Diaphragm
In its broadest sense, the word ‘diaphragm’ refers to a thin material that forms a partition.
The 2018 International Residential Code (IRC), published by the International Code Council (ICC) defines a diaphragm as: ‘A horizontal or nearly horizontal system acting to transmit lateral forces to the vertical resisting elements. Where the term “diaphragm” is used, it includes horizontal bracing systems.’
Pressurisation of Closed Heating and Cooling Systems (BG82 2022), by Rob Clemson, published by BSRIA in October 2022, defines a diaphragm as: ‘Typically, a bucket-style membrane, retained at a vessel mid-point, separating the expanded water from the gas cushion.’
See also: Diaphragm wall.
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