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Pennington Wharf

The Pennington Wharf development is being built by Taylor Wimpey on land once occupied by Bickershaw Colliery

The Project

The Pennington Wharf development is being built by Taylor Wimpey (TW) on land once occupied by Bickershaw Colliery which closed in 1992.
The development of 471 sustainable homes, facilitated by the Homes and Communities Agency (HCA) is fully compliant with code level 4 in the now withdrawn Code for Sustainable Homes.
 

Location:
Leigh
Client:
Taylor Wimpey
Build System:
ULTIMA with TEK roof

Build

TW’s first phase was constructed in masonry combined with sustainable technology (PV) to ensure compliance. In discussions with Kingspan Timber Solutions (KTS) TW wanted to explore the potential for a solution to code 4 energy performance without reliance on PV, MVHR or non-standard specification windows whilst maintaining the external wall zone on the TW core range house designs.

KTS demonstrated that code four could be achieved with the Kingspan patented ULTIMA system utilising a 50mm Kooltherm liner. For the two and a half storey designs the ULTIMA system was combined with a TEK roof to preserve the high performance envelope. External wall thickness, including brick and plasterboard, was only 338mm which allowed room sizes to be preserved.
 

Code 4

The Code for Sustainable Homes level 4 target scores were achieved with standard double glazed windows, DMEV air extraction, WWHR and standard condensing gas boilers combined with a design air tightness of 5m3/m2.hr. In addition ULTIMA also allowed TW to reduce the floor slab performance from Jet floor to a simple 75mm of Kooltherm K103.
The excellent thermal bridging performance of Ultima reduced the typical y value from 0.05 in masonry to 0.034 in ULTIMA.

Post construction testing has shown very little variance in as built air tightness.

The 38 dwellings on Phase 2 were built comfortably within a 6 month period.

The ULTIMA system benefits from good performance for both U values and Psi values alongside good air tightness making it ideal for so called “fabric based” energy solutions that do not rely on technology to provide low running costs to occupiers.
 
Code 4 Compliance
Although the Code for Sustainable Homes is withdrawn, it is not unusual for clients or planners to still specify compliance with the code.
The code required a minimum score to be achieved by earning weighted credits against various parameters. For energy the key ones are:
  • Dwelling emission rate (ENE1) 10 credits available.
  • DER / TER > or = to 19% betterment for code 4 (mandatory) (using SAP 2013).
  • Fabric Efficiency (ENE2) 9 credits available.
  • DFEE / TFEE fabric efficiency.
  • Low & zero technology (ENE7) 2 credits available.
  • Technology like PV.
Mandatory code 4 requires the award of 3 credits minimum under ENE1.
As a guide, without renewable technology (ENE7), Parameter ENE 2 scores need to be 6 or above.
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