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  • Writer's pictureBona House Materials

7 Questions about rockwool acoustic panels

Question 1: What are the advantages of rockwool acoustic panels in building heat preservation and fire prevention? What problems should be paid attention to in building heat preservation and fire prevention?

Rockwool acoustic panels offer significant advantages in both heat preservation and fire prevention for buildings. Here's a breakdown of their benefits and key considerations:

rockwool acoustic sandwich panels


  • Heat Preservation: Rockwool is a natural insulator, trapping air within its fibers to resist heat transfer. This translates to cooler spaces in summer and warmer spaces in winter, reducing energy consumption for heating and cooling systems.

  • Fire Prevention: Rockwool is a non-combustible material, classified as Class A fireproof. This means it will not ignite or contribute to the spread of flames in a fire event. Additionally, rockwool panels can provide fire resistance by slowing down the spread of heat, allowing for more time for occupants to evacuate and firefighters to respond.

Problems to Pay Attention to During Building with Rockwool:

  • Moisture Management: While rockwool is water-resistant, excessive moisture exposure can compromise its insulating properties and lead to mold growth. Proper ventilation and moisture barriers are crucial during installation.

  • Skin and Respiratory Irritation: Rockwool fibers can irritate the skin and respiratory system during installation.  It's important to wear appropriate personal protective equipment (PPE) like gloves, long sleeves, respirators,  and safety glasses when handling rockwool.

  • Professional Installation: Rockwool panels should be installed by qualified professionals to ensure proper fit and avoid compromising the thermal and fireproofing performance of the system.

  • Fire Safety Regulations: Always adhere to all local fire safety codes and regulations when selecting and installing building materials.

  • Fire Prevention Plan: Implement a comprehensive fire prevention plan that includes fire alarms, sprinkler systems, and designated evacuation routes.

  • Regular Maintenance: Regularly inspect and maintain fire safety equipment to ensure its functionality in case of an emergency.

By understanding the advantages of rockwool acoustic panels and addressing potential concerns during installation, you can leverage their excellent heat preservation and fire prevention properties to create a safe and energy-efficient building.

Question 2: Rock wool products is with good thermal conductivity and fire resistance, how about its tensile strength, water absorption and durability?

Please see below the rockwool's strengths:

  • Tensile Strength: Rockwool has moderate tensile strength, sufficient for most building applications where the panels are not subjected to significant pulling forces. Also, its tensile strength is related to rockwool density.

  • Water Absorption: While rockwool is water-resistant, it can absorb some moisture. However, high-quality rockwool panels with proper installation techniques can minimize water absorption and maintain their insulating properties.

  • Durability: Rockwool is a highly durable material with a long lifespan. It can withstand extreme temperatures, harsh weather conditions, and minimal physical impact.

Question 3: Can rock wool acoustic panels be applied to the external wall insulation composite system?

Absolutely, rockwool acoustic panels are well-suited for application in external wall insulation composite systems (ETICS):

  • Low Thermal Conductivity: Rockwool excels at trapping air, leading to a low thermal conductivity and superior insulation performance. This translates to significant energy savings for heating and cooling buildings.

  • Good Permeability: Rockwool allows some water vapor to pass through,  which helps prevent moisture buildup within the wall system, promoting breathability and reducing the risk of mold growth.

  • High Fire Performance: Rockwool is a non-combustible material (Class A fireproof) and offers excellent fire resistance. This significantly enhances the fire safety of buildings, particularly crucial for high-rise structures.

  • Compatibility: Rockwool can be used in conjunction with other thermal insulation materials, even those with lower fire ratings, to improve the overall fire resistance of the ETICS.

Question 4: In Europe, such as Germany, does rock wool acoustic panels only occupy a small market share in all applications of external insulation composite system?

rock wool acoustic panels be applied to the external wall insulation composite system

  • High-Rise Buildings: In Germany, rockwool acoustic panels hold a dominant position (100% market share) for ETICS in high-rise buildings exceeding 22 meters. This dominance is likely due to rockwool's superior fire safety performance, a critical factor in high-rise construction.

  • Overall Market Share: Rockwool's overall market share for ETICS in Germany is 5.6%. This statistic encompasses various building types where other materials might be more prevalent or cost-effective for lower-rise structures.

In essence, rockwool plays a significant role in German ETICS, particularly for high-rise buildings due to its fire safety advantages. However, other insulation materials might be more commonly used in overall ETICS applications across different building types.

Question 5: What's the difference between rock wool and slag wool?

Raw Materials:

  • Rockwool: Made from molten rock, primarily basalt or diabase.

  • Slag Wool: Primarily composed of industrial waste products, like leftover slag from iron ore production.

Key Properties:

  • Melting Point: Rockwool has a significantly higher melting point compared to slag wool, making it more fire-resistant.

  • Thermal Conductivity: Rockwool has lower thermal conductivity, translating to better insulation performance.

  • Acidity: Rockwool is generally less acidic than slag wool.


  • Rockwool: Widely used in construction for thermal insulation and fireproofing, particularly suitable for ETICS (external wall insulation composite systems) due to its superior fire safety.

  • Slag Wool: Less suitable for applications requiring high fire resistance or superior thermal insulation. It may be used for some non-critical applications where cost is a major factor.

In summary, rockwool is the preferred choice for thermal insulation and fireproofing due to its high melting point, low thermal conductivity, and suitability for ETICS, while slag wool, a cheaper alternative, has limitations due to its lower fire resistance and higher thermal conductivity. 

Question 6: Will rock wool acoustic panels cause harm to human health?

Major organizations like the World Health Organization (WHO) have extensively studied rockwool fibers and found no evidence of carcinogenicity (ability to cause cancer). These studies classify rockwool as "not classifiable as human carcinogens."

The research on rockwool's carcinogenicity is well-documented and accessible to the public. As of now, there are no known health restrictions on the use of rockwool acoustic panels.

By the way, to reach B1 fire rated grade, a flame retardant sometimes used in foam products, which is classified as a PBT (persistent, bioaccumulative, and toxic) substance. The EU has restricted the use of HBCDD due to environmental concerns.

Overall, rockwool acoustic panels are considered safe for human health based on extensive research and lack of restrictions.

Question 7: Will rock wool production process consume a lot of energy and produce a lot of emissions?

Rockwool production does require a significant amount of energy. However,  modern factories are implementing measures to reduce energy consumption and utilize renewable sources. While some emissions occur during production,  regulations ensure they meet environmental standards.

The key benefit lies in the long-term energy savings achieved by using rockwool for building insulation.  Over its lifespan, a rockwool panel can save much more energy than was used in its production. Additionally, rockwool is made from readily available basalt, unlike polystyrene which relies on fossil fuels.

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