TECHNICAL ARTICLES
The nSEB concept stands out not only because of its use of renewable energy, but also because of the high level of energy savings achieved through building design and construction. One of the most critical elements in this respect is proper and effective thermal insulation. High-performance exterior wall insulation minimizes energy losses from the building, helping prevent heat loss during winter and excessive heat gain during summer. Effective insulation materials such as stone wool also provide benefits beyond thermal performance, including acoustic insulation and fire protection, thereby improving both occupant comfort and building safety.
Thermal insulation plays a key role in achieving nSEB standards. When building components such as walls, roofs, and floors are insulated in accordance with the new TS 825 standard, energy losses can be significantly reduced. For example, in Climate Zone 2, which includes Istanbul, the recommended U-value for external walls has been reduced to 0.40 W/m²K. Achieving this value may require low-thermal-conductivity insulation materials such as stone wool to be applied at thicknesses of at least 8–10 cm. In colder regions such as Erzurum, this thickness may increase to 13–15 cm. Similarly, increasing insulation thicknesses in roofs and floors can help prevent thermal bridges, providing important benefits in terms of both energy savings and the long-term performance of the building.
Thermal insulation contributes not only to comfort but also to cost efficiency. In a well-insulated building, heating and cooling systems with lower capacities may be sufficient. This can reduce initial investment costs while providing significant long-term savings on energy bills. With the new TS 825 standard, substantial reductions in the thermal transmittance, or U-values, of building components are targeted. As a result, the use of thicker or higher-performance insulation materials has become increasingly important.
Achieving nSEB standards requires more than insulation alone. Energy efficiency must be considered across all building components, including windows, frames, roofs, and floors. In addition, at least 10% of the building’s energy demand must be met through renewable energy sources. This integrated approach not only helps protect the environment but also supports the development of more sustainable living spaces. For comfortable, healthy, cost-efficient, and environmentally responsible living, the buildings of the future are already being shaped today through the nSEB approach.
What Is nSEB? The New-Generation Building Standard Becoming Mandatory in Türkiye
The rapid depletion of energy resources and growing environmental concerns have made energy efficiency an unavoidable priority in the construction industry. One of the most important steps in this transformation is the concept of Nearly Zero-Energy Buildings, or nSEB. nSEB refers to buildings with very high energy efficiency, very low energy consumption, and the ability to meet a significant portion of their energy needs through renewable energy sources. Shaped in line with the European Union’s energy efficiency policies, this approach forms one of the foundations of sustainable construction. In Türkiye, the standard is also becoming increasingly widespread. Having become mandatory for buildings larger than 5,000 m² as of 2023, nSEB requirements will apply to all new buildings larger than 2,000 m² as of April 2025.The nSEB concept stands out not only because of its use of renewable energy, but also because of the high level of energy savings achieved through building design and construction. One of the most critical elements in this respect is proper and effective thermal insulation. High-performance exterior wall insulation minimizes energy losses from the building, helping prevent heat loss during winter and excessive heat gain during summer. Effective insulation materials such as stone wool also provide benefits beyond thermal performance, including acoustic insulation and fire protection, thereby improving both occupant comfort and building safety.
Thermal insulation plays a key role in achieving nSEB standards. When building components such as walls, roofs, and floors are insulated in accordance with the new TS 825 standard, energy losses can be significantly reduced. For example, in Climate Zone 2, which includes Istanbul, the recommended U-value for external walls has been reduced to 0.40 W/m²K. Achieving this value may require low-thermal-conductivity insulation materials such as stone wool to be applied at thicknesses of at least 8–10 cm. In colder regions such as Erzurum, this thickness may increase to 13–15 cm. Similarly, increasing insulation thicknesses in roofs and floors can help prevent thermal bridges, providing important benefits in terms of both energy savings and the long-term performance of the building.
Thermal insulation contributes not only to comfort but also to cost efficiency. In a well-insulated building, heating and cooling systems with lower capacities may be sufficient. This can reduce initial investment costs while providing significant long-term savings on energy bills. With the new TS 825 standard, substantial reductions in the thermal transmittance, or U-values, of building components are targeted. As a result, the use of thicker or higher-performance insulation materials has become increasingly important.
Achieving nSEB standards requires more than insulation alone. Energy efficiency must be considered across all building components, including windows, frames, roofs, and floors. In addition, at least 10% of the building’s energy demand must be met through renewable energy sources. This integrated approach not only helps protect the environment but also supports the development of more sustainable living spaces. For comfortable, healthy, cost-efficient, and environmentally responsible living, the buildings of the future are already being shaped today through the nSEB approach.