Andy Simmonds and Bill Butcher

Monitoring CLR Results

Tim Martel, MCIAT CEPH

The AECB monitors 10 sites for the CarbonLite Retrofit programme and Simmonds.Mills monitors 2 for commercial clients. This presentation will look at a project near Huddersfield. Mineral wool internal insulation was applied as IWI to a cavity wall assembly and we look at how it has performed. Essentially there are 2 main questions: (1) is the insulation working safely? And (2) if not, where is the moisture coming from and how? These two questions are answered through estimates of mould risk, vapour gradients, capillary gradients, moisture is taken up by materials from the air and diffusion.

Speaker biographies

Andy Simmonds AECB Chief Executive Officer

andyAndy is an architectural designer and sustainable building consultant, having extensive experience with historic buildings and materials, refurbishment and new build. His practice Simmonds.Mills Architects has specialised in rammed earth, innovative timber construction, green materials and delivers projects to AECB Silver, EnerPHit and Passivhaus Standards

As part time CEO of the AECB - the sustainable building association, he initiated and developed the AECB CarbonLite project including the AECB/TSB low energy buildings database and the CarbonLite Silver/Passivhaus/Gold detail design guidance.

He was part of the team that set up the AECB's Passivhaus Trust. Simmonds.Mills' non domestic 'BREEAM Excellent' building in Essex is a certified Passivhaus and his family home in Hereford is a successful low energy refurbishment - and the first Passivhaus 'EnerPHit' building certified in the UK.

Bill Butcher

Bill ButcherBill Butcher, Director of Green Building Store, has been the project leader of the Denby Dale Passivhaus, Stirley Farm EnerPHit and Golcar Passivhaus projects and has just completed the Cumberworth radical retrofit project. Originally trained as a quantity surveyor, he has over 40 years’ building experience, including construction of the Longwood low-energy house in the early 1990s.

Bill is a Certified Passive House Consultant and a Certified Passive House Tradesperson. He also serves on the Technical Panel of the Passivhaus Trust and teaches on the Construction module of the CarbonLite CEPH Designer course.

Tim Martel, MCIAT CEPH

TimTim is a freelance Chartered Technologist and Passivhaus Designer with a background in calculations through commercial R&D. He works with Simmonds.Mills Architects and others with newbuild and retrofit, mostly for domestic projects. He is an expert in the Omnisense monitoring system and developed the calculations and case study reports used in the CarbonLite Retrofit course.

He also developed the AECB’s economics calculations; reports compare the economics of 10 approaches per house for the CarbonLite Retrofit course.




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  • 21 July 2016 Creation Date
  • 25 September 2019 Last Updated