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The Greenhauses

London's largest Passivhaus development.

The Project

For this project, the developers Octavia Housing aimed to build two five-storey apartment buildings (Blocks B and C), a row of three-storey terraces (Block A), and four mews houses with roof terraces (Block D) in Sulgrave. They appointed Cartwright Pickard were chosen to design the project, christened The Greenhauses, who designed Blocks A and B to meet full Passivhaus certification.

Location:
London
Build System:
Kingspan TEK
One of the main aims of the project was minimising the thickness of the wall build ups, whilst maintaining excellent levels of thermal performance, because the site is situated in a relatively tight urban area.
 
To this end, the design specified the Kingspan TEK Building System for Block A and D’s external walls, and the Kingspan TEK Cladding Panel for Block C and D’s concrete frames. Kingspan Timber Solutions was responsible for designing and cutting these two products to fit the dimensional requirements. This offsite method created minimal site waste and a reliable installation time.

A breather membrane was stapled to the outer face of Block A’s Kingspan TEK Building System. This was followed by a 90mm-thick Kingspan Kooltherm K12 Framing Board, leaving a 50mm cavity between the wall build up and the 102.5mm brickwork facing.
 
On the internal side, an airtight membrane was taped to the face of the Kingspan TEK Building System, which was then followed with a 25mm service zone and two layers of 15mm plasterboard lining.
 
Block B’s Kingspan TEK Cladding Panels fixed to the concrete slab floor using angled cleats. The wall build up of Block B mirrored that in Block A; airtight tape was used to seal the airtight membrane was to the concrete frame and soffits. In specific areas of the exterior, aluminium composite facades were used, and installed on aluminium brackets fixed to timber battens.
 
The build ups of both Blocks achieved outstanding thermal performance; the final U-value of their external walls was 0.10 W/m²K. Two 100 mm layers of Kingspan Kooltherm K3 Floorboard were also installed on the ground floors of all four blocks, which achieved the same thermal performance as the external walls and fulfilled the brief for excellent thermal performance.
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