• Approved


  • PM Design
  • PM Manufacture
  • PM Construction


  • Sky House Co. Light Gauge Steel Frame Building System

Sky House Construct Ltd are house builders, place makers and curators of blended communities that are naturally sustainable, durable and award-winning by design.

Sky House Co. Light Gauge Steel Frame Building System

Sky House Co is a design company offering high quality cold-formed structural steel framed dwellings to the general public. The open panel system is manufactured offsite and erected at site. The internal and external load bearing walls along with floor and roof cassettes are erected.

The floor cassettes are boarded on the upper face to provide a working crash deck (not the finished floor) with an approved, suitably experienced contractor for manufacture, supply and installation of the LGSF building system. The sub-structure must be constructed to meet the level and out-of-true tolerances specified by the system designer. Steel shim packers must be used where required. Maintenance of the specified tolerances is critical in achieving accurate assembly of the system on site. The structural elements are structurally interconnected to provide composite action in accordance with the requirements of the UK structural codes and as specifically designed for each structure. Applied cladding must not exceed the loading limits for the structures. Sky House in conjunction with the LGSF supplier must agree the proposed finishes to ensure that structural and environmental factors will not adversely affect the durability of the system.

The system may be used to form individual site assembled panels, factory assembled volumetric units, or as infill to a primary structure. The system comprises a range of S390GD + Z275 galvanised, 1.0 to 2.0 gauge, lightweight steel sections produced to BS EN 10326. Z450 or Z600 galvanising can be used where required due to site specific environmental conditions. 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. 150, 200 and 250mm deep C sections can be used for high panels, floors and roof panels. Alternatively steel lattice joists may be used for floor and roof panels if required for span and loading conditions. This will be determined by project specific calculations. 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.

Durability Assessment – 60 Years

Limits on scope

  • Maximum 9 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 1500mm2/linear metre, or 500mm2/m2 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 minimum 25mm drained back-cavity.
  • 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.
  • Sky House and EOS Framing Limited 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.
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