Insulation Overstock
Wholesale Fiberglass Insulation · insulationoverstock.com
Doc: IO-SPEC-FOIL-01
Rev: 2026-07
Foil-Faced Fiberglass Insulation — Radiant Barrier
Aluminum-foil-faced fiberglass insulation. Combines fiberglass R-value with 97% radiant heat reflection and a near-impermeable vapor barrier for attics, roofs, and radiant-critical applications.
Physical Specifications
| Facing Type | Aluminum foil laminated to scrim |
| Facing Color | Reflective aluminum silver |
| Substrate | NAIMA-certified fiberglass batt |
| Available Widths | 4 ft, 5 ft, 6 ft |
| Available Lengths | 16 ft to 100 ft rolls |
| Foil Emissivity | 0.03 (industry-leading radiant reflection) |
Performance Data
| R-Value Range | R-8 through R-25 |
| Vapor Permeability | 0.05 perms (near-total vapor barrier) |
| Radiant Heat Reflection | 97% |
| Fire Rating | Class A / Class 1 (ASTM E84) |
| Tensile Strength | 45 lbs/in (MD/CMD) |
| VOC Emissions | Compliant with CDPH 01350 |
R-Value / Thickness / Wholesale Rate
| R-Value | Nominal Thickness | Wholesale Rate ($/sq ft) | Recommended Use |
|---|---|---|---|
| R-8 | 2.5″ | $0.62 | Radiant-only attic barrier |
| R-10 | 3.0″ | $0.68 | Cathedral ceilings, hot climates |
| R-11 | 3.5″ | $0.72 | 2x4 wall in hot climate zones |
| R-13 | 3.625″ | $0.82 | Radiant-barrier wall assemblies |
| R-19 | 6.0″ | $1.12 | Sun-facing roof, cathedral ceilings |
| R-25 | 8.0″ | $1.42 | Hot-climate high-performance roofing |
Standards Compliance
| Material Standard | ASTM C665 Type III Class A |
| Fire Testing | ASTM E84 (Class A) |
| Emissivity Testing | ASTM C1371 |
| Radiant Barrier | ASTM C1313 compliant |
| Return Policy | 30-day inspection window |
Recommended Applications
| Attic Roof Deck | Best-in-class radiant control |
| Cathedral Ceilings | Roof deck under-side, hot climates |
| Post-Frame Roofs | Radiant heat reduction in metal roofs |
| Hot-Climate Walls | Sun-facing wall assemblies |
| Best For | Radiant-critical or moisture-sensitive assemblies |
Ordering
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