Improving Energy Efficiency in Historic Cornish Buildings. Camborne, Roskear, Tuckingmill Townscape Heritage Initiatives

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1 Improving Energy Efficiency in Historic Cornish Buildings Andrew Richards Cornwall Council Camborne, Roskear, Tuckingmill Townscape Heritage Initiatives

2 Heritage Assets in Cornwall Designations Cornwall has the largest number of statutorily protected heritage assets in the UK 1,345 scheduled ancient monuments 12,552 listed buildings 145 Conservation Areas covering 4411 hectares 37 registered parks and gardens 8 designated wrecks 3 registered battlefields World Heritage site of 18,222 hectares covering 5.5% of Cornwall Approximately 35% of Planning applications affect a designated heritage asset Heritage at Risk 829 buildings are on national heritage at risk registers (grade I and II* and scheduled monuments) There are 11,874 grade II listed buildings not on registers CORNWALL

3 Heritage Projects in Cornwall Cornwall Council Historic Environment staff have successfully bid for and managed heritage led regeneration schemes in 12 historic Cornish towns between 1998 and 2015 including: Scheme Camborne, Roskear, Tuckingmill THI Phase 2 ( ) Camborne, Roskear, Tuckingmill THI Phase 1 ( ) Common Fund 666, ,048, Buildings funded Helston THI ( ) 854, Redruth HERS ( ) 1,203, Penzance THI ( ) 2,329, Hayle THI ( ) 2,992, Penryn THI ( ) 1,340, Falmouth HERS ( ) 932, Redruth CAPS / Town Scheme ( ) 184, m of Cornwall Council funding contribution to these schemes has created 25m of investment in the historic towns and areas including 8.2m of private investment. THI funded renovation of 27 Basset Road, Camborne.

4 Examples of THI funded projects in Cornwall THI schemes fund quality traditional repairs using local materials. With the help of historic research, they restore lost architectural features and bring empty historic buildings back into use. THI funded renovation of two adjoining shops, Trelowarren Street, Camborne. THI funded renovation of existing shop and creation of new flats, Meneage Street, Helston.

5 Traditional Skills Training Traditional skills training initiatives have been funded and organised by the THI for local builders, architects, property owners and college students. This training is often hands on as part of live projects. Further detailed information: Camborne, Roskear, Tuckingmill Townscape Heritage Initiatives

6 Traditional Joinery Repairs The THI has: funded traditional timber repairs on historic buildings provided training for local contractors and college students in traditional timber construction and repair techniques The principle is to repair rather than replace original building fabric and then highlight ways of improving thermal and noise performance leaving original detailing intact. This is important as many local carpenters often prefer replacement over repair. Sash window production by Cornwall College students Traditional scarfing repairs to historic sash window Demonstration of resin repair techniques to traditional joinery

7 Monitored energy saving initiatives funded by the THI Good practice energy saving measures are being installed on THI funded historic buildings. Energy performance is being monitored and recorded by students from Cornwall College s BSc Renewable Energy and Carbon Management course through: Remote temperature sensors fixed internally and externally. Thermal imaging. Acoustic monitoring equipment. Monitoring is conditioned on THI grant offers and involves: 1-2 week agreed monitoring period after completion of works and before occupancy of building. 12 month monitoring period to take account of seasonal change. An interview/perceptions questionnaire for occupants at the end of the monitoring period. Image of remote temperature sensor installed over doorway Thermal imaging, Penlu, Tuckingmill

8 Monitored Energy Saving Initiatives Two adjoining historic buildings at the former Holman s Engineering works, Camborne were converted to residential accommodation. Both buildings were split into multiple units and subtly different methods of improving the thermal and noise performance of traditional windows were installed. This allowed a comparison of the measures as well as a visual analysis. Slim double glazing Sheepswool insulation to roof 2 draught proofed single glazed windows with internal shutters Before 5 draught proofed single glazed windows with thermal shutters 2 draught proofed single glazed windows 3 Single glazed windows with secondary glazing Insulation between first floor timber joists inserted from above floor

9 Examples of THI funded energy saving measures in Camborne Internal timber shutters Slim double glazing Secondary glazing Breathable internal wood fibre insulation

10 Acoustic Monitoring Specification R w R w+c R w+ctr Single glazing with draught proofing Single glazing with secondary glazing Single glazing with thermal shutters Slim double glazing Typical double glazing Typical single glazed window The higher the figures in the table above the better the noise performance. Key findings from the monitoring were: Regular idling traffic and passing trains provided a good noise monitoring opportunity at the former Holman s No.3 Works, Trevu Road. Secondary glazing and thermal shutters performed well with results comparable to double glazing. Draught proofed single glazing results were comparable to slim double glazing. Draught proofing provided a significant increase to the noise performance of single glazed windows.

11 Improving Energy Efficiency in Historic Cornish Buildings guide

12 Improving Energy Efficiency in Historic Cornish Buildings guide 3.8 Trickle ventilation A trickle vent is a small opening on a window or door which allows internal spaces to be naturally ventilated when windows or doors are closed. On new windows this normally involves cutting a ventilation slot through the top frame. This can look unsightly on traditional sash windows. It is possible, however, to provide neat, discreetly concealed trickle vents by cutting a vent slot in the underside of the top case of the sash and venting through the top case as shown in the sketch and photographs on this page. For new build dwellings or extensions please refer to Approved Document F of the Building Regulations. Chamfered termination to slot in top sash Front elevation Fixed insect mesh Neat slot cut from outer face of top sash and through case Trickle ventilation cut through top case of sash window. Hit-and-miss trickle vent to inside of sash Inside Outside Main contents Section through box sash window Window stops above the meeting rail on traditional sash windows provide security whilst allowing ventilation. 20

13 Conclusion The traditional skills training and energy saving initiatives funded through Camborne, Roskear, Tuckingmill THI have provided the following results: 21 skills training events for 470 local builders, architects, Council staff and college students 95 Local college students have been given the opportunity to work on live local building schemes Traditional skills including joinery, metalwork, masonry construction and timber repair have been included as part of Cornwall College building courses Energy monitoring has been included as a module on renewable energy and carbon management courses A list of local builders and suppliers has been compiled from builders and suppliers involved with successful THI work and attendees at training events Further training sessions in lime plaster, rot eradication, lime/cork insulating plaster and hemp plaster are planned for 2015 Good practice energy saving measures installed on 21 local housing units, 2 community buildings and 1 commercial unit The Improving Energy Efficiency in Historic Cornish Buildings guide has been formally endorsed by Cornwall Council as a material consideration for land use planning purposes and can be downloaded from Cornwall Council s web site: The guide is being used to discuss insulation methods with builders carrying out comprehensive improvements to local housing as part of Government funding programmes. It is referred to in pre application applications to Cornwall Council s Planning Service and links to wider local policy and guidance through: Sustainable Energy Action Plan (SEAP), Cornwall Design Guide, Sustainable Buildings Guide