Ensuring good operation of MVHR systems

Graph from Characteristics and performance of MVHR systems. A meta study of MVHR systems used in the Innovate UK Building Performance Evaluation Programme

Blog looking at improving MVHR heat recovery ventilation systems in operation and how poor maintenance programmes can impact on the performance.

16th May 2016

Forwards not backwards on climate

Forwards not backwards march Leeds May 7 2016

Green Building Store Director Chris Herring calls for strong Government support for energy efficiency, including Passivhaus and deep retrofit.

11th May 2016

20th International Passivhaus Conference 2016

Passivhaus Darmstadt

Chris Herring shares his reflections on the 20th International Passive House Conference, Darmstadt, April 2016.

25th April 2016

Cumberworth radical retrofit: It’s a wrap!

Conservatory outside thermal envelope at Cumberworth radical retrofit

Blog on completion of our radical ‘whole house’ retrofit project. The final airtightness test prompts changes to our wood burning stove specification.

9th March 2016

Cumberworth radical retrofit: Roof, heating & MVHR strategies

Cumberworth retrofit Pro Clima Solitex windtightness barrier plus rooflights

Bill’s latest blog on the Cumberworth radical retrofit covering the insulation and airtightness strategy for the roof and also heating and ventilation strategies.

22nd January 2016

Denby Dale Passivhaus: 5 years on

Denby Dale Passivhaus at dusk

“It’s been and continues to be a fascinating and rewarding learning experience over the last five years. We are convinced that Passivhaus will continue to grow because it is a WIN WIN WIN situation.” Geoff and Kate Tunstall report on life in the Denby Dale Passivhaus five years on.

21st September 2015

Cumberworth radical retrofit: Ground floor and intermediate floors

Parging between intermediate floors at Cumberworth radical retrofit

Bill Butcher explains detailing for ground and intermediate floors at the retrofit project., including airtightness and thermal bridging strategies.

24th June 2015

Cumberworth radical retrofit: Window reveals

Window reveal Kevothermal VIPs insulation at Cumberworth radical retrofit

Bill Butcher looks at space-saving solutions to reducing thermal bridging around window reveals at the retrofit project.

18th May 2015

International Passivhaus Conference 2015

Pablo Neruda Passivhaus Primary school, Leipzig

This year the International Passivhaus Conference was held in the city of Leipzig. It is one of the German municipal authorities committed to Passivhaus.

21st April 2015

Cumberworth retrofit: Internal wall insulation (IWI)

Internal Wall Insulation at Cumberworth radical retrofit

Bill Butcher looks at innovative approaches to Internal Wall Insulation (IWI) used at the retrofit project to minimise the dangers of interstitial condensation, including use of a new vapour open IWI material.

26th February 2015

Affiliations & Accreditations