MMC techniques

As the name implies, where these systems are used, the manufacturer produces a large factory-made panel from either wood or metal. The panel is then either delivered as it is, or enhanced depending on the client's wishes. Enhancement could be adding insulation, services, internal or external facings, windows and doors, or all of these. Completed panels are then delivered to site and fitted together. The way in which the DPC works, or the interaction between internal walls and the roof may differ from project to project. Often the contractor or developer will be choosing the materials and forms of construction for other parts of the building. By using highly energy efficient foam insulants, the thickness of timber can be reduced as low as 89mm.

Galvanised light steel C-section metal can also be used for metal-framed buildings. The insulation is added to the outer side to prevent cold bridging. The frames are used for the walls, floors and roof trusses and are used in combination with a wide variety of other products, including traditional brick outer skins, cladding, insulated render and screed floors. There are also mobile rigs that allow the frame to be made on site.

Concrete panels have been around for many years (in high-rise blocks of flats for example) and concrete panels with brick slip facings are also being manufactured. Another variation is 'structurally insulated panels' or SIPs. The panels consist of an outer facing of timber-based boards bonded to rigid insulation. They fit together with male/female joints and are clamped together on site. They are very strong and can be used in roof and wall construction.

Figure 1: Hospital extension with self-supporting Metek structure walls and flooring

© This photograph is reproduced with permission from Metek Building Systems - part of the MMP Group