Knauf Insulation launches free online 3D U-value calculator for steel frame rainscreen facades

Knauf Insulation has launched what it describes as the UK’s first free online 3D U-value calculator, aimed at providing more accurate thermal performance data for steel frame rainscreen facades. The tool enables architects to instantly calculate U-values based on their exact designs, supporting compliance with increasingly stringent building regulations and helping to bridge the gap between design intent and as-built performance.

Bradley Hirst, technical services manager at Knauf Insulation, explained that traditional U-value calculations typically apply default bracket assumptions and blanket correction factors that may not reflect the actual facade configuration. This can lead to unnecessarily thick insulation or discrepancies between designed and real-world performance.

“Ordinarily, architects might have to wait up to two days to get this information. Now they can use the tool at any time and get an instant result. And they can revise their designs as much as necessary to reach their target U-value,” said Hirst.

The calculator works from the architect’s specific design inputs to provide a more precise thermal analysis than standard calculation methods. Additionally, it generates a detailed report highlighting the potential impact of design choices or substitutions, which can help demonstrate regulatory compliance and protect the specification.

With building regulations becoming more exacting, Knauf Insulation states that this tool helps architects specify facade systems that are more likely to perform as expected in use, potentially reducing costly redesigns or remedial works.

Hirst added that the company plans to expand the tool to cover masonry and reinforced concrete rainscreen facades in future, broadening its relevance across various construction types.

The 3D U-value calculator is available for free on the Knauf Insulation website.