new build
(clockwise from top left) The ground floor features 400mm Kore EPS insulation under 100mm reinforced concrete slab; a Siga Majpell vapour control and airtight layer protects the building against excessive moisture penetration; the 45mm service cavity fulfilled with mineral wool insulation; airtight detailing to prevent the joist ends causing avoidable infiltration; Ampatop Protecta plus membrane fitted to the roof; the timber frame structure coming together
PROJECT OVERVIEW Building type: 188.5 sqm detached two-storey timber frame house Location: Chieveley, RG20 8TP, England Completion date: October 2015 Budget: £335,000 Passive house certification: Certified Space heating demand (PHPP): 13.8 kWh/m2/yr Heat load (PHPP): 11 W/m2
SELECTED PROJECT DETAILS:
Primary energy demand (PHPP): 104 kWh/m2/yr
Architects: Gresford Architects
Environmental assessment method: Code For Sustainable Homes – Level 4
Project Manager:
Airtightness (at 50 Pascals): 0.58 ACH
Trunk Low Energy Building Passive house certifier: Warm Timber frame: MBC Timber Frame Insulated foundations: KORE Structural engineer: Tanner Structural Design Glazing: Ideal Combi MVHR: Green Building Store General fit out & contractor: Husker Ltd Electric contractor: Nightingale Electrical Building society: Ecology Building Society Thermal bridge assessor: Passivate M&E consultant: Crofton Landscape architect: New British Landscapes Airtightness products: Siga Roofing membrane: Partel OSB & sheathing boards: Coillte Panel Products Wall & roof insulation: Springvale EPS Mineral wool insulation: Knauf Thermal blocks: Foamglas
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Energy performance certificate (EPC): Energy Efficiency Rating B 84 & Environmental Impact (CO2) Rating B89 Thermal bridging: Nail plate to wall – Chi-Value = 0.00357 W/(mK) – 3.1% Total transmission heat losses. Nail plate to roof – Chi-Value = 0.00357 W/(mK) – 0.8% Total transmission heat losses. Perimeter wall/floor junction — Y = 0.030 W/(mK) – 1.0% Total transmission heat losses. Raft insulation downstand – Y = 0.070 W/ (mK) – 0.8% Total transmission heat losses. SVP – Y = 0.185 W/(mK) – 1.0% Total transmission heat losses Ground floor: 400mm KORE Floor EPS100 white insulation (EPS300 to perimeter) under 100mm reinforced concrete slab. U-value: 0.092 W/m2K Walls: 34mm Piveteaubois Pulso vertical timber cladding on battens and counter battens, on Glidevale Protect TF200 breather membrane, on 12mm Medite Vent MDF panel, on 400mm twin timber stud with Springvale Ecobead Platinum insulation, on Siga Majpell vapour control and airtight layer, on 15mm SmartPly OSB class 3 board, on 45mm service cavity fulfilled with mineral wool insulation, on 12.5mm plasterboard with 3mm skim coat finish. U-value: 0.085 W/m2K Roof: Rheinzink Prepatina graphite grey double standing seam onto 22mm plywood sheeting, on 44mm battens fixed through to joists, on Ampatop Protecta plus roof membrane, on 500mm twin timber stud warm roof fulfilled with Springvale Ecobead Platinum insulation, on Siga Majpell vapour control and airtight layer, on 15mm OSB class 3 board, on 45mm service cavity fulfilled with mineral wool insulation, on 12.5mm plasterboard with 3mm skim coat finish. U-value: 0.070 W/ m2K Windows: Ideal Combi Futura+i triple-glazed aluminium turn/tilt and fixed windows, Ideal Combi Futura+ sliding doors, Ideal Combi Nation doors. Average G-value: 0.49. Average Ug-value: 0.58 W/m²K. Average window U-value: 1.00 W/m2K. Heating system: Worcester 12i LPG boiler supplying one radiator to each room and towel rail to each bathroom. 300L horizontal hot water cylinder Ventilation: Paul Novus 300 MVHR heat recovery ventilation system – 88.7% final effective heat recovery efficiency. Shading: Young Design Build motorised external blinds providing 38% of reduction factor Z for temporary sun protection.
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