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Taking the Devil out of the Detail?

An evaluation of ψ–values for Kingspan Kooltherm Cavity Closer

The effects of linear thermal bridging around openings can lead to condensation on cold reveals, mould growth and eventual deterioration of plaster, wallpaper and / or paintwork. Kingspan Kooltherm Cavity Closer provides a simple and effective method for closing cavities around openings in masonry and steel framed cavity walls. Its thermally efficient, rigid thermoset phenolic insulation core inhibits heat transfer, and thus reduces linear thermal bridging in these locations.

In order to demonstrate the effectiveness of Kingspan Kooltherm Cavity Closer, we commissioned BRE Scotland to carry out a thermal modelling study of jamb details for differing cavity wall constructions, where the cavity is closed using Kingspan Kooltherm Cavity Closer. The modelling drew on a number of key influencing factors to identify a worst-case scenario. The resulting psi-values shown in the white paper are valid for a broad range of constructions and can be used as a “safe approximation” for various frame depths and overlaps on both jambs and sills, assisting designers by allowing a one–size–fits–most approach.

By installing Kingspan Kooltherm Cavity Closers, rather than sticking with the ACDs and associated psi-values, it is possible to easily achieve significant reductions in thermal bridging. With energy performance becoming an ever-greater priority in building design and construction, it is crucial that installers ensure all detailing is carried out correctly.

By using products like Kingspan Kooltherm cavity closers, and paying careful attention to details, it should be possible to limit thermal bridges and create buildings which deliver on their energy performance promise.

Download the technical bulletin

Taking the Devil out of the Detail

Find out more about Kooltherm Cavity Closers

Kingspan Insulation Ltd

For queries relating to insulation boards, cavity closers or membranes.

Pembridge

Leominster

Herefordshire

HR6 9LA

General enquiries: 01544 388 601

Technical advice: 01544 387 382

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