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Michael brogden darren evans lcbb 160517 performance versus regulation
The document outlines the proposed amendments to Part L of building regulations following a consultation by the Department for Business, Energy & Industrial Strategy in 2016. Key proposals include changes to distribution loss factors for heat networks, thermal bridging values, and hot water methodology, which aim to align compliance tools with actual building performance. The anticipated impact on the construction industry includes increased costs and timeframes for compliance calculations, along with a pressing need for better training and communication among construction teams.
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Michael brogden darren evans lcbb 160517 performance versus regulation
- 1. Part L 2016Consultation and Industry Implications May 2017
- 2. Introduction • Michael Brogden •Technical Director at Darren Evans Assessments Ltd • Dedicated Energy & Sustainability Compliance Specialists • Commercial and Domestic Services
- 3. Agenda Part L Compliance PartL Consultation Thermal Bridging Hot Water Methodology 2016 Consultation Summary Performance Gap
- 4. Part L Compliance ComplianceTools • SAP – Domestic Building Compliance • SBEM – Non Residential Building Compliance Part L Regulations • 2002 – Elemental Compliance • 2006 – Whole House Compliance (Target Emissions Rate) & Introduction of EPC’s • 2009 – Introduction of lower U Value thresholds & thermal bridging values • 2012 – Target Fabric Energy Efficiency (TFEE) introduced Better measurement of actual CO2 emissions from designed buildings
- 5. Part L 2016Consultation 2016 Consultation • Issued by Department for Business, Energy & Industrial Strategy (BEIS) November 2016 • 19 proposed amendments 1. Distribution Loss Factors for Heat Networks 2. Thermal Bridging 3. Hot Water Methodology
- 6. DLF – HeatNetworks Current Methodology • Default Distribution Factors (DLF) are used within the SAP Calculation • DLF is currently too low and is not representative of the losses seen from heat networks in practice 2016 Consultation Proposal • Increase DLF value used within SAP to make the calculation more representative of actual losses • Permit the full details of the heat network to be entered via exact product data Impact on Construction Industry • Decrease in performance of Part L compliance calculations using Heat Networks – Increasing ££ Needed
- 7. Thermal Bridging Current Methodology •Accredited Construction Details available for use within Part L calculations – Junction Heat Losses • Default Y Value = 0.15 2016 Consultation Proposal • Discontinue the use of Accredited Construction Details within Part L calculations • Increase the Y Value from 0.15 to 0.20 Impact on Construction Industry • Early consideration of thermal junction strategy within build strategy required to comply with TFEE • More junctions may need to be measured on an individual basis increasing build cost
- 8. Hot Water Methodology CurrentMethodology • Shower type not considered including electric showers 2016 Consultation Proposal • Different shower types to be considered separately Impact on Construction Industry • Shower selection will vary Part L performance based on hot water demand and electricity usage • Decrease in calculation performance will require additional design investigation and possible £££ • Part G to be increasingly incorporated within Part L increasing calculation costs and timeframes
- 9. 2016 Consultation Summary Aims •To bring the Part L compliance tools more in line with As Built performance expectations • To reduce the gap between design and construction and customer experience Industry Impact • Decrease in current Part L calculation performance driving design change and additional investment • Increase in Part L calculation timeframes through additional measures required • Potential Part L calculation cost increases
- 10. Performance Gap • Buildingdoesn’t perform as forecasted • The SAP/SBEM assessment at design stage, doesn’t represent the actual performance of the finished building • New buildings can’t be relied upon to play their expected role in the national carbon reduction plan
- 11. Contributors to thePerformance Gap • Lack of construction team training in relation to energy efficiency • Frequent labour changes • Lack of communication between • Site and design teams • Design teams and procurement • Site management and contractors • Lack of communication increases design elements being missed • Lack of awareness of quality control on site
- 12. Summary • Potential changesin Part L regulations on the horizon • Pressure on build costs through proposed calculation methodology changes • Delivery of design on site essential to achieve Part L and As Built performance • On site changes during construction need to consider energy efficiency impact • Solution – Engage a good energy assessment partner to work alongside
- 13. We can helpyou with… • SBEM Calculations • SAP Calculations • Energy Performance Certificates • BREEAM & CSH Assessments • Psi value calculations • Part G water Calculations • Thermal modelling (ventilation strategies) • Daylight Calculations • Ecological Assessments & Reports for planning & BREEAM • Ecological Landscape & Habitat Management Plans • Low Zero Carbon Feasibility Reports • Energy & Sustainability Statements & Reports • Tender bid & value engineering support • WELL Assessments • Air & Sound Testing (Domestic & Commercial) • www.darren-evans.co.uk We can support you with anything you need from concept to completion relating to building & energy efficiency compliance
- 14. Thank you –any questions? Michael Brogden Technical Director M: 07872 600670 E: michael@darren-evans.co.uk For any information on projects or enquiries, please don’t hesitate to contact me.
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