Energy Efficiency

The acceleration of climate change and the rise in energy prices mean that improving energy efficiency in buildings is more important than ever.

Buildings have an enormous energy-saving potential. For example, a properly insulated home uses only 20 % of the energy that is needed to heat a standard house. 

The single most important factor in making a building energy-efficient is its insulation, which may account for as much as 75 % of the total energy reduction potential of buildings, which means approximately 460 million tonnes of carbon dioxide (CO2) a year. 

Energy-efficient buildings are classified into four categories: Low Energy, Passive, Zero and Plus Energy buildings. Passive buildings are often the optimal solution when considering the whole building lifecycle. 

The structures of an energy-efficient building are slightly thicker and more compact than those of conventional houses. In addition to insulation, the energy efficiency of a building depends on several variables, such as the total window area of the house, the amount of sunshine it gets and the kind of ventilation system it uses. 


PAROC Energywise house is a smart investment.

  • When building an energy-efficient building, the effect on the building cost of construction is only + 0 – 5 % compared to a standard building (according to VTT, the Technical Research Centre of Finland).
  • The resale price of an Energywise house is approximately 10 – 30 % higher than the price of a standard house.
  • Energywise houses can save EUR 30 000 – 50 000 over the course of 25 years (VTT’s estimate).
  • Stone wool insulation is an easy and cost-effective method for conserving energy and protecting the environment. It also cuts down on heating costs, allows fresh and healthy indoor air and makes the building more soundproof.

Stone wool is a great insulator.

  • One cubic metre of stone wool consists of 95 – 98 % of air, and it is well known that static air has very low thermal conductivity.

Stone wool has excellent resistance to water and moisture.

  • PAROC stone wool has good water repellence. It disrupts capillaries and does not absorb water. Water can force its way into slabs if enough pressure is applied. A wet stone wool slab dries quickly due to stone wool’s permeable structure.
    Short-term water absorption, WS, (Wp) < 1 kg/m² (EN 1609)
    Long-term water absorption (partial immersion), WL(P), (Wlp) < 3 kg/m² (EN 12087)
  • PAROC stone wool has high vapour permeability. Condensation does not occur within the insulation.
 Steam and water resistance in stone wool insulation