This is where the following may occur:
- uncontrolled heat loss,
- moisture condensation,
- localized freezing.
Why does this happen — and how can you prevent it?
Thermal bridge – an invisible enemy
A thermal bridge is a point where heat escapes faster than through the surrounding materials.
In the threshold area, the problem is especially severe because this is where the following elements meet:
- the interior of the building (warm and dry),
- the external environment (cold, rain, wind),
- the floor structure (connecting the wall with the threshold)
Add to this the mix of materials — PVC, aluminium, concrete, mounting foam — each with different thermal conductivity. Without proper design, a thermal bridge forms almost automatically.
Effects of a thermal bridge
For the user
- cold “creeping” up from the floor,
- moisture condensation → mould, mildew, damage,
- higher heating bills.
For the manufacturer
- worse energy performance and difficulties meeting WT2021 requirements,
- more complaints (moisture, freezing, deformation),
- the need for additional and costly corrective work.
Key elements of eliminating thermal bridges
Eliminating a thermal bridge in the threshold area requires a comprehensive design approach.
That’s why Alumaster thresholds are developed based on an analysis of materials and their thermal properties, expected operating conditions, and precise compatibility with the door system.
COMBI PLAN barrier-free threshold
- a smooth connection between the interior and exterior flooring,
- no protruding elements means greater comfort and no areas where cold can accumulate.
TPE thermoplastic elastomer gaskets
- maintain flexibility at low temperatures,
- resistant to weather conditions for many seasons,
- permanently integrated with the structure, eliminating the risk of leaks.
Layered, insulated threshold construction
- aluminium and PVC separated by low-conductivity insulators,
- effective interruption of heat transfer continuity,
- Uw value below 0.75 W/(m²K) – compliant with passive building requirements..
Effect for the user
- stable temperature in the threshold area,
- no cold or moisture at floor level,
- protection of the joinery, flooring, and finishes,
- high tightness and acoustic performance (water-tightness up to class 9A).
Effect for the manufacturer
- fewer complaints and service issues,
- easier installation and consistent quality,
- better catalogue performance parameters,
- an advantage in tender documentation and energy audits.
Thoughtfully engineered threshold — fewer errors
Thanks to their thoughtful design, Alumaster thresholds:
- eliminate thermal bridges,
- simplify installation,
- increase the durability and energy efficiency of the door,
- provide a sales advantage — because they perform not only on paper, but also in everyday use.
Do you want to eliminate thermal bridges in your doors?
Talk to our technical advisor.
We’ll show you how Alumaster thresholds can improve the thermal performance of your doors, reduce the number of complaints, and increase the value of your product.
Together, we’ll eliminate thermal bridges. With no compromises.
