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  • JRL Modular Ltd High-Rise Steel Framed Modular Volumetric Building System

Description of the JRL Modular Ltd High-Rise Steel Framed Modular Volumetric Building System

Manufactured in the United Kingdom, the factory assembled modules are transported to site and assembled in sequence on a prepared sub-structure. The majority of JRL
Modular Ltd projects are ‘turn-key’ projects, with JRL Modular Ltd responsible for the entire build from demolition, construction to handover and aftercare. However, there are some projects where JRL Modular Ltd partner with others and act as a specialist subcontractor. The scope can vary depending on the contract, for example, it may or may not include the installation of the cladding. In the circumstances that JRL Modular Ltd act as a specialist subcontractor, key building interfaces such as cladding, services, fire detailing, etc. must have JRL Modular Ltd’s approval and be carefully designed to ensure sufficient coordination to the Modular package of works.

The system is designed to enable it to be stacked to 30+ modules high, subject to structural verification. Structural calculations for a theoretical building with the modules stacked to 32 storeys high have been provided by JRL Modular Ltd for this assessment.

Durability Assessment: minimum 60 years

Limits on scope

  • Maximum 30+ storeys subject to structural analysis.
  • Bottom members in contact with foundations/sub-structure/podiums 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 next to the ground, 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 required by the cladding manufacturer.
  • Rendered external thermal insulation systems and/or insulated brick slip cladding systems applied to steel-framed structures must have a minimum 15mm drained back-cavity. The application of insulated cladding systems should be considered to minimise the risk of water entering the structure at vulnerable junctions, for example window jamb/sill junctions, in accordance with the recommendations of the Steel Construction Institute publication P343.
  • Stainless steel fixings, such as channels for masonry retention systems, must be isolated from the galvanised steel to prevent bi-metallic corrosion.
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