U-Value
Attain RTC is able to undertake detailed thermal performance calculations in accordance with established European methodologies for building envelope components, including windows, doors and curtain walling systems. This includes assessment of heat transfer and U-values to support compliance, design validation and product development.
We can carry out calculations in line with BS EN ISO 10077-1:2017 and BS EN ISO 10077-2:2017+A1:2025 for windows and doors, as well as BS EN ISO 12631:2017 for curtain walling systems. These standards define the methods for determining thermal transmittance and component-level heat flow, enabling accurate, consistent performance data suitable for regulatory submissions, energy modelling and product classification.
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