First Free Online 3D U-value Calculator Launched

THE UK’S first free online 3D U-value calculator has been launched, allowing architects to instantly generate more accurate U-values for steel frame rainscreen façade specifications.

The tool, made available by Knauf Insulation, is designed to help architects more closely reflect as-built performance in their designs and avoid costly over-specification.

“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,” explains Bradley Hirst, Technical Services Manager at Knauf Insulation.

Online 3D U-value Calculator

Standard U-value calculations for rainscreen façades assume a default bracket configuration, applying a blanket correction factor for the build-up. This can lead to specifying needlessly thick insulation or result in a gap between designed and actual performance.

The 3D U-value calculator works from the architect’s actual design to provide a more accurate result.

With regulations becoming increasingly stringent, the calculator helps architects ensure compliance by delivering a design more likely to perform as intended in the real world.

The calculator also creates a detailed report that helps to meet regulations and protect the specification by showing the potential impact of inappropriate substitutions.

Instant Access

Brad added, “We’re always looking for ways to make it as easy as possible for architects to design buildings that perform in the real world. In time, we plan to add masonry and reinforced concrete rainscreen façades to the tool, so that architects have instant access to 3D U-value calculations for a broader range of applications.”

This is the latest in a series of innovations developed by Knauf Insulation to support rainscreen performance in the real world. In 2024, the manufacturer launched Rocksilk^® RainScreen FFCB, the first cavity barrier that is fixed to the face of the insulation, and Rocksilk^® RainScreen Slab EE, the UK’s first rainscreen slab with a water-repellent facing.

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