RSK Building envelope performance – Invitation to RSK’s breakfast briefing


Over the past 20 years, there has been much focus on developing nondestructive methods for assessing the performance of building fabric, including air permeability, infrared thermography and acoustic sound insulation testing. RSK has been at the forefront of this movement and, while undertaking testing work, has developed a range of design consultancy services to help its clients to achieve the required performance standards.

RSK’s breakfast briefing will provide an overview of the building fabric issues to consider; the implications of not getting things right (failure and litigation); when and how they should be considered for maximum effect; and the integrated service RSK can provide to help inform the process. The means of achieving the performance requirements of the future have moved from being reactionary construction-based retrofits or more recently on-site post design conundrums to being upfront engineering- and design-led solutions.

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Why you should attend

The upper limiting values for many of the parameters for building fabric performance, as determined using SAP or SBEM calculations, have remained fairly static. However, the overall target for carbon dioxide production from buildings has fallen and this consequently reduces the allowable targets.

Until now, the three fundamental fabric considerations, airtightness, insulation continuity and vapour control, have tended to be considered in isolation. However, improvements in one without considering the consequences for the others can cause further complications, including poor ventilation, the risk of condensation and lower occupant comfort levels. The noticeable effects of these failures are exacerbated as the overall building performance improves.

RSK is seeing an increase in the number of complaints from building owners and tenants regarding building fabric performance and comfort. Typical complaints are surface condensation and mould growth, draughts, overheating, excessive heating bills, water ingress (possible evidence of interstitial condensation) and structural failure or early degradation of the fabric thermal elements.

Knowledge among stakeholders in construction projects about fabric performance is growing. Unless these issues are considered holistically, the difference between the desired performance and that which is achieved will widen and post-completion claims will increase.

The next challenge in building fabric performance will be delivering buildings with consistently low air permeability (<3), while providing adequate insulation continuity, vapour control, weather tightness, acoustics and longevity for the proposed design.

Who should attend

Our seminar is aimed at architects, engineering designers, design managers, construction managers, estimators and cost managers, together with property developers and owners.


This seminar counts for one and a half hours of continuing professional development time, so delegates will receive personalised certificates after the seminar. For more information, please contact Natasha Layal.

Date and venue

Thursday, 8 October

The Building Centre, 25 Store Street, London WC1E 7BT

RSK Building envelope performance – Invitation to RSK’s breakfast briefing

Date: Thursday, 8 October

Venue: The Building Centre, 25 Store Street, London WC1E 7BT Book here




Registration and coffee



Chair’s introduction, Nigel Board, chief operating officer, RSK



Building envelope performance in Passivhaus projects, Aleksandra (Sasha) Njagulj, head of sustainability and innovation at Bouygues UK



Designing out building envelope performance failure, Simon Lloyd, associate director and Stuart Borland, director, building sciences, RSK



Q&A session and closing remarks



Networking and coffee, plus the opportunity to visit the exhibitions currently on show at The Building Centre


Guest speaker:   Aleksandra (Sasha) Njagulj, head of sustainability and innovation at Bouygues UK
RSK speakers:   Stuart Borland, director, building sciences, RSK
    Simon Lloyd, associate director, building sciences, RSK



More information on guest speaker

More information on RSK speakers

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Guest speaker

Aleksandra (Sasha) Njagulj, head of sustainability and innovation at Bouygues UK

Aleksandra is a qualified architect with over 15 years’ practical experience in architectural design, design management and the sustainable built environment. In 2009, she joined the UK subsidiary of Bouygues Construction, a large international construction company, initially as a design coordinator working on various school projects before moving within the organisation to pursue her passion for sustainability. She currently leads the Sustainability Hub, an enthusiastic team of in-house experts within the technical department and at the forefront of the company’s commitment to deliver true sustainability for its clients. Aleksandra is also in charge of research and development and innovation projects, and always on the lookout for new build environment techniques, products and tools, and joins the academic and industrial partners in their development.

Aleksandra has an MSc in architectural design from the University of Belgrade, Serbia, and an MA in interior design from the University of Westminster, London, UK. She is currently studying for an MSt in sustainability leadership at University of Cambridge, UK. During her time with Bouygues, she has supplemented her architectural qualifications by becoming a licensed BREEAM and Code for Sustainable Homes Assessor and a BREEAM Accredited Professional.

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RSK speakers

Stuart Borland, director, building sciences, RSK

Stuart is a Chartered Architect with over 25 years’ experience in building envelope performance issues. He has specific expertise in the thermal performance of building fabric.
His work areas include providing envelope design advice for new projects, undertaking site audits on new and existing projects, and final performance testing of building enclosures to ensure compliance with specification requirements. Stuart also investigates building performance defects and can provide expert witness services on fabric performance issues. He has extensive experience of infrared thermal imaging, air pressurisation testing and envelope performance monitoring.

Stuart has previously provided technical support for Part L of the Building Regulations (England and Wales) to the Department of Communities and Local Government (CLG).

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Simon Lloyd, associate director, building sciences, RSK

Simon is a specialist in building envelope performance with 18 years’ experience in the UK construction industry, including 4 years as a site-based construction project manager and 14 years providing specialist building fabric consultancy and testing services.
Simon manages the airtightness and thermal insulation continuity design, inspection and test regimes for a wide range of commercial, industrial, retail and residential property developments. He also provides airtightness design insights and advice that have proven successful and achieved right-first-time status. Simon is highly experienced in compiling finite element analysis models for the thermal analysis of construction assemblies.

Simon is a member of the team responsible for reviewing and validating technical guidance literature relevant to finite element analysis modelling of building components and assemblies. He has also developed and managed the in-house calibration of airtightness testing equipment.

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