Passivhaus Affiliate

MASTERCLASS: Passivhaus Retrofit

Date: 1 May 2014 Time: 09.30 - 17.30
Location: Royal College Room 215, University of Strathclyde, Glasgow Cost: £150 + VAT for PHT members, £200 + VAT for non-members

Passivhaus Trust Masterclass logo

Passivhaus has a specific standard for retrofit projects – EnerPHit – which supports the achievement of Passivhaus within the restrictions of an existing building form. However, this is still a difficult standard to achieve and doing so requires a detailed understanding of a building physics, particularly in terms of moisture and thermal bridging, as well needing specific solutions for difficult areas such as window reveals and floor/ wall junctions.

This workshop, limited to around 30 participants and led by Bob Prewett of Prewett Bizley Architects and Mark Elton of Sustainable by Design, two of the UK’s foremost experts on Passivhaus retrofit projects, focuses on what to look out for when designing, specifying, building and commissioning EnerPHit projects. The session will include examination of several practical projects and discussion of practical design applications and will primarily focus on residential projects, although many of the lessons are transferable to a non-domestic building.



The workshop aims to address the following FAQ’s:

  1. When EnerPHit is appropriate and when it is not?
  2. Is it cost effective and can you just go part of the way?
  3. Are there common design problems/challenges to watch out for?
  4. How to achieve air tightness?
  5. How does one ensure the ventilation system will fit?
  6. Are there any rules of thumb for useful user operation?


Who should attend?

Architects, engineers, planners, building control officers, energy managers, builders, housing associations, researchers and others who want to learn more about how to deliver successful, healthy low energy retrofit projects.

This Masterclass is aimed at practitioners who already have some knowledge of Passivhaus, either by undertaking a Passivhaus project or by completing the Passivhaus designer (CEPH) course or both, or have knowledge of low-energy retrofit projects and are thinking of moving to the EnerPHit/ Passivhaus standard for future schemes.



09:30 – 09.35 Welcome + introductions for speakers + delegates

09.35 - 11.00  Part 1: Strategies for refurbishment

Building physics for refurbishment projects (+WUFI calcs)

What we know and what we don’t know - how far to push?

How EnerPHit relates to Passivhaus and other retrofit standards

Choosing your approach for different building types

Questions and discussions

11:00 - 11:30: tea & coffee break

11:30 – 13:00 Part 2: Design choices, material specification and fine grain design.




Ventilation systems & other services

Design exercise (more stretching – different construction types) Q&A

13:00 - 14:00: lunch

14.00 -15.30: Part 3: Ensuring quality on site.

Choosing your approach for different building types

Scheduling and sequencing of works

Examples of common problems and how to avoid them

When and where to inspect

Exercise (e.g. MVHR problems slide but for other aspects too)

Questions and discussion

15:30- 16:00: tea & coffee break

16.00-16.45: Part 4: Some thoughts on costs, value and performance.

Examples of costs for different build types

Examples of costs for different approaches

Feedback on performance, including heating bills

Examination of life cycle costs, including savings

Questions and discussion

16.45 - 17:00: Close and final survey.


How to book: 

Please contact Roger Southcott

Please also answer two questions when you book:

1. Current knowledge level/background of the workshop topic?

2. Any specific issues/knowledge/questions you would like us to cover in the workshop?

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