The September 2011 edition of Delta t looks at the following:

Industry News - School rebuilding rebooted, CIBSE backs DECs, news in-brief.
Building Performance Evaluation - Roderic Bunn reports on the design and construction of Mayville Community Centre, a Passivhaus refurbishment project in London, and the subject of long-term performance monitoring.
Environmental Network - James Parker and Tracey Tilbry explain the objectives of BSRIA's Building Environmental Assessment Network and its role in the future development of rating schemes.
Global Rating Systems - Irena Saniuk draws a map of the main environmental assessment methods in use around the world.
Rating Refurbishments - Sarah Birchall explains the methodology behind Ska, a new benchmarking and environmental assessment tool for refurbishments.
Market Update - Jeremy Towler and Lone Hansen detail the convergence between communications and security technologies in the UK market.
Information Update - Clare Sinclair shows us the change in the way we access the building services legislation.
Publications News - Alex Goddard reports on an update of one of BSRIA's most important publications, Pre-commission Cleaning of Pipework Systems.

Also, the latest news on BSRIA training courses, networks, and events.