Ground gas protection measures in construction: installation and verification

Standard details
This training standard is in development and will be published shortly.

CITB has developed this standard in discussion with industry


Minimum 1 day of 6 learning hours


The purpose of training delivered against this standard is to provide candidates with the knowledge and skills to install a membrane and verify it correct installation.

The scope of this standard covers:

  • hazardous gases and membranes
  • installation and best practice
  • practical workshop session, detailing and fusing of membranes
  • CIRIA C735 guidance
  • the verification process
  • verification in practice.

Occupational relevance

Training delivered against this standard would be relevant to the following occupational groups:

  • operative and craft
  • supervision.

Candidate pre-requisites

There are no candidate pre-requisites as part of this standard. However, candidates should have some technical or practical experience of working in a related environment.


As a minimum, course instructors must be able to demonstrate that, in relation to this standard, they have:

  • A train the trainer or instructional techniques course certificate
  • Successfully completed training to this standard 
  • At least 2 years relevant industrial experience
  • A verifiable CV.


The following method may be used in the delivery of this standard:

  • classroom
  • e-learning
  • blend of classroom and e-learning

All materials and equipment must be of a suitable quality and quantity for candidates to achieve learning outcomes, and must comply with relevant legislation.

The class size and candidate/instructor ratio must allow training to be delivered in a safe manner and enable candidates to achieve the learning outcomes.

This standard is considered to contain 51 per cent or more practical learning.


For the successful completion of training, the trainer will be required to make a declaration of the learner’s contribution during the course and that they are confident the learner has understood the content of the course.

Quality assurance

Quality assurance against this standard will require initial approval of the training organisation and their content mapped to the standard. 

CITB will also conduct an approval intervention, either desk-based or centre visit, to ensure the training organisation can meet the requirements of the Training Standard. 

Approved training organisations (ATOs) will be required to present information on records of training and assessment upon request to CITB for desk-based analysis. They will also be visited annually by the CITB quality assurance team.


There are no mandatory renewal or recommended refreshment requirements for this standard.

Approval date

November 2018

Review cycle

Either on request or in 3 years from approval date.

Learning outcomes


The candidate will be able to
Additional guidance to support learning outcome

Describe hazardous gases and membranes


Install a gas membrane using best practice

Practical workshop session

Detail and fuse membranes using best practice

Practical workshop session

Read and follow CIRIA C735 good practices


Describe how to verify an installation


Verify an installation

Practical workshop session


Additional information about this standard

Health & Safety Executive (HSE) confined spaces

British standards

Find out more about British Standards

  • BS 8485:2015 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.
  • BS 8576:2013 Guidance on investigations for ground gas. Permanent gases and volatile organic Compounds (VOCs).
  • BS 8102:2009 Code of practice for protection of below ground structures against water from the ground
  • BS 5930:2015 Code of practice for ground investigations
  • BS 5250:2011 Code of practice for control of condensation in buildings
  • BS EN 1997-1:2004+A1:2013 Eurocode 7. Geotechnical design. General rules
  • BS 8485:2015 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new building.


  • CIRIA C735 – Good practice on the testing and verification of protection systems for buildings against hazardous ground gases
  • CIRIA C748 – Guidance on the use of plastic membranes as VOC vapour barriers
  • CIRIA C665 – Assessing risks posed by hazardous gas ground gases to building.


See government legislation in detail

  • Building and Buildings, England and Wales: The Building Regulations 2010.
  • The Building (Scotland) Regulations 2004
  • Statutory Rules of Northern Ireland
  • Conservation (Natural Habits etc) Regulations 1994
  • Construction (Design and Management) Regulations (CDM) 2007
  • Management of Health and Safety at Work Regulations 1999
  • Wildlife and Countryside Act 1981
  • Health and Safety at Work etc Act 1974