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What is a thermal bridge and why is it important?

Thermal bridges are parts of the building envelope where more heat is lost than elsewhere. Depending on design and implementation, heat loss through thermal bridges accounts for between 10 and more than 30 % of overall heat loss.

The main consequences of thermal bridges are:

• an increased thermal energy requirement due to cooling via the thermal bridges
• lower surface temperature on the inside of the wall
• condensation in this area, leading to mould developing

Mould developing in corners that form thermal bridges (source: GrAT)