Rod Hughes BA Barch MCD RIBA
Director 2030 architects ltd Penrith Cumbria
Part L Where are we heading?
The Government has confirmed that from
2016 all new homes coming through the planning system must be built to a
zero carbon standard
and from 2019 all new non- domestic buildings must follow suit
How are we getting there?
What is next?
• 2013 regulations are a step on the way to full zero carbon compliance by 2016
What is Zero Carbon?
To achieve zero carbon certain Allowable Solutionswill be required to produce renewable energy,
Two optionsRoute A Local Planning Authority to develop policy using Third party providerOr Community Energy Fund. List of solutions and £ per tonne for carbon abatement Route B Private Energy FundVerification and Certification Scheme (ASVCS) to show investment will achieve carbon reductionAllowable Solutions Fund Holding to provide secure ”bank”
Cost of Zero Carbon Home
Priorities
Meet commitments of Climate Change Act 80% of 1990 levels by 2050Make carbon reduction affordableEncourage and re-vitalise building industryEnsure complianceDevelop resilient building industry
2013 Likely Proposals Domestic
New SAP calculation method ( now released)
Introduction of Fabric Energy Efficiency Standards FEES combined with
Carbon Compliance StandardsConsequential improvements ( approx 10% of cost) for Homes triggered by notifiable building work
Improved standards for new thermal elements in existing buildings
Owner operation manual
Non Domestic
New SBEM calculationNon domestic. Differentiated standards to remain but either11% through fabric and service improvementsor
20% improvement as above with PV array of 1.6% of floor area
SAPNew SAPc programme now available
Proposed that design stage and completion stage SAP calculationsSubmitted to Building Control.
Key feature U values to be scrutinised if below given values
Fabric Energy Efficiency Standards
NB Note general improvements
NB Effect of thermal bridging and triple glazing
Proposed limiting fabric parameters
Carbon Compliance
Comparison of CO2 targets (gas)
Non Domestic
Consequential Improvements
October 2012 Consequential improvements for domestic extensions / notifiable works come into force?
Domestic Triggers extensions/increase in habitable space/Boiler replacement/replacement of windows.
Non Domestic Triggers extensions/increase in habitable space/Fixed building services/controlled fittings
a) An assessment provided by an accredited Green Deal Assessor; or
b) A recommendations report associated with a valid Energy
Performance Certificate; or
c) SAP Appendix TFN.
Domestic. Capped at 10% of principal works
To include SAP measures
a. Loft insulation
b. Cavity wall insulation
c. Hot water cylinder insulation
d. Draughtproofing.Non DomesticSBEM Measures eligible for Green DealApproved Document List ADL2BControlled Services and FittingsWide variation so challenging… case studies focussed on services
New Thermal elements in existing buildings
Owner operation manual
Issues
Achieving Cost effective energy efficiency measures
Gap between design standards and built performanceLack of sufficient performance dataExisting stockFuel Factor ideally removed for Zero Carbon standard
Robust Calculation methodology
Performance gap
• Energy use/emissions 60-120% worse than predictions
• Why?• Lack of Knowledge
• • Willful or inadvertent deviation • Build quality• SAP shortcomings• Occupancy behaviour
Future Proposals
HMG intend to provide
• Regulation specific training programmes:Testing and evaluation skills development programmes
• Wider education and training programmes
• R+D how buildings actually perform• PAS Publicly Available Specification• Robust National Calculation Methodology• Quality Assurance process
Implications for Construction industry
Improved detailingImproved performance modellingHigher standards of constructionQuality assurance schemes
Passivhaus
Robust Methodology
Attention to detailQuality assurance
NoteThermal BridgesWindow U valueAirtightness
Passivhaus
Heat Loss Form Factor
Accredited detail
Enhanced construction detail
Passivhaus Detail
Things to do
• Analyse thermal performance very early in design process
• Design buildings as integrated low energy systems
• Learn from Passivhaus for fabric design and construction
• Improve infiltration rates• Upgrade existing buildings carefully
The future……is now