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.
A floor plenum is a void between a building’s floor structure and a raised access floor, used for distributing conditioned air to the spaces above.
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.
N.B. This guide replaces BG 12/2010 Floor Void Airtightness – Air Leakage Specification, which was withdrawn.
--BSRIA
[edit] 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.
- Draughts in buildings.
- 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
Grenfell Tower Principal Contractor Award notice
Tower repair and maintenance contractor announced as demolition contractor.
Passivhaus social homes benefit from heat pump service
Sixteen new homes designed and built to achieve Passivhaus constructed in Dumfries & Galloway.
CABE Publishes Results of 2025 Building Control Survey
Concern over lack of understanding of how roles have changed since the introduction of the BSA 2022.
British Architectural Sculpture 1851-1951
A rich heritage of decorative and figurative sculpture. Book review.
A programme to tackle the lack of diversity.
Independent Building Control review panel
Five members of the newly established, Grenfell Tower Inquiry recommended, panel appointed.
Welsh Recharging Electrical Skills Charter progresses
ECA progressing on the ‘asks’ of the Recharging Electrical Skills Charter at the Senedd in Wales.
A brief history from 1890s to 2020s.
CIOB and CORBON combine forces
To elevate professional standards in Nigeria’s construction industry.
Amendment to the GB Energy Bill welcomed by ECA
Move prevents nationally-owned energy company from investing in solar panels produced by modern slavery.
Gregor Harvie argues that AI is state-sanctioned theft of IP.
Heat pumps, vehicle chargers and heating appliances must be sold with smart functionality.
Experimental AI housing target help for councils
Experimental AI could help councils meet housing targets by digitising records.
New-style degrees set for reformed ARB accreditation
Following the ARB Tomorrow's Architects competency outcomes for Architects.
BSRIA Occupant Wellbeing survey BOW
Occupant satisfaction and wellbeing tool inc. physical environment, indoor facilities, functionality and accessibility.
Preserving, waterproofing and decorating buildings.