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Low-energy single family house in Seest.

A low-energy building constructed in Seest (Denmark) in 2005 is an example of realisation of a low-cost, energy-efficient detached building. It is a well-insulated and energy efficient single-family house, ensuring a high comfort of living. The heating costs are low thanks to a low heat demand – yearly expenses are only about 260€. Why so little? Because the building is well-insulated and heat from exhaust air is recovered from building ventilation.

The technical methods applied to prevent heat losses and ensure high heating efficiency were as follows:·         
  • cutting–edge insulation using Rockwool thermo- insulating materials

                - 55 cm of roof insulation; 
                - 39.5 cm of façade insulation;
                - 20 cm of foundation insulation; 
                -  32.5 cm of ceiling insulation; 

  • three-layer low-energy windows with gas filling and coating;
  • airtight construction (infiltration 0.01/h);
  • minimisation of thermal bridges, especially between floor and foundation as well as windows and walls;
  • mechanical ventilation with accumulative heat exchanger – 90% of heat recovery from ventilation.
The façade is made of cedar wood combined with black facing slabs produced by one of the Rockwool Group’s companies. Unventilated wooden cassettes filled with Rockwool wool provide efficient roof insulation. Non-flammable Rockwool wool along with gypsum plates protect the building from fire. The combination of mechanical and gravitational ventilation ensures optimal air quality.

All this allows for lowering heat demand and household expenses.

Hopefully, there will be more and more such houses that not only help us protect the climate, but also save money.