Design of ground gas protection in new buildings


This one day course (delivered via 2 x 3hr Zoom) would be based around the requirements of BS8485 for new buildings.  It would aim to dispel the myth that gas protection design is just adding up numbers of points and obtaining warranties from suppliers.  This is a major cause of problems in the industry.  

Introduction 
Designing ground gas protection systems following the guidance in BS8485 is more than just adopting a Characteristic Situation and adding up points.  It requires a detailed justification for any gas membrane and calculations for any underfloor ventilation system that is specified.  The points assigned to the floor construction should also be justified. The design should be summarised and explained in design report and shown on detailed site specific drawings for construction.  

This training will explain in detail the factors to be considered and how to complete the appropriate venting calculations.   It will explain the details to be included in a design report with reference to relevant clauses in BS8485. The standard also recommends that the design report should include the verification plan for the proposed system.  The course will also explain when Detailed Quantitative Risk Assessment (DQRA) might be used in place of the simple empirical points system.

Who should attend

The training will be relevant to anyone who procures, designs or approves gas protection systems.  This would include developers, contractors, consultants, NHBC and local authorities

Why should you attend

- gain an overview of the contract for gas design, roles and responsibilities 
- understand BS8485 points system – where and when it can be used.   
- learn design considerations for concrete floor slabs and basement walls for gas resistance and   BS8485 points
- explore design, detailing and specification of gas or VOC membranes – how to assess durability, permeation of gases other than CH4 and CO2, VOCs 
- review gas detection systems – what are they for and critical factors eg detector head locations
- explore design for future changes in gas regime
- undertake Ventilation design calculations 
- understand the design report and verification plan
- share experiences and knowledge with our expert trainers and other delegates
- obtain CPD accreditation.

Course content 


- Contract for gas design, roles and responsibilities
- BS8485 points system – where and when it can be used.  
- Design considerations for concrete floor slabs and basement walls for gas resistance and BS8485 points
- Design, detailing and specification of gas membranes – how to assess durability, permeation of gases other than CH4 and CO2, VOCs
- Ventilation design calculations 
- Gas detection systems (time permitting)
- Design for future changes in gas regime
- Design report and verification plan




Open course dates available to book now.

In house options
To discuss in-house training requirements, contact Nipa Patel on 020 7549 3300

 
Steve Wilson, Technical Director, The Environment Protection Group Ltd

Steve is highly experienced in gas protection risk assessment and design and has contributed to much of the guidance and technical documents 
that have been published in relation to ground gas risk assessment and mitigation design. He was one of the authors of the Wilson and Card paper 
published in 1999 that is the basis of the Gas Screening Value and points system that is used as one simplified approach to design in BS8485. 
Steve is a Society of Brownfield Risk Assessment (SoBRA) accredited risk assessor for ground gas and vapour intrusion. 

 
Sarah Mortimer, The Environment Protection Group Lt
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Sarah has experience in gas protection risk assessment and design and alongside Steve has also contributed to much of the guidance and technical documents that have been published
in relation to ground gas risk assessment and mitigation design. Sarah is also Society of Brownfield Risk Assessment (SoBRA) accredited risk assessor for ground gas and vapour intrusion.