Retrofitting ground gas protection measures to existing & refurbished buildings

This one day course (delivered via 2 x 3hr Zoom sessions) has been developed to complement CIRIA guidance Retrofitting hazardous ground gas protection measures in existing or refurbished buildings (C795).

The training programme will help consultants, contractors, regulators understand the process of retrofitting gas protection measures for permanent gases (i.e. methane and carbon dioxide,) VOCs and radon to existing buildings where protection measures were absent, inadequate or faulty. It  will cover buildings subject to extension (lateral or basement) or to refurbishment. It will also explore the advantage and disadvantages, design and installation of the various options including ventilation, sealing of preferential migration pathways, membranes, sub slab works, in ground works. Finally verification process will be explained.
The presence of ground gases sometimes requires that gas protection measures are required to be installed in existing buildings.  BS8485 does not cover gas protection to existing buildings and, apart from radon, there is limited guidance available on retrofitting gas protection in the UK.  

CIRIA's new guidance Retrofitting hazardous ground gas protection measures in existing or refurbished buildings (C795), provides guidance to risk assessors and designers involved in this field.  The course is based on C795 and other relevant guidance on retrofitting gas protection.

Who should attend
The training will be relevant to consultants , contractors , clients,, local authorities  and regulatory bodies such as the EA/SEPA/NRW/NIEA.

Why should you attend

- understand the risk assessment process for retrofitting
- understand options appraisal to allow the most appropriate option to be chosen Understand the full range of options available and the advantages and disadvantages of each.
- understand how other building performance requirements such as water and damp penetration, condensation, fire resistance, structural performance and disabled access should be considered as part of the retrofit design 
- understand the differences required in how verification is carried out for retrofit projects
- share experiences and knowledge with our expert trainers and other delegates
- obtain CPD accreditation.

Course content 

Risk assessment and retrofitting remediation
Options appraisal
Sealing floors and improving existing ventilation 
Providing new subfloor depressurisation, pressurisation and ventilation
General consideration and specification of membranes
Detailing membranes
Basements and extensions
Other methods 

Find out more
Contact Joanne Kwan, Project Manager for technical queries. 

Open course dates available to book now.

In house options
To discuss in-house training requirements, contact Nipa Patel.

  Steve Wilson, Technical Director, The Environment Protection Group Ltd
Steve has over 20 years practical experience of geotechnical and environmental design for civil engineering and building structures including drainage design and redevelopment of contaminated land.
Hugh Mallett, Technical Director, Buro Happold

Hugh is a chartered engineering geologist with over 20 years’ experience in land projects on sites affected by toxic, chemical and landfill gas contamination.  Hugh has prepared expert witness evidence and best practice guidance.


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