Long Barn, Kiln Wood Cottage
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as PDF A sustainable, new-build, fully accessable single-storey dwelling in a secluded woodland location, consisting of a large living barn, and smaller sleeping barn separated with a light well / courtyard. Careful consulation with SIGA to achieve an air tightness of 0.66 ach@50pa Constructed using the following:- FRAME : EXPOSED GLU-LAM TIMBER FRAME WITH BLACK COATED TIE BARS AND STAINLESS STEEL PLATE FIXINGS IN COLLABORATION WITH TIMBER INNOVATIONS AND INCORPORATING WOOD FIBRE INSULATION - CLADDING : BLACK BOARD AND BATTEN SQ. EDGE VERTICAL CLADDING, USING PERMACHAR 'RAVEN' CHARRED TIMBER LARCH MEDIUM FIRED, BRUSHED AND OILED. - ZINC ROOFING : GUTTERLESS OVERHANG ROOFING incorporating 0.7mm VMZinc Anthra standing seam Roof coverings at 530mm centres.- WINDOWS AND DOORS : ALU-CAD HIGH PERFORMANCE TRIPLE GLAZED WINDOWS BY NORSKENN- NIBE MVHR AND ASHP
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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 | - | - | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | - | - |
|---|---|---|---|
| Annual CO₂ emissions | - | - | - |
| 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 | - | - |
| Annual CO₂ emissions offset by renewable generation | - | - |
Calculation and targets
| Whole house energy calculation method | |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Silver |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | 08 November 2021 |
| Occupation date | 31 May 2023 |
| Location | preston Hertfordshire England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Softwood frame |
| Other construction type | 140mm wood fibre insulation between studs, = 0.038 mK 80mm PIR |
| Party wall construction | |
| Floor area | 181.95 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | TAS ARCHITECTS |
|---|---|
| Project lead person | PAUL THOMAS |
| Landlord or Client | MIKE AND SUSAN KELLARD |
| Architect | TAS ARCHITECTS |
| Mechanical & electrical consultant | N/A |
| Energy consultant | ENHABIT |
| Structural engineer | PRICE AND MYERS |
| Quantity surveyor | N/A |
| Consultant | N/A |
| Contractor | BASE DEVELOPMENTS |
Design strategies
| Planned occupancy | Two people, retired couple but active social lifes and hobbies. |
|---|---|
| Space heating strategy | Heating from Air Source Heat pump with underfloor heating; Heat recovered from bathrooms / kitchens. |
| Water heating strategy | 8kw Air Source Heat Pump (ASHP), feeding a 200 litre hot water storage cylinder |
| Fuel strategy | Mains electricity |
| Renewable energy strategy | N/A |
| Passive Solar strategy | House orientated South, but enclosed with Deciduous trees, meaning that in the summer, overheating is reduced, and but potential for some solar gains in the winter. Overhang (gutterless) zinc roofs providing additional solar shading. |
| Space cooling strategy | MVHR, with natural cooling in summer, with shallow plan and good opportunity for cross ventilation. Secure light well acts as additional option for cooling. |
| Daylighting strategy | Clients specifically din't want rooflights, meaning Dual Aspect to habitable rooms were created, Kitchen and living rooms south and North facing. Daylight factors expected to be relatively high. |
| Ventilation strategy | - Comfort ventilation with heat recovery (winter)- Openable windows (summer)- Refer to space cooling |
| Airtightness strategy | - Clear communication and contractual definition in relation to importance of airtight layers needing to be continuous.- Clear and highly detailed junction drawings, setting out detail, but also sequence. - Mid point site strategy meeting with SIGA- Two test strategy to Air leakage tests. - Multiple meetings with SIGA to develop a robust strategy on membranes to include VCL/AT layer - SIGA MAJREX ONE-DIRECTIONAL AVCL SEALED WITH SIGA AIRTIGHT SYSTEM (the only Vapour control layer on the market with an increased one-directional drying functionality) Breather layer - SIGA Majcoat 200SOB (monolythical breather membranes have an increased lifespan over microporous membranes)- Where necessary, and due to complex build ups or roof overhangs, installing the breather membrane on the external side of the PIR insulation instead of draping it under the PIR at the location of the feature rafters. The places where the breather membrane will drop down and the feature membrane will penetrate the breather membrane this detail was sealed with SIGA Wigluv.- Tapes specified as Wigluv 20/40 | UV-resistant adhesive tape | SIGA and Wigluv black 20/40 | Adhesive tape with backing strip | SIGA- Timber frame contractor asked to include most of the batten installation including those on-site in their package to reduce risk of potential risk of damaging membranes if carried out by others. |
| Strategy for minimising thermal bridges | - To achieve a thermal bridge free design, multiple design team meetings between timber frame contractors, main contractors, Architects, Enhabit and Structural engineers took place. The timber frame is completely wrapped making thermal bridging more difficult. Certain details were more closely assessed.- Assessing the wall to roof junctions, having WUFI calcs done, and variables tested, due to complex roof overhangs and hybrid insulations.- At Wall to floor junctions liaising with Marmox Thermoblock to include the load-bearing heat-insulating building blocks, and significantly reducing thermal bridging at all the wall to floor junctions. Assessments were done on three variables to acheive an efficient detail using these thermally insulating Extruded Polystyrene blocks. |
| Modelling strategy | Whole house modelling was undertaken in PHPP and dynamic simulation was used to assess the impact of different parameters in relation to natural insulations such as wood fibre insulation.The result was a theoreticalal heating demand of 28.3 kWh/m2a. This result would allow compliance with the requirements of both AECB Standard and PHI Low energy building even with a Air leakage test allowance of 1.5 ach@50Pa. |
| Insulation strategy | Walls: Timber construction Insulation140mm wood fibre insulation between studs, and 80mm PIRinsulation with a U Value 0.14 W/m2 KFloor: Solid Floor with 165mm PIR insulation, U Value = 0.14 W/m2 KRoof : Timber construction 140mm woodfibre insulation between rafters with 80mm PIR U Value = 0.14 W/m2 K |
| Other relevant retrofit strategies | Sustainable drainage strategy : Neither Kiln Wood Cottage nor the site for the adjacent new barn has access to a main public sewer forthe disposal of foul waste. The new house discharges foul waste to a new bio-pure treatment tank discharging to a drainage field in the northern part of the garden. |
| Contextual information | Whilst building is orientated towards the south it is situated within a sheltered woodland environment. The site is within an old clay pit. It lies in the curtilage of a Grade II listed Lutyens building, outside the existing development area of the village. The surrounding woodlands are ecologically sensitive and are situated in the heart of an emerging Green Belt extension. |
Building services
| Occupancy | |
|---|---|
| Space heating | |
| Hot water | |
| Ventilation | |
| Controls | |
| Cooking | |
| Lighting | |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | |
| Roof U-value | - |
| Walls description | |
| Walls U-value | - |
| Party walls description | |
| Party walls U-value | - |
| Floor description | |
| Floor U-value | - |
| Glazed doors description | |
| Glazed doors U-value | - - |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | |
| Windows U-value | - - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |