• Housing Excellence Partnering Scheme of the Year 2012
  • LABC Built in Quality Awards Finalists 2012
  • Housing Excellence Regeneration Scheme of the Year 2011
  • CIOB Construction Manager of the Year Finalist 2012
  • ROSPA 2012 Silver Award Winner
  • CAESER Scores Cruden 92% for Developing Work Force Skills
  • Leaders in Diversity Accredited
  • Reducing our carbon footprint by 5% annually
  • Investor in People Accredited Silver Status Company
  • Winner 2012 Constructing Excellence Awards - Leadership & People Development
  • Health and Safety OHSAS 18001:2007 Accredited
  • Environmental ISO 14001:2004 Accredited
  • Quality Assurance ISO 9001:2008 Accredited
  • Safe Contractor Approved
  • Positive About Disabled People Accredited Organisation
  • 70m Group Turnover in 2012
  • CSCS Platinum Status - over 90% of our staff are registered
  • Supporting Apprenticeships and Training
  • 260 skilled and qualified construction professionals employed
  • Dedicated staff volunteering scheme - Escalate in the Community
  • Winner 2012 Salford Business Awards - Community Award
Thursday 21st February 2013

Waver Tree Court, Scholars Green


Waver Tree Court, Scholars Green PictureWaver Tree Court, Scholars Green PictureWaver Tree Court, Scholars Green Picture

Demolition of an existing sheltered housing scheme and construct 12 new 2 bedroom, timber framed houses with traditional gas central heating. The initial objective for the client was to achieve a "good" rating in the Eco-Homes assessment; this was to be achieved using an insulated timber frame with a traditional brickwork envelope and a pitched tiled roof.

The heating source was to be provided by a high efficiency gas condensing boiler using traditional radiators and a hot water cylinder to provide the domestic hot water. After the contract award The Dane Housing Group and Cruden Construction entered into dialogue for the project to achieve Code for Sustainable Homes (CfSH) level 3 where the Client was keen to use a renewable energy source to provide the heating for the development.

Three companies were interviewed and presented their various heating solutions using Ground Source Heat Pumps (GSHP). The company that was selected was the national energy supplier E-On who used a Calorex GSHP system.

The system design required a 70m borehole to be drilled in the rear garden of each property in order for the ground loop collector (a length of pipe work filled with water and anti freeze) to absorb the energy, this mixture is then pass through the heat pump (a compressor) which increases the water temperature to the required level.

Ground Source Heat Pump shown housed in an external enclosure. The radiators within the dwelling were oversized by 50% due to the system operating at a lower temperature (35-55 degrees centigrade) than a traditional gas boiler.

Domestic hot water is supplied at around 65degrees C without any supplementary electrical heating backup.

GSHPs are around 400% efficient i.e. for every 4KW of energy produced it requires 1KW of energy to run the heat pump.

Supplementary data:


  • Life expectancy of heat pump 25years
  • Life expectancy ground loop 100 years
  • Installation cost of ground loop and heat pump circa £4500/ dwelling
  • Government grant per dwelling approx £1700 (providing there is no gas connected to the property) claimed by E-On
  • Anticipated running cost per dwelling £600-£650 per year (for heating & hot water) based on a 2 bedroom semi detached house.

Key contributing factors in achieving CfSH level 3


External envelope

  • Fully insulated timber frame with cavity and face brickwork
  • Insulated ground floor slab
  • Upvc windows with heat saving glazing
  • Insulated doors

Plumbing & Heating

  • Ground source Heat Pump (supplying heating & hot water)
  • Low fill baths with a 6 litres/ minute shower (max 105 litres of water /day /person
  • Aerated taps with restricted flow
  • Dual flush system toilets

Electrical

  • Low energy light fittings (internally & externally)
  • Programmable thermostats for the heating system

External

  • Provision of a shed with a facility to secure a bicycle
  • Clothes drying facility
  • Water butts for rainwater collection
  • Underground water attenuation


Other general key items

  • Secure by design accreditation (SBD)
  • Ecological enhancements
  • Communal lighting
  • Considerate contractors Scheme (CCS)
  • Insulation to 1st floor void and roof space
  • Low air leakage
  • Site Waste Management Plan (SWMP)
  • Chain of custody for materials (responsibly sourced)


The above design solutions achieved sufficient credits for the scheme to achieve CfSH level 3






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