Energy passport
All buildings that have been constructed or reconstructed after 30 September 2012 must hold energy passport. Energy passport is a certificate which contains data on building's energy class which indicates the final annual energy consumption used for heating. Buildings are classified according to their energy efficiency class ranging from A+ for the lowest energy consumption (≤15 kWh/m²a) to G (>250 kWh/m²a) for the highest energy consumption.
In addition, this certificate contains data on climate, thermo-technical systems and elements of thermal insulation layer. You can analyze everything about insulation, installed windows, detailed calculation of energy consumption which allows you to prepare and review the estimated costs prior to moving in. Investor may not obtain building nor use permit without the passport. It is valid for 10 years.
Thermal insulation
Thermal insulation might be having the most important role in efficient energy consumption and cost savings. Besides their main function to prevent heat loss, insulation materials also prevent heat from entering during hot weather, to reduce outside noise and create a barrier against unfavorable weather conditions, humidity and wind.
External wall insulation may be installed during construction. This is the most efficient solution since insulation material is installed straight into the wall. Lifespan of quality insulation installed during construction lasts as long as the building itself. There are several types of insulation materials, however, expanded polystyrene foam and mineral wool are most commonly used.
Mineral wool has numerous advantages primarily because it is vapor-permeable and ensures excess moisture removal which prevents mould growth. It is natural and long-lasting material made of molten rock whose droplets get dispersed into mineral fibres. This is why a facade made of it lasts as long as the building. Not only that it provides better thermal insulation than polystyrene foam but it also provides sound insulation and greater protection against fire considering it is inflammable.