Introduction: The Mathematics of Heat Transfer
Energy codes demand exact math. If you specify the wrong fiberglass density, heat escapes. Condensation ruins the steel framing. HVAC operating costs explode. As a top-tier B2B supplier of thermal insulation products, we source directly from verified OEM factories. We demand absolute non combustible class a building insulation. Here is the strict engineering logic for PEB roof and wall insulation.
1. Thermal Equations & R-Value Matrix
You must calculate the thermal conductivity glass wool peb parameters before ordering.
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U-Value (Heat Transfer Coefficient):
U = K / T[W/(m²·°C)] -
R-Value (Thermal Resistance):
R = 1 / U = T / K[m²·°C/W] -
Example: Take a 100mm thick blanket at 12 kg/m³ density. The K-value is 0.043 at 24°C. U = 0.043 / 0.10 = 0.43 W/m²·°C. R = 2.33 m²·K/W. Do not guess these numbers. Use this engineered wholesale matrix.
| Thickness | 12 kg/m³ (K=0.043) | 14 kg/m³ (K=0.040) | 16 kg/m³ (K=0.039) | 20 kg/m³ (K=0.037) | 24 kg/m³ (K=0.036) |
| 50 mm | 1.2 | 1.3 | 1.3 | 1.4 | 1.4 |
| 75 mm | 1.7 | 1.9 | 1.9 | 2 | 2.1 |
| 100 mm | 2.3 | 2.5 | 2.6 | 2.7 | 2.8 |
| 150 mm | 3.5 | 3.8 | 3.9 | 4.1 | 4.2 |
2. Vapor Barrier Facings: WMP vs FSK
Bare fiberglass absorbs moisture. You must seal it. The debate between fsk aluminum foil vs wmp vinyl facing comes down to lighting and permeance.
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WMP-50 (Premium White Vinyl): Ultra-low permeance rating of 0.02 Perm. It delivers >85% light reflectance, drastically cutting interior lighting costs. It features +75mm tab extensions on both sides for seamless joint stapling.
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FSK (Foil-Scrim-Kraft): Metallic aluminum face. Matches the 0.02 Perm rating. Features +50mm tab extensions. Best used in concealed cavities where light reflectance is irrelevant.
3. Sourcing Specification Matrix
Match your exact factory requirement to the OEM part numbers below.
| Facing Type | Thickness | Density | Part No. | Max Roll Length |
| WMP-VR (Standard White) | 2″ / 50 mm | 12 kg/m³ | 810541 | 30 m |
| WMP-VR (Standard White) | 4″ / 100 mm | 12 kg/m³ | 810545 | 17 m |
| WMP-50 (Premium White) | 2″ / 50 mm | 12 kg/m³ | 902213 | 30 m |
| WMP-50 (Premium White) | 4″ / 100 mm | 12 kg/m³ | 902215 | 17 m |
| FSK Aluminum Foil | 2″ / 50 mm | 12 kg/m³ | 810831 | 30 m |
| FSK Aluminum Foil | 4″ / 100 mm | 12 kg/m³ | 810834 | 17 m |
| Unfaced (Bare Glass Wool) | 2″ / 50 mm | 12 kg/m³ | 810977 | 30 m |
| Unfaced (Bare Glass Wool) | 4″ / 100 mm | 12 kg/m³ | 810979 | 17 m |