Billegraphite® Graphite Bead Insulation
The smart loose-fill solution for underfloor, wall cavities and flat roofs. ACERMI certified · λ 0.0315 W/m·K · Made in France.
What is Billegraphite®?
Billegraphite® is a loose-fill insulation made from graphite-enhanced expanded beads (EPS + graphite). The addition of graphite significantly reduces the thermal conductivity compared to standard EPS, achieving a lambda value of 0.0315 W/m·K — among the best available for loose-fill products.
Unlike rigid boards or rolls, Billegraphite® fills every gap, corner, and irregularity with no cutting waste. It flows around obstacles like pipes and joists, delivering uniform, thermal-bridge-free coverage in any configuration.
Why Choose Billegraphite®?
- 🌡️ High thermal performance λ = 0.0315 W/m·K — better than mineral wool and standard EPS.
- ✅ ACERMI certified Independent French certification body. Eligible for energy renovation grants.
- 🇫🇷 Made in France Manufactured in France. Short supply chain, low carbon footprint.
- 📐 Effective from 2 cm Achieves measurable R-value in very tight spaces where boards won't fit.
- 🪟 Breathable assembly Vapour-open and diffusion-compatible. No vapour barrier required in most assemblies.
- ♻️ Waste-free installation Pour-in-place application. No cutting, no offcuts. Fast and clean.
Technical Specifications
| Product type | Loose-fill graphite EPS bead insulation |
| Thermal conductivity λ | 0.0315 W/m·K |
| Certification | ACERMI (France) |
| Min. effective thickness | 2 cm |
| Material | Graphite-enhanced EPS (grey EPS) |
| Application method | Pour-in / blow-in |
| Country of manufacture | France |
| Applications | Underfloor · Wall cavities · Flat roofs · Crawl spaces |
Frequently Asked Questions
What is graphite bead insulation?
Graphite bead insulation is a loose-fill product made from expanded polystyrene (EPS) beads enhanced with graphite particles. The graphite absorbs and reflects radiant heat, giving the product a lower thermal conductivity than standard white EPS. Billegraphite® achieves λ = 0.0315 W/m·K.
Is Billegraphite® suitable for underfloor insulation?
Yes. Billegraphite® is particularly effective for insulating suspended floors, crawl spaces, and sub-floor voids. It fills the entire joist bay completely, eliminating cold bridges with no need for cutting or fitting rigid boards.
What certification does Billegraphite® hold?
Billegraphite® is ACERMI certified — the independent French certification body for thermal insulation products. This certification guarantees declared lambda values and makes it eligible for French energy renovation subsidies (MaPrimeRénov').
What is the minimum thickness for effective insulation?
Billegraphite® delivers measurable thermal resistance from just 2 cm thickness. This makes it one of the few insulation products effective in very tight voids where rigid boards simply cannot be installed.