Ulva Ferry Community Housing
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as PDF Two three-bedroom homes for Ulva School Community Association, in Ulva Ferry, on the Isle of Mull.
Ulva Ferry Community Housing : 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 | - | 3925.4 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 48 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 11 kg CO₂/m².yr | - |
| Annual space heat demand | - | 17.51 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 48 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 11 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Silver |
| Other energy targets | - |
| Forecast heating load | 11.06 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 05 December 2016 | 0.455m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 04 April 2017 | 0.378m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 12 August 2016 |
| Occupation date | 01 June 2017 |
| Location | Ulva Ferry, Isle of Mull North west Highlands Scotland |
| Build type | New build |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Other |
| Other construction type | Cross-laminated timber structural panels |
| Party wall construction | |
| Floor area | 206.6 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  AECB silver standard certified building |
Project Team
| Organisation | Thorne Wyness Architects |
|---|---|
| Project lead person | Thorne Wyness Architects |
| Landlord or Client | Mull and Iona Community Trust |
| Architect | Jenny Wyness |
| Mechanical & electrical consultant | Ferguson Energy |
| Energy consultant | Thorne Wyness Architects |
| Structural engineer | David Narro Associates |
| Quantity surveyor | Allied Surveyors Scotland |
| Consultant | PAUL Heat Recovery Scotland |
| Contractor | Norman Macdonald Builders |
Design strategies
| Planned occupancy | Five people per house: two adults and three children. Children and one of the adults out to school on weekdays. |
|---|---|
| Space heating strategy | Heating from one storage heater located in the living room and an electrical towel rail heater located in the bathroom. Heat recovered from ventilation exhaust. |
| Water heating strategy | Solar hot water (high-performance flat plate collectors) and hot water cylinder with electric resistance back-up. |
| Fuel strategy | Mains electricity. |
| Renewable energy strategy | None. Island has it's own Hydro generation scheme. |
| Passive Solar strategy | Generous glazing areas facing south. Window proportions optimised using PHPP. Solar thermal hot water installation. |
| Space cooling strategy | MVHR with summer by-pass. Possibility of natural ventilation during heat waves. |
| Daylighting strategy | All kitchens achieve a minimum average daylight factor of at least 2%.All living rooms, dining rooms and studies achieve average daylight factor of at least 1.5%. |
| Ventilation strategy | Comfort ventilation with heat recovery (winter). Openable doors and windows (summer). |
| Airtightness strategy | Airtight membrane on structural cross-laminated timber panels (walls and roof panels). Joints between structural panels seal using high-quality airtightness tapes. Air tightness membrane. |
| Strategy for minimising thermal bridges | External continuous insulation maintained throughout. Rigid external insulation on structural cross-laminated-timber wall and roof panels, and under-slab insulation. THERM analysis and psi values calculation undertaken for all primary junctions interfaces: external corner, eaves, ground floor junction, gable, roof party wall, ridge, internal corner, and window head, jamb and sill. |
| Modelling strategy | Whole house modelling was undertaken in PHPP. |
| Insulation strategy | Rigid external insulation on structural cross-laminated-timber wall panels to achieve U-value of 0.15 W/mK. Rigid external insulation on structural cross-laminated-timber roof panels to achieve U-value of 0.10 W/mK. Under-slab insulation o achieve U-value of 0.135 W/mK. |
| Other relevant retrofit strategies | No applicable. |
| Contextual information | The houses have a private bore hole water supply and drainage to septic tank and infiltration field. |
Building services
| Occupancy | Five people per house. |
|---|---|
| Space heating | Heating from one storage heater located in the living room and an electrical towel rail heater located in the bathroom. Heat recovered from ventilation exhaust. |
| Hot water | Solar hot water (high-performance flat plate collectors) and hot water cylinder with electric resistance back-up. |
| Ventilation | Comfort ventilation with heat recovery (winter). Openable windows (summer). |
| Controls | Touch screen control for MVHR system in hallway. |
| Cooking | Electric hob to be provided by tenants. |
| Lighting | Low-energy lights. |
| Appliances | All white goods to be provided by tenants must be A-rated or better. |
| Renewable energy generation system | Solar hot water (high-performance flat plate collectors). |
| Strategy for minimising thermal bridges | Psi values have been calculated for internal and external values for: external corner, eaves, ground floor junction, gable, roof party wall, ridge, internal corner, and window head, jamb and sill. External psi-value have been entered into PHPP. |
Building construction
| Storeys | 1 |
|---|---|
| Volume | 517m³ |
| Thermal fabric area | 783 m² |
| Roof description | - Build-up: SOLITEX PLUS CONNECT breather membrane on 18mm OSB fixed with 4mm dia. x 250mm long partly threaded screws with min 50mm embedment into the CLT with 500x500 ccs on 180mm Kingspan Kooltherm K7 rigid insulation on Intello Plus air tightness membrane and vapour check on 120mm Cross-Laminated Timber panel EGO_CLT 120 forming main roof structure/ 78mm Cross-Laminated Timber panel EGO_CLT 78 forming kitchen roof structure with180mm Kingspan K7 rigid insulation. - Cladding: Traditional 3" corrugated cladding 0.7mm thick PVC Plastisol coated galvanized steel on 50x50mm horizontal battens on 5mm thick acetal plastic spacers cut from 25mm dia. rod stock on Build-up. |
| Roof U-value | 0.10 W/m² K |
| Walls description | - Build-up: SOLITEX FRONTA HUMIDA breather membrane on 120mm Kingspan Kooltherm K12 rigid insulation on Intello Plus air tightness membrane and vapour check on 78mm Cross-Laminated Timber panel EGO_CLT 78.- Cladding: 27mm natural Scotlarch board on board timber cladding on 25x50mm horizontal battens on 25x50mm vertical battens or Traditional 3" corrugated cladding 0.7mm thick PVC Plastisol coated galvanized steel on 50x50mm horizontal battens on Build-up. |
| Walls U-value | 0.15 W/m² K |
| Party walls description | 2No. 78mm Cross-Laminated Timber panel EGO_CLT 78 forming party wall with 2x60mm Rockwool RWA 45 to provide medium duration fire protection between the panels. Panels finished with 12.5mm plasterboard on each side.TESCONVANA tape to seal panels for air tightness between wall and roof panels. |
| Party walls U-value | - |
| Floor description | 150mm Type 1 hardcore sub-base with 50mm sand blinding, DPM and 250mm Filcor 45 unser-slabinsulation. 200mm concrete slab, and 2No. 22mm particle board as floor finish. |
| Floor U-value | 0.14 W/m² K |
| Glazed doors description | Rationel Triple glazed AURA Entrance doors with glass (fillings) 4-20-4-18-6,4 Energy/Clear/Energy WE with Argon (1). TESCON PROFIL tape to seal window frame to CLT panel for air tightness. |
| Glazed doors U-value | 0.87 W/m² K uninstalled |
| Opaque doors description | No applicable. |
| Opaque doors U-value | - uninstalled |
| Windows description | Rationel Triple glazed AURA windows with glass (fillings) 4-20-4-20-4 Energy/Clear/Energy WE with Argon (1), resting on 87x50mm timber buttress with EXTOSEAL ENCORS tape to seal window sill to CLT panel for air tightness and TESCON PROFIL tape to seal window frame to CLT panel for air tightness. |
| Windows U-value | 0.82 W/m² K uninstalled |
| Windows energy transmittance (G-value) | 0.5 % |
| Windows light transmittance | 0.7% |
| Rooflights description | No applicable |
| Rooflights light transmittance | - |
| Rooflights U-value | - |