How do thermal bridges work and how can we avoid the risk of mould formation?
Let’s find out how to calculate thermal bridges and evaluate the risk of mould formation with a specific software

What do the mould stains on the walls depend on?
These types of issues are always linked to insulation design or construction errors that cause moisture transmission in various points of the structure, hence the formation of mould on walls.

How do thermal bridges work?

he problem of mould stains may depend on the total lack of insulation in walls, but paying a minimum of attention to the energy performance of buildings is easier than the cause of an insidious thermal bridge. Thermal Bridges are defined as an area or a point where the inside and the external side of a wall lacks in isolation with the consequent transmission (hence the definition of bridge) of humidity from the outside to the inside.

How can we avoid the problem of thermal bridge mould formation?

The main operational solution is to insert adequate insulation systems in order to act as an inner or outer coating or by the construction of a ventilated façade.

Using a thermal bridges numerical calculation software, linear transmittance and thermal flows can be determined in order to design the insulation layers. It’s also possible to identify any critical issues and resolve them easily.
TerMus BRIDGE is a software that allows you to calculate thermal bridges with the finite element analysis method, being the only way to calculate thermal bridges considering the materials and the shapes you need.

Let’s find out how you can design and create a thermal bridge and how to check the risk of mould formation with this software.

First of all, we’ll create a thermal bridge with the TerMus BRIDGE Wizard


Start off by creating a new project with the Wizard.

The Wizard can be activated from the Multifunction toolbar even with an active project.

Once the Wizard opens, we can choose from different predefined standard schemes. Simply choose the most appropriate thermal bridge scheme. The geometric and thermal characteristics are then defined analytically. For each data field a small legend with the relating meaning is shown with a note at the bottom right of the screen.

By clicking on NEXT, you can complete the procedure to automatically generate the model.

In the generated model the Boundaries and Reference Lengths are already defined.

To modify values and settings as defined in the Wizard, you must access the General Data tab, where you can find all the necessary information.

Mould formation risk check


As usual, for each new project the “General Data” section is defined.

After choosing the project location, simply proceed to determining temperature and humidity.

With the model now defined, the ante operam condition is calculated, and therefore considered without any insulation.
This method allows us to evaluate the correctness of the thermal bridge analytically and graphically with the iso-therms.

The Result tables allow us to get a quick idea of the mould formation risk.

With the calculation results, we can also see the isotherms. The thicker isotherm identifies the minimum temperature to remedy the formation of mould.

The possible intersection point of the isotherm with the inner face is represented immediately and gives us a very clear and straight forward assessment method.

To perform a new calculation, simply define the post-operam model and then proceed.
The minimum temperature factor and the minimum temperature of mould formation are then detected in the new condition.

Finally, the technical report with all relevant calculation results can be printed or exported.


Download TerMus BRIDGE for free!… the software solution for calculation of thermal bridges with an embedded FEM solver