Can sandwich panels brace a steel-framed building?

Columns, rafters or trusses collect loads over a substantial area and transfer them to the foundations. Purlins in the roof and rails in the walls connect the cladding to that primary frame. Check each stage in the load path, from the panel attachment through the steelwork to its supports.

Bracing keeps the building stable in three dimensions and directs horizontal forces to the appropriate supports. Braced bays may be located in the roof, walls or inside the building, depending on door openings and frame layout. A wall diagonal shown as permanent bracing must remain in place after cladding.

Stability also matters during erection. A single frame standing before the adjoining members are connected behaves differently from the completed building. Follow the sequence for frames and bracing and retain temporary supports until the stage identified in the erection plan.

Where the design relies on cladding action, it must specify the panels, fixings and route for the forces into the rest of the frame. Connection flexibility, fastener spacing and boundary members affect that action. Panel thickness and steel facings alone are insufficient to establish it.

A replacement cladding system must preserve any structural function assigned to the original. Cutting a large opening can interrupt the transfer of forces along a wall. Have stiffness and resistance checked before deciding the size and position of a new door.

Coordinate panel selection and frame design. Wide support spacing may call for a different panel depth, stronger facings or additional rails. Check span and deflection for the specified loads, the laying direction and the support available around openings.

Consult the load tables and installation details for the actual panel, including its facings. Similar core material and overall thickness do not guarantee equal spans. Dark external faces also heat up more in sunlight. Include thermal effects alongside wind loading in the design.

Repeated frame bays can simplify an extension, but the junction with the old building still needs assessment. Review the existing foundations, frame and bracing before adding new bays. A change in roof level may also alter where snow drifts form on the original roof.

Cable trays, ducts and heavy equipment need defined attachment points. Verify the allowable local load and intended fixing arrangement before suspending anything from a panel. This applies to agricultural buildings and warehouses as well as factories.

Consider a warehouse that needs a wide opening in a braced gable bay. The engineer must provide another route for the bracing forces and check its connections. The door frame alone cannot be assumed to do that job. Resolve this before ordering cladding so the opening fits the structural arrangement.

Keep the panel designation, support layout, fixing details and bracing plan with the steelwork records. As-built drawings should show approved changes. They save the engineer from reconstructing the original design assumptions from a site inspection during a later alteration.

Before a repair, recladding job or change of use, identify which panels, connections and frame members participate in the load path. Use the records to check a proposed opening or new equipment against the building as constructed.