A Guide on Cavity Wall Insulation
Find out how your choice of insulation can impact cavity walls.
Knowledge Article10 min read
London Square Orpington, a gated development of 58 private three and four bedroom houses, is set in 6.3 acres of idyllic green space within easy commuting distance of the capital.
Inspiration for the design of the new properties has been taken from the traditional architecture of Bassetts House, a locally-listed mansion on the edge of the site which has been sensitively restored by London Square to become 32 private one and two bedroom apartments.
LOCATIONKent, UK
ArchitectStanford Eatwell Technical
ProductsKooltherm K106 Cavity Board
To ensure the homes are energy efficient and warm, the project team sought to surpass the Building Regulations. This led to the specification of 4700 m2 of Kooltherm K106 Cavity Board for the new-build elements.
Kooltherm K106 is part of our Kooltherm 100 range of premium performance insulation boards which boast a thermal conductivity of just 0.19 W/mK across all available board thicknesses. In addition to its inherently outstanding thermal performance, Kooltherm K106 also features a water–tight, vapour–open polypropylene fleece outer facing which protects against moisture penetration. As a result, it can be installed with a void of just 10 mm, limiting the thickness of the external walls.
"The ethos of this project was to ensure that passive measures are adopted prior to the application of high efficiency or renewable technologies wherever feasible. The use of premium performance insulation, such as Kingspan Kooltherm K106 Cavity Board, within the building envelope and careful detailing to limit thermal bridging will reduce winter heat loss and consequently the required heating energy".
Roger Hind - Director, Stanford Eatwell Technical
In addition to delivering excellent thermal performance the buildings are also very airtight, with a design air permeability target of 3 m3/h/m2 @ 50 Pa for the flats and 5 m3/h/m2 @ 50 Pa for the houses.
Mechanical Ventilation Heat Recovery systems are fitted in all the properties. The systems use the heat from outgoing stale air to warm incoming fresh air. This helps to maintain a comfortable internal environment and further reduces heating demand.
Page updated - 01/04/2026
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