Thermal Engineering in Prefab: Rock Wool vs. PU Insulation Performance

Selecting the right insulation core is critical for modular buildings. The choice affects not only the R-value but also the structural lifespan and fire safety of the unit. Here is a technical breakdown of high-density insulation materials used in modern prefab architecture.

The Rock Wool Advantage (80kg/m³)

For industrial and commercial applications, high-density rock wool is the preferred material. With a density of 80kg/m³, it provides exceptional thermal inertia.

• Fire Rating: Class A Non-combustible. This is mandatory for mining camps and multi-story modular offices.
• Acoustics: Significantly reduces ambient noise transfer, making it ideal for high-density living quarters.

EPS and PU: Cost vs. Efficiency

EPS (Polystyrene): The standard 75mm EPS panel is the most cost-effective solution for temperate climates. It is lightweight and offers a clean, pure-white interior finish.
PU (Polyurethane): Offering the highest R-value per inch, PU is essential for extreme cold or tropical heat. High-density PU panels prevent "thermal bridging" more effectively than any other material.

Addressing "Container Rain"

Condensation occurs when warm interior air hits the cold steel frame. Professional prefab engineering solves this through integrated vapor barriers and internal drainage systems. By ensuring the insulation core is tightly bonded to the 0.3mm to 0.4mm outer steel skin, the risk of rust and mold is virtually eliminated.

Summary

For maximum safety and longevity, specify 75mm high-density rock wool. For residential comfort in extreme climates, PU reinforced panels offer the best energy efficiency. Always consult your engineer regarding local building R-value requirements.