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Thermal Insulation Assessment at Knole House, Sevenoaks

Following on from our work with SPAB on insulating old buildings, we advised architects Purcell on the best method of upgrading walls and roofs at Knole House, as part of repair and improvement work being undertaken by The National Trust.

We undertook U value and interstitial condensation calculations, using weather data gathered on site over the last 2 years.

As with all historic buildings, preservation of the fabric is the main priority.  In some cases introducing insulation would increase the interstitial condensation risk, in which case it is better to avoid insulating. This shows the importance of careful analysis.

Selecting the appropriate materials and carrying out the work to a high standard are equally important.