Floor plenum airtightness
In July 2016, BSRIA published BG65/2016 Floor Plenum Airtightness – Guidance and Testing Methodology. This replaced BG 12/2010 Floor Void Airtightness – Air Leakage Specification,
Since the introduction of airtightness testing as part of the Building Regulations, the air leakage of buildings has steadily reduced as construction teams have become more familiar with the requirements. By introducing lower specifications for floor plenums, it is hoped that the effect will be similar.
It is important that conditioned air in a floor plenum flows into the occupied zone and does not leak into cavities, risers, stairwells, heating trenches or other adjacent zones. A properly sealed floor plenum will allow the diffusers and grilles to fulfill their primary role of delivering air at the correct flow rate. As a result, the airtightness of floor plenums can be a serious energy efficiency issue.
BSRIA’s new guide addresses these issues and places upper limits on the air leakage of floor plenums. Distinctions are made between air leakage to adjacent spaces (normally referred to as plenum leakage), and uncontrolled air leakage into conditioned zones (normally referred to as raised access floor leakage). A testing methodology for both plenum leakage and raised access floor leakage is given, and guidance on achieving both is provided.
To download or purchase the guide, go to the BSRIA Bookshop.
 Related articles on Designing Buildings Wiki
- Air tightness in buildings.
- Airtightness of energy efficient buildings.
- BSRIA articles on Designing Buildings Wiki.
- Building performance evaluation.
- Closing the gap between design and as-built performance.
- Energy Performance Certificates.
- Indoor air quality.
- Performance gap.
- Plenum ventilation in buildings.
- Thermographic survey.
- The history of non-domestic air tightness testing.
Featured articles and news
A new concept unveiled to tackle the lack of sports facilities in inner cities.
'Open hand' designs revealed for a new entertainment complex in China.
Modernist architecture and its many international variations explained.
BRE support Europe-wide strategic heating plans for local and national authorities.
Work set to begin on 'one of America's greatest parks', which will be 10 times bigger than Central Park.
One of our most popular articles - RSHP's Mike Davies writes about the concept design process.
As Cuba mourn the death of Castro, major renovation of this symbolic landmark may be a reflection of the country's fresh start.
How cannabis plants are used to create an alternative building material with plenty of advantages.
What does Mayor Sadiq Khan's first policy statement mean for London's infrastructure?
Bjarke Ingels Group announced as winners of design competition for new residential landmark in Amsterdam.