Where can you use a 60 mm mineral wool panel, and how do you check a 40 mm offer?

Establish the temperature difference across the wall, the humidity and the wall’s function. An internal partition may need a particular fire resistance rating even if thermal insulation is of little importance. Its location indoors is only one part of the specification.

One example of a 60 mm mineral wool wall panel has a stated Uc of 0.66 W/(m²·K). This figure applies to that variant and illustrates the limits of thin cladding for heated buildings. Check it against the design requirement for the complete wall before considering it as an alternative to a much thicker panel.

For intermittently used rooms, consider the heating and ventilation pattern. Warm air can improve comfort quickly while junctions remain cold enough for condensation at high humidity. Assess these conditions along with the space saved by a thin panel.

Some manufacturers’ ranges of mineral wool wall panels start at 60 mm. Other systems may have a different range. For a 40 mm offer, ask for the data sheet and declaration of performance for that exact product.

Check the technical designation, core, intended use, facings and how the thickness is measured. An insulation board for on-site build-up, a panel with a different core and a self-supporting sandwich panel are distinct products. A photograph of a white facing and the description “40 mm panel” cannot distinguish them.

A panel range may cover several thicknesses with different declared properties. Read the 60 mm column or the separate entry for the size on offer. Check the footnotes and any entries indicating that no performance has been declared. Leave a blank entry unresolved until the supplier confirms the required property for the version you intend to order. A figure from an adjacent column applies to that other variant.

The non-combustibility of mineral wool alone does not establish the fire resistance of a thin wall. An entry marked NPD means “no performance determined” for that characteristic. A rating from a thicker panel in the same range cannot fill the gap.

If the partition must achieve an EI rating, select a wall assembly within the scope of the relevant classification. Include the junctions with the floor, the slab above and adjoining walls. Ease of installation does not reduce the fire protection requirements.

Allowable span depends on the complete panel construction and the loads. Check the permitted height and select supports, fixings and framing around openings. Allow for the weight of doors and the loads caused by frequent opening.

In a small store, a trolley, crate or corner of a rack may strike the wall. Consider an independent impact barrier at low level. Thin panels can work well where the operating layout and protection keep impacts off the cladding.

A thinner panel may save weight and space but require a different support layout. Extra rails, flashings or reinforcement can change the total price. Compare complete partitions of the same size and function, including doors and installation.

Allow for a change of use. If a dry store is later converted to a heated workstation, the original partition may need rebuilding. Record the limits of the chosen system so the owner can assess future changes to equipment or operating temperature.