How to prepare the supporting frame for a mineral wool sandwich panel wall

Only use panels to brace an entire industrial building where this function has been specifically designed and verified. Racking, machinery and heavy building services also need their own load paths to supports designed to carry them.

Vertical wall panels generally require horizontal rails at suitable intervals. With horizontal panels, the positions of the vertical supports and the detailing of the end joints matter. Determine spacing from calculations and tables for the actual product, facing thicknesses and structural arrangement.

A span given for a panel of similar thickness may be unsuitable if the core or interlocking joint differs. Surface colour, thermal exposure and deflection limits must also be considered. An arrangement that carries the design loads may still exceed a deflection limit or fall outside the wall’s fire classification.

Before installation, check the plane of the supports, their vertical alignment and straightness against the permitted tolerances. Drawing a panel against a crooked frame with screws can distort it and prevent joints from closing properly. The distortion may only become visible in low-angle light on the finished façade.

Correct the frame using an approved method before covering it. Loose offcuts used as improvised shims may not provide lasting support. Record the measurements, particularly when different contractors install the frame and the cladding. This allows deviations to be resolved before there is a dispute about the finished surface.

An existing building and a new extension can move differently under load or as temperatures change. Detail the cladding joint between them to allow the intended movement. A panel beside a large door must also work with the door frame without taking loads it was never designed for. Mark these locations on the drawings before the rails are fabricated. A clear division of structural functions reduces the risk of cracked seals and deformations that are difficult to trace later.

Large doors, personnel doors and windows change the support layout and how the adjoining panels span. Design the framing, the transfer of loads from each opening unit and the space needed to fit weathertight flashings. Cutting a large opening into a finished panel without assessing it can leave part of the wall unsupported.

If a second large door is likely, framing for it now can reduce dismantling later. The opening itself can wait. The aim is to allow future alterations without weakening the wall or suspending sections of it from makeshift supports.

When removing old cladding, examine the rails, welds, bolts and anchorages. Parts previously hidden by a panel may be damp or corroded. A fresh coat of paint cannot restore steel lost to corrosion. Base the repair scope on a structural assessment.

Compare the weight of the old and new cladding. Also check the area of wall loading each fastener, the support arrangement and the response to temperature changes. Complete any necessary work while the frame is exposed, because later access may mean taking the wall apart again.

Installers need a dimensioned layout showing the supports and fixing positions before work starts. At handover, check dimensions, the condition of the corrosion protection and the locations of the prepared openings. Resolve discrepancies before fixing further panels.

Keep photographs of the frame and any details that will be concealed. When replacing a damaged panel, they can show where the supports are without exploratory drilling. A well-prepared frame also makes future alterations easier, reducing the cost of adapting the building to a new use.