Attic insulation with rock or glass wool – what to consider

Attic insulation with rock or glass wool is a key investment that increases comfort, lowers heating bills, and improves acoustics. However, choosing the right type of wool and manufacturer is crucial for maximum effectiveness. The market offers two main options—rock (stone) wool and glass (mineral) wool—each with unique benefits for insulating your attic.

Comparing Rock and Glass Wool

Rock wool excels in habitable attics where superior thermal and acoustic insulation matter most. Moreover, it can withstand temperatures up to 1000°C, which enhances fire safety. Glass wool, by contrast, is lighter and easier to install, making it ideal for tight spaces like narrow rafter gaps. Although it tolerates heat up to around 500°C, it remains a non-combustible option suitable for standard attic projects.

Vapor Permeability and Moisture Resistance

Both rock and glass wool allow moisture to pass through, which prevents condensation issues. Rock wool naturally copes better with humidity, reducing the risk of mold. Meanwhile, glass wool is treated with hydrophobic coatings, ensuring adequate protection against water absorption. If you need finishing products for your attic renovation, feel free to check
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Thermal and Acoustic Performance

Rock wool’s higher density offers more effective noise reduction, which is helpful if you want a quieter attic space. Glass wool, on the other hand, delivers excellent thermal insulation without adding much weight to the roof structure. Ultimately, your priorities—whether acoustic comfort, fire safety, or ease of installation—will guide the final choice.

Making the Best Decision

Choosing between rock and glass wool depends on your attic’s specifics. If you have questions about attic insulation with rock or glass wool or need logistics support,
contact us. We can help you plan, select materials, and ensure proper installation for long-lasting results. By weighing each wool’s properties—fire resistance, vapor permeability, and acoustic performance—you’ll secure a comfortable, energy-efficient attic.