26/08/2026
Building Better: What is a U-Value?
If you’re looking at energy efficiency, insulation or BER, you’ll often come across the term U-value — but what does it actually mean?
A U-value measures how easily heat passes through a building element, such as a wall, window, roof or door.
The lower the U-value, the better the insulation.
For doors and roller shutters, a lower U-value means less heat is transferred through the door, helping a building retain heat during colder months and reduce unwanted heat gain when it’s warmer.
This is particularly important for commercial and industrial buildings, where large door openings can have a significant impact on overall energy performance.
When selecting a door, factors such as:
🔹 Insulated profiles
🔹 Construction and materials
🔹 Seals and weather protection
🔹 Correct installation
🔹 The size and frequency of door operation
can all contribute to its overall thermal performance.
At Paramount 26 IREL LTD, we understand that choosing the right door is about more than security and access. Thermal performance and energy efficiency matter too.
Our Building Better: Energy Efficiency Matters series continues next time with another important question:
What is thermal bridging — and why does it matter?
