Mineral Wool.
Mineral wool has a moderate CO₂ footprint, but the energy savings it provides over its lifespan are many times greater than production CO₂. It is a climatically sound investment. Read the numbers together with function, lifespan, detailing and the specific building element.
- Carbon Footprint (GWP)
- 1.05 kg CO₂-eq/kg
- Source: ECO Platform EPD average (stenuld)
- Density
- 30–200 kg/m³
- Expected Lifespan
- 50+ years
How to use this assessment
The assessment of mineral wool is a first decision basis. Carbon numbers, density and lifespan give a point of comparison, but the material must always be read together with structure, moisture, fire requirements, detailing, maintenance and the condition of the existing building. A good material choice is therefore both a data question and an architectural judgement. The useful next step is to clarify which questions should be examined further before the material is specified in a project.
What is mineral wool?
Mineral wool is the most widely used insulation in Danish construction. It is made from stone (rock wool) or glass (glass wool) and offers good fire safety, sound absorption, and vapour permeability. Relatively easy to install and recyclable, but with a moderate carbon footprint during production.
Carbon Footprint Compared
Negative carbon footprint (green) indicates carbon storage. Data based on EPD averages from ECO Platform and estimates per EN 15804.
Typical Applications
- check_circle Roof insulation
- check_circle Facade insulation
- check_circle Floor insulation
- check_circle Attic insulation
- check_circle Fire protection
In Renovation
Mineral wool is the standard choice for energy renovation in Denmark. Retrofitting insulation in roofs and exterior walls is typically the most cost-effective investment in energy renovation, and mineral wool is easy to install for both professionals and DIY.
Questions about mineral wool
What is the difference between rock wool and glass wool?
Rock wool is made from melted volcanic rock and has better fire safety and sound absorption. Glass wool is made from melted glass and is lighter and cheaper. Rock wool is primarily used for roof insulation; glass wool for attics.
Is mineral wool harmful to health?
Modern mineral wool (post-1996) is classified as non-carcinogenic by WHO and is safe in use. During installation, a mask and gloves should be worn to avoid skin irritation from fibres.
Can mineral wool be recycled?
Technically yes — mineral wool can be melted and reprocessed into new insulation. ROCKWOOL and other producers offer take-back programmes. In practice, recycling rates are still low but growing.
What is the right thickness for a Danish house?
BR18 typically requires at least 300 mm in roofs and 200 mm in exterior walls to achieve the required U-values. Older houses with 100–150 mm can be beneficially retrofitted with additional insulation.
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