Whole House Deep Retrofit - AECB Expert Advisor Robert Prewett

In 2008 I was invited to carry out an extreme low energy retrofit on a house in a conservation area in central London. That project radically changed that house and me – both for the better, I hope. Since then I has been immersed in the world of retrofit and I am about to complete my own project literally as this webinar is broadcast. I will reflect on the conclusions I have come to and the questions I still have. I look forward to a lively discussion from you too.

Robert Prewett – Architect specialising in low energy fabric first design for new build and retrofit. Passivhaus certified designer.

Robert is an architect who has expertise in low energy design. Prewett Bizley has delivered new build passivhaus homes and have pioneered deep low energy retrofit projects across a range of house types. We were one of the first to talk about whole house design and continue to teach on the subject of retrofit.

The AECB Stock Modelling Tool - AECB Expert Advisor - Tim Martel

The AECB has modelled the CO2 produced by the housing stock in a new stock modelling tool. This combines the operational CO2 with the embodied CO2 of construction.
It includes new build, and all the existing properties by dividing them into a number of standard house types and modelling them in PHPP.
It combines a lot of the work that the AECB has been doing. We will be looking at models for England and for smaller regions.


PHribbon – real life examples with AECB Expert Advisor - Tim Martel

AECB PHribbon makes using PHPP quicker, easier and it uses the existing information beyond just energy. It’s written by Tim Martel, an AECB expert who is also a course tutor for the Carbonlite Retrofit course.
AECB PHribbon makes the same changes to your PHPP that you could have made by hand. It works from an extra ribbon tab in Excel, just like ‘Insert’ or ‘Page Layout’ and uses macros (macros are already part of all PHPP v9 products). It includes a manual, support and training through videos.


The Airtightness Process - AECB Expert Advisor Paul Jennings

AECB Expert advisor Paul Jennings will deliver this webinar.
Good airtightness does not happen by accident. If you are aiming to achieve the low air leakage rates necessary for successful Passivhaus or AECB Building Standard projects, it is essentially to think about airtightness from the earliest stages…having achieved a design that can deliver the specified airtightness, it must then be delivered.


An independent Guide to Positive Input Ventilation (PIV) with Toby Cambray, Greengauge

Positive Input Ventilation (PIV) has become a more popular building ventilation option in recent years. But what is PIV, are the benefits claimed accurate, are there any drawbacks or other things that should be considered before installing it?

What is PIV? How we ventilate Technical Considerations Filtration and air quality Overheating Fabric Risks – where is that moisture going?

These topics and more will be explored in this webinar.


Toby Cambray – founding director and building physics lead at Greengauge

Toby holds a BEng in Acoustical Engineering and an MSc in Theory and Practise of Sustainable Design. He is experienced with a variety of tools for assessing whole-building energy efficiency, component performance and moisture risk assessment. He is a member of Technical Working Group 1 (Modelling and Monitoring) for the Centre for Moisture in Buildings and a regular guest lecturer at UWE.

HEALTHIER HOMES: Insights from prototyping affordable housing in Tanzania with Hannah Wood and Otis Sloan Brittain

How can the global demand for low-cost housing be met whilst reducing environmental impact and improving family health? Join project architects Hannah Wood and Otis Sloan Brittain on the ground in Tanzania for an insight into their work in architecture and health research - applying iterative approaches to climatic design including Computational Fluid Dynamics simulation and 1:1 prototyping.

Sub-Saharan Africa will account for the majority of the world's population growth over the next decades, with the number of people expected to double to 2.5 billion by 2050 (UN, 2019). This will necessitate the construction of over 400 million new homes.


The Star Homes project, developed by an interdisciplinary team of architects, physicians and entomologists, combines robust interventions which we hope will improve family health and well-being. The house design, developed from 10 past prototypes, is adapted for the hot, tropical climate.

Optimising resource use was a key concept guiding the house design. Initial BIM calculations suggest that per m2 the prototype house uses 37% less embodied carbon, 41% less embodied energy and 70% less concrete compared with a typical local concrete block construction. Overall the build cost of house and latrine is between $6000 - $8000 and can be built in under 4 weeks. Passive design strategies ensure there are no operational costs throughout the home’s predicted 30-year lifespan, unlocking time and resources to strengthen rural communities and lift families out of poverty long-term.

The health of families in 110 prototype homes, constructed in 60 villages across the Mtwara region in Tanzania, will be compared with 440 control houses as part of a 3-year randomised control trial, one of the largest ever studies into the effect of housing on family health. The construction of the 110 homes to be used in the trial is currently underway and this phase of the project is predicted to complete later this year

New features in designPH 2.0 with The Passive House Institute

Dragos Arnautu and David Edwards, from PHI will present a webinar on last year's major release of designPH. They will discuss the new features of designPH 2.0 including:

New shading algorithms: Complex shading scenes can now be analysed accurately and both winter and summer shading factors can be exported to PHPP.
Comparison of results: The new "Compare Results" tab allows the key analysis results to be tracked as the model evolves.
Thermal bridges: Assignment of user defined thermal bridge properties.
Ventilation inputs: New inputs for ventilation strategy, MVHR unit selection, airtightness test result and more.
User Interface: An improved user interface and automatic naming and ordering conventions for windows and surfaces.

Don't miss this opportunity to learn about the new features of designPH 2.0 that promise to significantly improve the Passive House design process!

ESCO IN A BOX with AECB Expert Advisor Dr Steven Fawkes

EnergyPro Ltd have been awarded a Government contract to develop 'ESCO-in-a-box' - a new concept for increasing the uptake of energy efficiency projects by small and medium-sized enterprises (SMEs).

The ESCO-in-a-box system will equip organisations such as community energy groups with a standardised toolkit - including project processes and documentation, vetted technology partners and contractors, and sources of finance - to deliver energy efficiency projects for SMEs.

We are working with a consortium of organisations to pilot the concept in Oxfordshire. We will be setting up a new Community Energy Service Company (CESCO) in partnership with Low Carbon Hub, to begin serving local SMEs later this year.

COVID19 - working together to urgently improve infection control in Care Homes with Eric Fewster & Dr David Tomlinson

Based on independently developed advice and guidance published here: https://www.bushproof.com/care-homes-strategy-for-infection-prevention-control-of-covid-19-based-on-clear-delineation-of-risk-zones/ this webinar seeks to share enhanced guidance to better prevent transmission of Covid-19 in care homes. Please join us to discuss the potential for urgent application in UK care homes.



  • Those who have loved ones in care homes and who are able to get in direct contact with care home managers to share this guidance
  • Those who don’t have family members in care homes, but who may be passionate about improving conditions in care homes by sharing the guidance with local MPs & local public health office officials.
  • For anyone working in care homes – to be able to understand the principles so that the strategy document makes sense, in order to adapt to your local context

Eric Fewster, MSc, C.WEM, CEnv, Independent Water & Environmental Manager, Salford, UK (webinar presenter)

With contributions / review from:

Dr David R Tomlinson, BM, BSc, MD, University Hospitals Plymouth NHS Trust, Plymouth, UK (webinar presenter)
Jean-François Fesselet, MSc, WatSan Unit Coordinator, MSF, Amsterdam, The Netherlands
Dr Sarah House, D.Litt, CEng, MICE, C.WEM, FCIWEM, Independent WASH / Public Health Engineer
Michaël R. Laurent, MD, PhD, Geriatrician, Imelda Hospital, Bonheiden, Belgium
Adelina Comas-Herrera, MSc, Assistant Professorial Research Fellow, Care Policy & Evaluation Research Centre (CPEC), London School of Economics & Political Science, UK, Editor of LTCcovid.org

The author and reviewers collectively have a mix of experience from medicine/health, care homes, water/sanitation/hygiene, outbreak infection prevention & control (specifically from Ebola and cholera outbreaks) and emergency response.

MATERIALS: Embodied CO2 with Tim Martel

This webinar, delivered by Tim Martel, shows how you can estimate the embodied carbon dioxide of building materials used in a retrofit or new build. Tim will use the Embodied CO2 module of the AECB’s PHribbon software to calculate embodied carbon for different scenarios within PHPP. This uses data from the ICE database.

FINANCE: Improving Buildings' Performance - How to Scale the Market, with Steven Fawkes

Steven will discuss ways to unlock the potential of better buildings in the UK, focusing on the demand and finance issues. He will look at developments in Europe and the US for inspiration and successful models for improving the performance of new and existing buildings at scale. Q&A after will allow time to explore the nitty gritty of finance mechanisms and risk reduction.

PHribbon with Tim Martel

Tim Martel demonstrates this easy to use software to help with PHPP calculations.

you can find out more by visiting the PHribbon page

BIODIVERSITY: Bats and roofing products with Dr Stacey Waring

Dr Stacey Waring discusses her research with AECB members which shows that non-woven roofing membranes pose a serious threat to bats as a result of entanglement and there are also numerous other concerns regarding these membranes in a bat roosts, including membrane functionality and micro-climatic changes.

CITIES: How do you decarbonise a city - or a county?

The AECB asked global consulting group Anthesis to discuss their city-scale decarbonisation modelling tool (SCATTER) as the AECB was keen to understand the assumptions underlying the model - assumptions have a huge impact on the results, and the advice given.
SCATTER is being used to advise and increasing number of UK cities (such as Greater Manchester) and other Local Authorities. The Tyndall Centre is able to advise LA’s for free on their share of the UK Carbon Budget to help develop specific policy targets.
In this video a presentation by Anthesis' Brad Blundell is followed by a fascinating Q and A.
A must watch.

CLIMATE ACTION: Climate Change Starts at Home with Sarah Price

Every home in the UK produces greenhouse gases, whether it be directly by burning gas, or via our electricity grid, that is still reliant on fossil fuels. In order to halt climate change, we must make changes to the way we live our lives. In this webinar, I will explore how we can reduce energy we use to heat our homes, from simple DIY projects up to whole-house deep retrofits. We will touch on how we can make our homes more climate change resilient, to prevent overheating and water shortages.

Challenges of retrofitting damp masonry walls with Dr Eric Rirsch & Clementine Walker - Safeguard

This webinar is presented by AECB member Safeguard Europe who have been invited to share their understanding and experience of the topic - and as such should not be treated as representing AECB technical advice. Retrofit challenges of retrofitting masonry walls: damp, salt laden masonry. Dr Eric Rirsch and Clementine Walker will be looking at the fundamentals of damp protection – including the visual manifestation of moisture and analysis of the problem.

Zero carbon, resilient retrofitting for low income tenants with Alan Clarke

This web tutorial, led by Alan Clarke, considers Zero carbon, resilient retrofitting for low income tenants.
North Camden Housing Coop has just retrofitted a block of 15 flats to the Passivhaus EnerPHit standard. Previously the flats were cold, damp and draughty, with low income tenants simply unable to afford to keep warm.

DESIGN & CONSTRUCTION: Construction quality lessons from Passivhaus with Will South

Join Will South, AECB expert adviser, as he reflects on the latest lessons from Passivhaus certification assessments and attempts to improve construction quality on projects. We’ll look at successes, failures and photos that are applicable to all low energy projects. The focus is mainly on new buildings but will be relevant to all construction.

Financial Aspects of Retrofit with Tim Martel

This webinar  tutorial, led by Tim Martel In depth discussion of typical housing archetypes selected by Tim Martel, using the “PHribbon” software designed by Tim for CLR (a PHPP add-on) to assess retrofit options from a cost-benefit perspective e.g. financial decision-making, investment appraisal methods, etc.

SAP 10 and the implications of changing emissions factors for grid electricity with Alan Pither

A new version of the Standard Assessment Procedure (SAP), SAP 10, is expected to be introduced sometime in 2020 and this will incorporate a number of technical changes as well as updated emissions factors and average fuel tariffs. Some details are subject to change according to what is finally decided regarding changes to Part L that will be implemented at the same time, but this webinar will explain the expected changes and their implications for Part L1a compliance and standards for the improvement of existing homes.

BUILDING SCIENCE: woodfibre internal wall insulation

AECB Expert Advisor, Architect and retrofit expert Harry Paticas will present a real life wood fibre internal wall insulation case study of a listed solid brick wall townhouse. Certified PH designer and Architectural Technologist Tim Martel will discuss the results of the environmental condition monitoring for the project and finish with an overview of key insights from other AECB CarbonLite retrofit case studies, which look at different insulation and approaches.