In 2019, a MMC definition framework was developed by a government and industry working group on MMC. It covers seven MMC Categories.
The framework was developed to regularise the term ‘MMC’ by defining the broad spectrum of innovative construction techniques being applied in the residential market.
Category 1 volumetric, three dimensional ‘boxes’ are manufactured in factories and delivered to site. Typical systems include timber, steel or cross laminated timber (CLT). This category has the highest level of pre-manufacture.
The Category 1 segment of the offsite market is more mature than some other categories. There are a number of large-scale Category 1 factories in the UK that have already been delivering residential MMC homes for some years.
These are two dimensional panelised systems, manufactured in factories and assembled onsite to form a structure. There are many differences within 2D categories: standard timber, cross laminated timber (CLT), steel, structural insulated panels and hybrid systems. Category 2 systems have the ability to be manufactured to a client’s own individual designs and house types. They can provide bespoke solutions to sites that might already have planning, without housing organisations having to go back to the drawing board. 2D panelised systems are also easier to transport so they are more suitable for sites with access issues.
The Category 2 segment of the offsite market is evolving rapidly with new products and manufacturers emerging all the time.
This includes the use of pre-manufactured components to form part of the structure of a building, mostly made from timber or concrete.
Typical types of Category 3 MMC components are driven or screw piles, pre-fabricated pile caps or ring beams, columns, walls and/or beams, floors, integrated columns and walls and beams, staircases and roofs.
This type of MMC solution relates to the 3D printing of parts of buildings and it can be done remotely or onsite.
Although this form of MMC is not available for widespread use in construction projects currently, it is expected to be in the future.
Category 5 covers pre-assembled components that do not form the structure of a home and can be used in isolation in an otherwise traditionally constructed project.
There are two main types of MMC Category 5: 3D components such as pods and 2D components such as façades, floors and walls.
Resources
Membership is open to professionals across the social and affordable housing delivery ecosystem including Registered Providers, local authorities, central government, MMC suppliers and others who want to take an active role in driving an uptick in social and affordable housing delivery.
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