What is a mineral-wool sandwich wall panel, and how do you choose one?

The facings and core act together in the finished element. It is not simply loose wool inserted between two sheets. The bond between layers matters to performance, so delamination needs assessment even if the outer steel still looks sound.

Panels can use exposed fasteners or concealed fixing within a specially formed joint. Both suit wall cladding but have different details. Do not substitute one for appearance alone without checking the design. The joint also affects load transfer, fastener quantities and installation.

In one example family, U is 0.39 W/(m²K) at 100 mm and 0.20 W/(m²K) at 200 mm. Another core construction gives 0.37 and 0.19 W/(m²K) respectively. These are selected variants. There is no single table for all mineral-wool panels; check the data for the product being ordered.

Lambda describes the core material, while U describes heat transfer through the panel. Assessing the whole wall also requires junctions and thermal bridges. A poorly executed base or joint can undermine good insulation, so choose thickness alongside the connection details.

A2-s1,d0 is one possible reaction-to-fire classification for a finished mineral-wool panel and must be confirmed for the selected variant. Wall fire resistance needs its own assessment of the complete assembly, including supports, orientation, fixings, joints and service penetrations. The material name is insufficient.

For acoustics, check the rating of the actual version. Example products may have Rw of 33 dB or 27 dB; these do not define a range for every panel. Doors, gates and other sound paths also affect the wall. Rw is not a measure of sound absorption inside a hall. Do not merge these different properties into a single “soundproofing” claim.

Panels are supplied in specified lengths and modular widths. The module determines coverage and may differ from the overall element width because the joint can project beyond it. Calculate quantities using the correct module and verify the distinction for the selected product.

Draw the façade layout and openings before purchase. Identify reusable offcuts and the installation sequence. Long panels can reduce joints but need suitable transport. Short lengths do not necessarily save money if they add flashings and supports.

A 10 m wide wall does not always need exactly ten panels. Divide the cladding width by the cover module, not the overall sheet width, then check the edge cuts and corner detail. Rounding the count gives only a preliminary quantity. The final layout must also fit openings, supports and connectable edges.

The manufacturer’s requirements include checking support geometry and conformity with the design. Select fasteners, seals and flashings accordingly and follow the specified panel arrangement. Overtightening screws is not a way to correct an inaccurate frame.

Use cutting tools that do not overheat the facings, remove swarf and protect edges. Give particular attention to the base, corners and openings. Even excellent catalogue performance cannot compensate for water reaching the core through an unprotected termination.

Specify the model, thickness, both facings, coating and colour, together with lengths and accessories. Request the documentation and scope of use. For outlet stock, establish each batch’s condition. A grade label alone proves neither full conformity nor a complete absence of declared performance.

Keep the installation records and an inspection plan. Schedule cladding inspections at least annually, taking account of the particular coating’s requirements. Check fasteners and flashings too, so defects can be found before moisture or corrosion spreads. Factory-made panels still require properly maintained cladding after installation.

No. A cladding panel needs appropriately designed supports and fixings.

Start with the wall’s requirements and a layout drawing, then choose the model, thickness, lengths and complete accessory set.