needed to make the install much easier.
Bonded, not laminated
Traditional laminated foil turns brittle and rips. ARMA FOIL is bonded in a high tech process that keeps it strong.
Not sure which roll you need?
Specifications
| Widths: | 17", 25.5", 48" and 51" |
|---|---|
| Lengths: | 118 ft, 235 ft and 250 ft |
| Thickness: | 4 mil |
| Perforated: | Yes |
| Emissivity: | 0.05 (ASTM C1371) |
| Reflectivity: | 95% (ASTM C1371) |
| Fire Rating: | Class 1 / Class A (ASTM E84 / ASTM E2599) |
| Flame Spread: | 0 (ASTM E84 / ASTM E2599) |
| Smoke Development: | 10 (ASTM E84 / ASTM E2599) |
| Corrosivity: | PASS at 100% humidity (ASTM D3310) |
| Water Vapor Permeability: | 6.9 perms (ASTM E96) |
Installation Instructions
Frequently Asked Questions
Do I need perforated or non-perforated radiant barrier?
It depends on placement. Use perforated foil (this product) on the exterior side of your insulation, facing the roof, so moisture can escape. That's what we recommend for nearly all attic installations.
Use non-perforated ARMA FOIL™ VB only if your climate or code requires an interior vapor barrier, installed on the interior side with taped seams.
Use non-perforated ARMA FOIL™ VB only if your climate or code requires an interior vapor barrier, installed on the interior side with taped seams.
How does 95% reflectivity compare to 97% claims?
97% describes untreated aluminum on day one, before it oxidizes and loses reflectivity. ARMA FOIL™ has an anti-oxidation coating that protects its 95% rated reflectivity for years, not just at installation. 95% is also the minimum reflectivity required by code (for example, California Title 24).
Can I install radiant barrier myself?
Yes. ARMA FOIL™ is lightweight and installs with a staple gun and foil tape. Leave an air gap next to the foil and keep clearance at the eaves and ridge for ventilation. Most homeowners finish an attic in a weekend.
How much area does each roll cover?
The 51" × 235' and 48" × 250' rolls cover about 1,000 sq ft. The 51" × 118' and 25.5" × 235' rolls cover about 500 sq ft, and the 17" × 235' roll covers about 333 sq ft. Add 5–10% for overlaps and cuts.
Which width should I choose?
The 51" width is the most popular for stapling across rafters at 16" or 24" on center. The 25.5" and 17" widths are made to fit between joists, so you can run strips with minimal cutting.
Does radiant barrier replace my attic insulation?
No. Traditional insulation slows heat moving through it; radiant barrier reflects the sun's radiant heat before it gets in. Used together, they reduce both summer cooling costs and winter heat loss.
How much can I save?
Up to 90% of the heat a home gains comes through the roof as radiant heat. A properly installed radiant barrier can lower attic temperatures by 20–25°F on a hot day. Energy Star verifies a minimum of 17% cooling cost savings, and some of our customers report up to 25% savings on their whole electric bill. Results vary by home, climate and existing insulation.
Can I see a sample before ordering?
Yes. Request a sample and we'll send you a swatch of ARMA FOIL™.
What sets Energy Efficient Solutions apart?
We've sold more than 30 million sq ft of radiant barrier since 2008 and are trusted by more than 30,000 contractors and DIYers. Beyond the product, our team helps you choose the right material and install it correctly. Call +1 877 464 5828 with any question.