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Indoor Climate

Maintaining the ideal indoor climate

We are growing ever more attached to our buildings. As we spend more and more of our time indoors, demand is growing for a reliable and comfortable living environment, all year round. Today’s buildings provide a lot more than basic protection against cold or heat. High standards of energy efficiency, excellent acoustics to protect against noise and strong fire protection measures are expected of residential, commercial and public properties. Awareness of the importance of healthy indoor climates is also rising.

A feature of very low energy buildings is that the indoor climate is significantly better than that found in traditional buildings. The sustainable construction approach creates a tightened building envelope which loses just a tenth of the heat that is lost everyday in conventionally built houses and offices.

Setting the indoor temperature:

  • Insulation increases comfort
  • Insulation provides a healthier environment
  • Insulation protects your home from damage

Leaky cracks and joints inevitably cause uncomfortable draughts and these unwanted air flows drive up heating requirements in winter and cooling requirements in summer. Mineral wool insulation acts as a barrier and limits such unintended heat transfers. It significantly reduces energy bills.

A healthy indoor climate is about more than achieving a stable temperature: optimal air quality is also required. In a leaky building air enters in an uncontrolled way. A well-insulated home gets rid of draughts and uses automatic ventilation to provide the required fresh air.

The perceived comfort of a room depends on factors such as air temperature and humidity, surface temperatures of the floor, walls and ceiling, air flows within the room and the difference between indoor and outdoor temperatures.

Getting the mix right is important: a healthy climate is vital for our well-being, efficiency and productivity. During cold winters and hot summers properly fitted insulation delivers thermal comfort.

Alongside better and healthier indoor climates insulation also protects the building fabric against damage, extending the building’s life. When humid, warm air moves through gaps in the building shell, it can cause a lot of damage. Moisture resulting from water vapour condensing on cold, poorly insulated surfaces provides an ideal habitat for moulds and fungi. A family of four contributes up to 15 litres of moisture into the indoor air every day. This moisture must be ventilated out of the building in a controlled manner. An airtight building membrane helps to protect against damp by working as a water vapour retardant.

Non-insulated building

A lack of insulation in this building means that surface temperatures are contributing to condensation and mould problems around window frames, in the foundations, in joints, etc.

Out-door temperature: - 5° C
Indoor temperature: 20° C
Surface temperature: around 9° C

Renovated building

This house has had insulation of 200mm installed (Passive House technique) as well as new Passive House windows)

Out-door temperature: - 5° C
Indoor temperature: 20° C
The relevant surface temperatures are now above 16° C and so no condensation and mould problems occur. Humidity of 62% is no longer a problem.