Storrington
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as PDF The third of three schemes undertaken by Greenoak Housing Association and architect Jon Broome. The aim was to develop a replicable model to reduce emissions and other environmental impacts in mainstream housing by incorporating cost effective and trouble free measures. The emphasis is on reducing energy demand by creating a well insulated and airtight envelope. 4no. 4bed6person @ 93sq m 1no. 4bed6person disabled @ 101 sq m 3no. 2bed4person @ 78 sq m 4no. 3bed 5 person @ 80 sq m (2 pairs of semi detached units and 2 terraces of 4 units each.) The floor area and energy use averaged over all the dwellings has been used in this entry.
Storrington : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | 2854 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | 5805 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 161 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 34 kg CO₂/m².yr | - |
| Annual space heat demand | - | - | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 161 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 34 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | CSH 4 |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | 2.7m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | |
| Occupation date | 01 September 2009 |
| Location | Storrington West Sussex England |
| Build type | New build |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Softwood frame |
| Other construction type | |
| Party wall construction | |
| Floor area | 86 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | |
|---|---|
| Project lead person | |
| Landlord or Client | Green Oak Housing Association |
| Architect | Jon Broome |
| Mechanical & electrical consultant | |
| Energy consultant | |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | Mix of 2-4 bed dwellings. |
|---|---|
| Space heating strategy | Condensing gas system boiler feeding conventional radiators. |
| Water heating strategy | Condensing gas system boiler supply the hot water with supplementary input from 4m2 flat plate panels per house and a 250 litre thermal store. |
| Fuel strategy | Mains gas and electricity. |
| Renewable energy strategy | |
| Passive Solar strategy | |
| Space cooling strategy | |
| Daylighting strategy | The improved comfort from triple glazing meant that large windows could be installed for daylight. |
| Ventilation strategy | Mechanical ventilation and heat recovery (MVHR). |
| Airtightness strategy | Internal airtightness membrane applied to site-constructed timber frame. |
| Strategy for minimising thermal bridges | The Storrington development uses narrow studs which reduce timber fraction (25% less timber per stud). The design also includes cross battening of the 50mm battens which increase the insulation from the standard 140mm frame depth. |
| Modelling strategy | |
| Insulation strategy | |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | Varies from 2 bed to 4 bed dwellings. |
|---|---|
| Space heating | Conventional radiator heating is used, with Worcester Bosch condensing system gas boiler in each house. |
| Hot water | 2 no. Filsol FS20 flat plate panels, 4m2 per house and a 250 litre thermal store. |
| Ventilation | Greenwood Fusion HRV1 MVHR located on the ground floor, easily accessible from the entrance to the house. |
| Controls | |
| Cooking | |
| Lighting | Low energy compact fluorescent lighting was used throughout. |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | 2 |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | The roof insulation is cellulose between 300mm timber I-beam rafters, topped with bitumen impregnated fibreboard. Internally plasterboard is fixed directly to the I-beams with a vapour control layer forming the air barrier. A service void is not required as all pipes, wires and ducts are run through the open web joists of the first floor construction and wall lights only are used on the upper floor. A warm mezzanine was formed over the upper floor, providing storage space to the bedrooms. |
| Roof U-value | 0.10 W/m² K |
| Walls description | The Storrington development uses a simplified construction of 140x38 studs, lined with vapour control membrane and filled with mineral wool. Then the internal 50x50 cross battens are added to form the service void combined with 50mm mineral fibre insulation fill followed directly by the plasterboard. |
| Walls U-value | 0.15 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | The Storrington development is uses 350 I-beams at 400 centres with the flooring ply glued directly to the I-beam upper flanges (no radon barrier was required at this site). |
| Floor U-value | 0.10 W/m² K |
| Glazed doors description | |
| Glazed doors U-value | - - |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | Storrington uses Passivhaus standard windows. |
| Windows U-value | 0.80 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |