What Is Rock Wool and Why Is It a Preferred Insulation Material?

Insulation plays a key role in any modern home – especially in modular and prefabricated houses. Among all types of thermal insulation, rock wool (also known as mineral wool) stands out for its exceptional performance. In this article, we’ll explore what rock wool is, its key advantages, how it compares to other insulation materials, and why iHaus uses it in their houses.

1. What Is Rock (Mineral) Wool?

Rock wool is a fibrous insulation material made from melted basalt stone. It belongs to the family of mineral insulations (along with glass wool), but offers superior strength and durability.

Its characteristics include:

• High density and thermal resistance

• Breathable structure – allows walls to "breathe"

• Resistance to moisture, mold, and pests

  
  

2. Advantages of Rock Wool

• ✅ Thermal insulation – keeps heat in during winter and out during summer

• ✅ Sound insulation – excellent acoustic performance

• ✅ Fire resistance – non-combustible, does not drip or emit toxic gases

• ✅ Long-lasting – does not shrink, sag or degrade over time

• ✅ Eco-friendly – made from natural stone, no chemical additives

3. Comparison with Other Insulation Materials

Material	🧊 Thermal Insulation	🔇 Sound Insulation	🔥 Fire Resistance	💧 Moisture Resistance	💰 Price
Rock Wool	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐	💰💰💰
Polystyrene (EPS)	⭐⭐⭐⭐	⭐	❌	⭐⭐	💰💰
Glass Wool	⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐	⭐⭐	💰💰
Polyurethane Foam	⭐⭐⭐⭐⭐	⭐⭐	❌	⭐⭐⭐	💰💰💰💰

4. Where Does iHaus Use Rock Wool?

At iHaus, we install 10 cm thick rock wool with a density of 50 kg/m³ from Knauf in the external walls of our houses. It is combined with waterproofing and sound insulation layers to ensure maximum energy efficiency and comfort for year-round living.

Conclusion

Rock wool is the gold standard for insulation in prefab homes – safe, durable, and highly efficient. It offers year-round comfort and superior protection against fire, noise, and heat loss.

👉 Browse iHaus models and discover how rock wool insulation improves your home’s performance.