New appartments, South East England

New build single block of 60 apartments, Southern England (081241).

New appartments, South East England New appartments, South East England


Brief and Targets: Obtain Level 3 of the Code for Sustainable Homes, with all electric heating, hot water and cooking, maximising floor area using ‘fairly standard’ thermal envelope qualities.
Sustainability Initiatives: Very good site management leading to high scores under the Considerate Constructors Scheme.
Results: Code Level 3 certified at Design Stage.

Energy-critical data:

Floor area: 4,060 m²
Mass: Single block of mixed-height storeys, no basement. Ground-level parking beside building
Structure: RC frame, pre-cast hollow plank RC upper floors, RC roof, ground floor screeded insitu concrete slab.

Main materials:

Walls: Brickwork outer leaf, insulation, dense solid blockwork inner leaf, cement mortar, plasterboard on battens, paint (Red facing brickwork outer skin)
Roof: Precast concrete formwork, lattice reinforcement, in situ deck, roofing, Vapour control membrane, aluminium foil (50 yrs), Insulation for warm in situ concrete deck roof (50 yrs) , EPDM single ply roofing membrane, flat, Concrete interlocking tiles, battens, counter battens, roofing felt, pitched
Floors: Ground Floor - Screeded in situ concrete slab, over insulation on polyethylene dpm laid on blinded recycled aggregate sub-base. Upper Floor - Plasterboard, 12.5mm, Cavity, Precast slab, prestressed, hollow, Bonded screed, 50mm
Windows: PVC-U window with steel reinforcement, double glazed
Air-permeability: Average per flat of <4m3/m2@50Pa
Psi-values: Default y=0.15
Insulation: GWP<5 (various)
Heating: Mains electricity using panel heater radiators
Controls: Individual radiator thermostats
Hot water: 125 litre HWC with 80mm foam insulation
Ventilation: Individual whole house MEV to each flat (SFP 0.8; efficiency 89%)
Cooling: Summer boost to ground floor flats
Renewables: PV on roof allocated to all flats and to common parts
Low E lighting: 100%

Points of Interest:

Numerous changes of Client decisions and of Project Managers, all electric with minimal insulation to maximise floor areas (and not impact upon minimum room heights), Thermal Bridge connections for balconies were calculated by the manufacturer but nevertheless broached Part L technical rules and could not be used. The Psi-values for the balcony connections were therefore entered using the default Thermal Bridge value of 1.0, an unavoidably punitive step which put pressure on the energy strategy and required additional insulation in the roof and additional PV on top of it.
"This is our first experience of working with Abba – they have been professional, constructive and helpful and we would certainly look to use them again on our next project." - Gradeview Properties

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New Build or Domestic Refurbishment? Call Abba Energy on 020 8208 8333 for expert advice on Sustainable Housing Design and Construction.