Published on March 6, 2014
Design vs As-built Evidence Review Ian Orme Sustainable Construction Group BSRIA
Making buildings better 2
Evidence Gathering Aims • Understand where the gaps in the development process occur, • Reflect performance issue for dwellings constructed to meet current Regulation requirements, • Review different scale developments and developers, • Develop a prioritisation matrix to help focus and prioritise possible solutions Making buildings better 3
Evidence Gathering • Literature review – 100+ reports and documents reviewed to date • Housebuilding process review – Nine developments covering 1,000 plots – On-going work • SAP audits and questionnaires – Review of as-designed and as-built SAP Making buildings better 4
Literature Review • State of the Industry – Aggregated data from NHBC, LABC, professional institutions, house builders, manufacturers • Compliance Processes – As-built SAP ratings, Air Permeability tests results, use of ACD/ECD, Commissioning Test Results • Field Trials – EST Heat Pump report, TSB BPE programme Making buildings better 5
Literature Review • Academic Studies – Stamford Brook, Elmtree Mews, Temple Avenue • “Secret” knowledge – Manufacturer’s field trial data, unpublished academic work • Anecdotal Making buildings better 6
Literature Review 5% Evidence type 5% 10% 35% 45% Making buildings better Guidance Manufacturers Field Trials Academic Studies Site visits (inc TSB) 7
Housebuilding Process Review • Approach – Information gathering followed by semi-structured interviews – Design review – Construction site walkthroughs • Developments volunteered by housebuilders – Nine completed to date – Have tended to be volume builders, but ‘pot’ is increasing Making buildings better 8
SAP Review • Three stage approach: – Review of original design stage assessment as provided by the developer, – Recalculation of the design stage based on the design information provided for the process review, – Calculation of as-built SAP based on site inspection and interview findings. Comparison with developer provided as-built SAP, if available. Making buildings better 9
Synthesizing the Findings • Approx. 50 issues identified across the Working Groups • Frequency with which each issue occurs in the dataset • Nature of the source data: peer reviewed academic paper; journalistic article, ‘hear say’ • Evaluation by review group of impact across a range of deliver models (volume, small scale and traditional contracting) Making buildings better 10
Literature Review Number of Sources Referenced by Issue Area 100 90 80 70 60 50 40 30 20 10 0 Concept & Planning Detailed Procurement Construction Verification design Making buildings better Testing Energy Overarching Modelling Tools Good Practice! 11
Literature Review Number of References by Issue Area 1200 1000 800 600 400 200 0 Concept & Planning Detailed Procurement Construction Verification design Making buildings better Testing Energy Overarching Modelling Tools Good Practice! 12
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The Matrix Making buildings better 15
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Illustration of Findings • Integration of design – Focused on architectural layout and optimisation of space – Increases complexity of geometry with ‘knock-on’ impact to structural requirements, increasing thermal bridging – A near complete absence of an engineering approach to services design with resulting problems in installation and commissioning Making buildings better 23
Illustration of Findings Making buildings better 24
Summary • Evidence review has established 15 clear issues that are demonstrated to impact the performance gap • These encompass, knowledge and skills, communication and responsibility for the energy performance • Broad themes and findings similar to wider TSB BPE work • Developing strategy for Priority for Research in next phase of project Making buildings better 25
Design vs As-built Evidence Review firstname.lastname@example.org. uk
The Zero Carbon Hub is running a collaborative industry led programme examining the discrepancy between design and as built energy performance for new homes.
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