Skip to content
Home » Mastering the Art of Thermal Bridge Calculations: A Step-by-Step Guide

Mastering the Art of Thermal Bridge Calculations: A Step-by-Step Guide

The reduction of thermal bridges is a vital component that is frequently disregarded in the development of energy-efficient buildings. A thermal bridge is a region of a building’s exterior with a faster rate of heat transmission than the materials around. Designing and building energy-efficient structures requires a thorough understanding of thermal bridges as well as precise calculations of their effects. This article will examine the importance of thermal bridge calculations and how they contribute to the design of environmentally friendly structures.

Thermal Bridges: What are they?

When materials with various thermal characteristics come together or if there is a gap in the insulation of the building envelope, thermal bridges can form. Heat may go through these places with the least amount of resistance, which increases energy use and reduces thermal comfort inside the structure.

Methods for Calculating Thermal Bridges:

The foundation of this strategy is the simplification of intricate construction elements into 2D calculations. It offers a practical heat loss calculation and is frequently applied during the initial design stages.

3D numerical simulation: This approach simulates the heat flow through the building envelope using sophisticated software, such as finite element analysis (FEA) or computational fluid dynamics (CFD).

Calculations of the Thermal Bridge are Important:

Thermal bridges may have a major influence on a building’s overall energy efficiency. Designers and architects may minimise heat loss or gain and hence lower the building’s overall energy consumption by precisely estimating and managing these bridges.

Thermal Comfort: Unaddressed thermal bridges frequently cause temperature swings and cold areas in buildings, making inhabitants uncomfortable. An improved interior environment that is healthier and more productive is promoted by proper thermal bridge calculation and mitigation.

Condensation and moisture control: Thermal bridges may also exacerbate condensation issues inside a structure, which can result in mould development, corrosive conditions, and structural damage. Calculations assist in locating probable condensation sites, enabling designers to take the necessary precautions to avoid moisture-related problems.

Durability of the structure: Thermal bridges can hasten the deterioration of building parts like structural components or interior treatments. The lifespan of the structure may be increased and maintenance and repair expenses can be decreased by identifying and fixing these bridges during the design process.

Standards and Regulations:

Many nations have put standards and laws in place to ensure energy-efficient buildings after realising how important it is to reduce thermal bridging. For instance, the Energy Performance of Buildings Directive (EPBD) of the European Union mandates that member states carry out estimates and mitigation strategies for thermal bridges.

Technologies and tools:

There are several tools and software programmes that can help with thermal bridge calculations. These technologies simulate heat movement using sophisticated algorithms and provide designers precise information to improve the thermal performance of the building exterior. THERM, HEAT2, and WUFI are a few examples of this kind of software.


Calculating thermal bridges is crucial for developing energy-efficient structures. Designers may improve energy efficiency, encourage thermal comfort, avoid condensation issues, and guarantee the lifespan of the building by precisely identifying and reducing thermal bridges. Regulation adherence as well as the utilisation of cutting-edge digital technologies substantially facilitate this procedure. The importance of using thermal bridge calculations in building design will increase as the globe continues to place a high priority on sustainability and energy efficiency. By doing this, we may design buildings that are both visually beautiful and ecologically responsible in the future.