California · Title 24
Radiant Barrier That Meets California Title 24 Performance Requirements.
Thermal emittance of 0.04 against the Title 24 ≤ 0.10 threshold — independently measured to ASTM C1371 by an ISO/IEC 17025 accredited laboratory. The performance data your California spec needs.
What Title 24 Asks For
Emittance is the number.
California's Title 24 energy code recognizes radiant barriers as a prescriptive measure in the applicable climate zones. To qualify on performance, the material's thermal emittance must be 0.10 or lower, measured to ASTM C1371 — a lower number means more radiant heat reflected back out of the assembly.
Most code-explainer sites stop there. We're a manufacturer with the lab data to back the number — and we'll hand it to you.
Measured thermal emittance · ASTM C1371
2.5× better than the Title 24 ≤ 0.10 performance threshold.
How It Measures Up
Every Title 24-relevant threshold — cleared.
| Requirement | Standard | CA threshold | IIP measured | Margin |
|---|---|---|---|---|
| Radiant-barrier emittance | ASTM C1371 | ≤ 0.10 | 0.04 | 2.5× better |
| Flame spread — Class A | ASTM E84 | ≤ 25 | 0 | perfect |
| Smoke developed — Class A | ASTM E84 | ≤ 450 | ≤ 30 | 15× better |
| Class I vapor retarder | ASTM E96 | ≤ 0.1 perm | 0.04 perm | exceeds |
Source: R&D Services Inc. report RD251061 (ISO/IEC 17025 accredited). Performance verified to the listed ASTM methods. Download the summary →
California Projects
Specifying in California? Let's get you the data.
We'll send the performance summary and manufacturer-direct pricing for your project — and freight from Texas, not a coastal lead time.