What should you check before buying a 100 mm mineral wool wall panel?

Request the exact variant’s documents. Cover width sets out the installed façade; overall width includes the joint profile. Confusing them can leave a shortfall at the end or an unsuitable layout around windows.

Consider two 100 mm products. An exposed-fixing dual-density panel with 0.5/0.5 mm facings has U = 0.37 W/(m²K), weighs 17.0 kg/m² and has a standard cover width of 1,150 mm. A specific concealed-fixing variant has a corrected U-value (Uc) of 0.40 W/(m²K), a weight of 20.5 kg/m² and a 1,000 mm cover width.

This does not establish an inherent advantage for exposed fixings. These figures describe two particular constructions. Appearance, fire requirements or load capacity may govern the choice. The common thickness cannot predict the other properties.

Check temperatures on both sides and heating hours. A 100 mm panel can suit several uses but does not automatically meet every building’s thermal requirements. Use the selected panel’s U-value and the properties of openings and other wall elements in the calculation.

If the building will initially be unheated, ask about later use. A change of function may require different insulation, ventilation or surface protection. Identifying that before purchase can prevent the new cladding from obstructing a conversion.

Read reaction to fire and fire resistance separately. A wool core alone does not justify specifying 100 mm. The wall’s required rating must cover its arrangement, span and fixings. Additional seals and junctions with adjacent elements can be decisive.

Check whether the evidence covers vertical installation, horizontal installation or both. Do not transfer a rating for a shorter span to a longer one. Include doors and penetrations; the panel data sheet is not a design for the complete separation.

On an uninterrupted 11.5 m façade, ten 1.15 m modules cover the width. A 1 m module calls for another arrangement, such as eleven full modules and a properly detailed end piece. This is a geometry example; the termination must suit the system.

Windows may reverse the comparison: a wider module does not always reduce waste. Draw both layouts with supports and flashings. Check profile direction and visible joints. Only the resulting piece lists show the real order quantities.

Before approving cuts, verify that end pieces retain the edge needed for installation. Ripping a panel to width can remove part of the joint. The remainder is not simply a narrower standard panel: it needs a designed termination and fixing.

Panel lengths and weights affect lifting and transport. Confirm pack dimensions and unloading arrangements. Check safe storage and machine manoeuvring space. If these are overlooked, a small saving on material can disappear.

Include the correct fasteners, flashings and seals in the final quotation. Compare panel rates on the same scope. Specify the accepted configuration and permitted substitutes so the delivery is not reduced to any panel that happens to be 100 mm thick.