Last edited 25 Feb 2021

Pre-manufacturing (2D primary structural systems)

Modern Methods of Construction, Introducing the MMC definition framework, published by Ministry of Housing, Communities & Local Government (MHCLG) in 2019 defines 7 categories for MMC:

Category 2 – Pre-Manufacturing (2D primary structural systems) is defined as:

‘A systematised approach using flat panel units for basic floor, wall and roof structures of varying materials which are produced in a factory environment and assembled at the final workface to produce a final three-dimensional structure. The most common approach is to use open panels or frames, which consist of a skeletal structure only, with services, insulation, external cladding and internal finishing being installed on site.

‘More complex panels – typically referred to as closed panels – involve more factory-based fabrication and include lining materials and insulation. These may also include services, windows, doors, internal wall finishes and external claddings. The system includes structural performance for primary walls and all floors (note – this excludes unitised or composite external walling systems that are not load bearing included in Category 5).’


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