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Cae Duff - Project Team

  • Services - Alan Clarke tel 01594563356
  • Structures - Allan Pearce tel 01531670766

Passivhaus windows and doors/ventilation system - Green Building Store

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We were commissioned to begin design work on a new Passivhaus in January 2014.

The clients brief was for us to design a high quality home for comfortable, low cost living. The site was located on a next door garden plot, the neighbouring cottages forming the edge of Garway Common.

From an early stage we liaised closely with the local authority planning department to explore design and material options to integrate a new house into the context of the immediate surroundings of the existing village of Garway.

Working with the main contractor in the planning phase we developed a scheme and detail design package which would be cost effective and buildable to passivhaus standards and to a tight budget and delivery programme.

Living, cooking, eating and sleeping spaces have been designed to flooded with daylight whilst avoiding overheating.

Similar to a tea cosy the house fabric is insulated all round, including from under the floor slab and connecting to the walls and roof which are full filled with recycled newspaper insulation

With rigorous attention to detail the task of making the external shell airtight became a straightforward task for the contractor.

By making the fabric as airtight as possible means energy loss is reduced significantly. Airtightness is tested at the completion of the building shell.

Controlled ventilation is provided with the use of a whole house ventilation system with heat recovery. Heat energy is extracted from the kitchen and bathroom areas and recovered to warm up incoming external air.

Throughout the design process we analyse and adjust the detail and design of the house with the use of specialist thermal analysis computer software to monitor overall energy performance and key details such as wall/roof junctions.

Air tight window details developed in 3D using CAD Software

Wrap around insulation(yellow hatch) within the building fabric and under the slab - similar to a tea cosy. Careful attention is made to ensure air tightness and wind tightness layers are pre planned at the detail stage.


Thermal analysis of timber frame construction detailing. Key details to be analysed are junctions between roof and wall, wall and first floor, wall and ground floor, ridge connection

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