creaconstructionevent: partl changes

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