Mockba Modular Light Gauge Steel Frame volumetric Building System
Durability Assessment: minimum of 60 Years
Construction System Comprises:
Mockba Modular Limited modules consist of LGSF steel framed container style boxes that are fitted out in the factory and installed on traditionally constructed foundations to meet the site requirements. The modules will be constructed to a 95% complete state internally. The system comprises a range of Z275 galvanised, 1.0 to 2.0 gauge, lightweight steel sections produced to BS EN 10326. C sections, typically 65 or 100mm form the internal and party walls. 100mm C sections can be used for external walls subject to engineering requirements of specific schemes, 150mm C sections are generally used to form the external walls. The system construction is based upon the ‘warm frame’ principle where insulation is placed outside the structural frame but generally this is installed on site by others. Wall panels are constructed with U section top and bottom rails with C section studs of size and spacing commensurate with the structural design.
Limits on scope:
- Maximum 5 storeys for loadbearing frames subject to structural analysis (with the incorporation of hot-rolled steelwork to achieve structural design parameters)
- Bottom members in contact with foundations/sub-structure must be fully isolated from contact with moisture from the ground or external sources
- Where lightweight gauge steel framing is used for ground floor construction, the ground below the floor must be sealed to prevent moisture entering the void, such as a membrane with 50mm oversite concrete, in accordance with the recommendations of Steel Construction Institute publication P262.
- Where a lightweight gauge steel frame ground floor occurs over a void next to the ground, the void must be cross ventilated to a minimum standard of 1500mm 2 /linear metre, or 500mm 2 /m 2 of floor area.
- Masonry wall cladding cavities should be minimum 50mm and ventilated.
- Conventional cladding, such as timber cladding, should have a minimum 25mm drained back-cavity, or as recommended by the manufacturer.
- Rendered external thermal insulation systems and/or insulated brick slip cladding systems applied to steel-framed structures must have a drained back-cavity to meet the system requirements.
- Stainless steel fixings, such as channels for masonry retention systems, must be isolated from the galvanised steel to prevent bi-metallic corrosion where there is a risk of exposure to moisture.
- Mockba modular Ltd must be contracted for the design, manufacture and supply of the structures.
- A chartered structural engineer suitably experienced in the design of this type of structure must be sub-contracted for the structural analysis and design.