Clearer guidance on interpretation and protection measures are two of the improvements that have been made to the revised ground gas standard published by BSI today.
According to BSI the updated BS 8485 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings reflects changes in the sector since the standard was first published in 2007.
“This substantially expanded - and re-named - second edition of BS 8485 reflects the considerable advances in industry guidance, practice and experience for protection of new buildings against methane and carbon dioxide ground gases since the standard’s first publication in 2007,” said BS 8485 committee chair Richard Owen.
“It cross references BS 8576:2013 for guidance on ground gas investigation and includes much more detailed guidance on the interpretation of gas monitoring data, including worked examples. Four building ‘types’ and definitive requirements for membranes to be assigned gas protection points are described for the empirical method presented in the standard.
“I am sure that designers of gas protection measures and regulators involved in the assessment of design solutions will find this updated and expanded second edition a key reference.”
In a statement, BSI said that the standard was revised through industry collaboration and is a key piece of guidance for consultants for the design of investigations and gas protection measures for new developments, and regulators (environmental health officers and building control) who need to assess/approve foundation designs.
“BS 8485 goes a long way towards clarifying what land developers, designers and regulators need to know when considering the status of the ground,” said BSI head of market development for sustainability David Fatscher. “This guidance is not prescriptive and professional judgement should be made as to the acceptability of risk, as to whether a more rigorous site assessment or conservative measures in design are needed.”
Key changes to BS 8485:
- Clearer guidance on the interpretation of gas monitoring data and assignment of characteristic situations (CS)
- Reference Technical Note RB17 CS classification using toxic organic compounds
- Review and expanded guidance on protection measures scoring
- Include reporting requirements
- Added annexes on radon and volatile organic compounds
- More detailed guidance on interpretation of gas monitoring data