10 COMMENT


LGSF across the new schools programme therefore supporting the Government’s push for greater use of offsite, as well as the “Build Back Better” initiative.


LGSF challenges traditional methods of construction in low rise residential as well, with more and more builders looking to use this system for two or three storey individual houses on schemes across the country. Major firms who have had the foresight to adopt this method are seeing the benefit in terms of reduced remedial work post-completion, thanks to the lack of shrinkage and movement (preventing cracking at plasterboard seams and fixings). LGSF is a regular contributor to the volumetric modular sector, with components used as floor and roof joists, as well as wall infills supporting the inner and outer leaf treatments. Either loose or panelised, these bring a lot of advantages, starting with the component itself being rolled in different depths and using different gauges – allowing the system to be precisely sized to fit. The growth in the UK has been exponential, and so have the engineering and detailing support resources. Standard methods of connection are Tec screw, bolt or rivet depending on the manufacturer’s preferred solution, but all are accepted within the industry.


Co-ordination within the engineers and detailers can be seamless with the deployment of BIM throughout the design process; production of a 3D model shared easily in IFC format. This allows the consultants to check for clashes and co-ordination, reducing or eliminating issues onsite. This also applies when there is a requirement to combine with hot rolled steel (either as individual components, steel frames or cages).


Early involvement


When considering offsite construction methods, it is crucial there is early discussion between the architect and structural engineer about the system to be adopted, even prior to the decision on choice of material. LGSF systems are incredibly flexible, but not universal; all have their advantages and disadvantages. Involving a specialist engineer early on provides the project team with various key advantages:  Structural issues can be identified and discussed, avoiding later costs of any changes required


 Accurate early ‘loading down’ information cuts delays in getting the information to the foundation engineer (if going the subcontractor route you will need to wait for the information until after appointment, they will then have to appoint an engineer to produce details)


 Accurate structural information can then be shared with all subcontractors


 Changes during the design process can be discussed with other parties in the design team, saving on cost.


There are specific advantages for architects of this approach:  Identifying right system for the project (not all are fit for the same purpose)


 Understanding of the system from the outset – being able to discuss the benefits and limitations should help define the structure


 Identifying any potential issues before final decisions are made.


System limitations & further considerations LGSF is a very flexible system suitable for different structure types, from small extensions, SFS infill or oversailing wall systems, and open plan portalised frames, to multi-storey structures. With LGSF


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We have in recent years seen cold rolled replacing hot rolled steel in areas such as small to medium portal-framed and beam and column structures within the retail, commercial, agricultural and leisure industries


structures being required to go higher, hybrid solutions need to be considered to overcome systems’ individual limitations. The higher you go, the greater the requirement for racking (X-braces, K-braces or portalised frames), therefore walls that can accommodate those are needed within the floor plan.


Large open areas within a building (such as hotel entrance lobbies, kitchens, restaurant dining rooms) require a deeper supporting structure, affecting overall floor depth and overall floor to floor distance. LGSF systems also require secondary fire protection in the form of fire rated board. Despite these considerations, systems have compelling benefits, such as their exceptional light weight, greatly reducing load on foundations. LGSF structures are made using cutting edge technology with material rolled and cut to in a bespoke 3D modelled way, reducing wastage significantly. The technology also minimises any occurrence of human error.


LGSF elements have been refined over time to maximise their structural capacity, again meaning wastage is minimised, and projects with the highest strength to weight ratio possible. Lastly, section profiles can be recycled meaning the systems can help meet green goals.


Marian Kubisz is managing director and owner of Adept Consulting (UK)


ADF OCTOBER 2021


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