A newbuild project in Wiltshire aiming for energy self-sufficiency and to reduce greenhouse gas emissions has just been completed. Green Building Store’s PERFORMANCE range of triple glazed timber windows and doors were specified for the project.
The house was built on the site of a demolished building and is built on a sloping site, with three storeys on the eastern side and one storey on the western side. The basement is partially underground and is made using ICF with 300mm Kryton waterproof concrete infill, thereby negating the requirement for additional tanking. The frame of the house is engineered timber I-beam with 300mm Warmcell insulation. The house has a cold roof, with 300mm insulation and covered with a Sarnafil single ply membrane.
There are 32 SunPower solar photovoltaic panels on the roof with an output of 10kW. A Tesla battery stores excess electricity. Heating in the basement is provided by a wet heating system with radiators. Upstairs, the only heating is provided by a wood burning stove, but wiring provision has been made for electric radiators which may be retrofit installed depending upon how the house performs over the coming winter. Ventilation in the house is a passive stack system, designed by the clients with support from Encraft. The house also utilises 7500 litre rainwater harvesting system which feeds into the toilets, washing machine and outside taps.
Triple glazed timber windows & doors
Green Building Store’s PERFORMANCE range of triple glazed timber windows and doors (including entrance, bi-fold and lift & slide doors) were chosen for the project.
The clients said: “We were keen to have windows and doors made from timber, not PVC or metal. We looked at and got quotes from 5 different suppliers. We went for Green Building Store in the end because all the windows needed were bespoke and unusual sizes and Green Building Store was able to provide these bespoke windows at a reasonable cost. Most of the windows were 2.5 metres tall and half a metre wide, with some needing opening mechanisms. Green Building Store came up with solutions to enable this by using door hinges to carry the weight and help meet our design. We have really appreciated Green Building Store’s flexibility and ability to work to very bespoke requirements”
The house has now been occupied for over six months and data shows that the building is almost entirely off-grid, except during several consecutive cloudy winter days.
The clients commented: “The windows and doors are very good indeed and performing as expected and we’re really benefiting from the triple-glazed comfort effect. Solar gain is excellent but, even in the height of the recent summer, we did not experience any overheating issues. Draughts have been eliminated and the overall effect of the windows and doors completely meets our design brief.“
Case study: 2019