What does a 40 mm wall sandwich panel cost, and when is it suitable?

A 40 mm panel may be considered for partitions and enclosures with lower thermal requirements, including some unheated spaces. This does not remove the need to check wind loading, support arrangement, moisture and fire requirements.

The manufacturer’s 2026 catalogue gives Uc = 0.58 W/(m²·K) for the PWPIR-S 40 mm wall panel and 0.22 W/(m²·K) for the 100 mm version in the same family. These values apply to selected configurations, not all panels with that core. Sharing a foam type is not enough to establish suitability. Select thickness for the building conditions and the required insulation of the complete wall.

An advertised price may concern a short remaining batch, second-grade material or one facing configuration. Without those details it cannot fairly be compared with newly manufactured, made-to-length material. Transport and unloading may also be excluded.

A calculation can use any clearly stated assumption, for example PLN 200 excluding VAT per m². This is an illustrative calculation rate, not a current offer for a 40 mm wall panel. Replace it before ordering with a quotation for the actual material, quantity and date. Check that the facings and grade match: otherwise even accurate arithmetic produces the wrong budget.

Facings are important: their thickness, surface protection and profiling affect product properties. Colour, lengths and batch size also matter. List these features separately in an enquiry instead of reducing them to “standard panel”. A cheaper option may differ precisely in a feature omitted from that brief description.

Have material and delivery costs itemised. Establish whether the supplier can provide suitable lengths. Building a short wall from long stock panels can produce considerable waste. An additional discount per square metre helps little if the purchased area greatly exceeds the area used after installation.

Suppose ten panels are each 3 m long with 1 m effective cover width. They form 30 m² before openings are considered. At a quoted rate of P PLN excluding VAT per m², the panels cost 30 × P. Flashings, fixings, seals and delivery are added afterwards.

If 4 m panels must be purchased and each shortened, the purchased area becomes 40 m². At the same rate, another 10 m² must be paid for. This is our own worked example, not a sales offer. It often reveals more than comparing “promotion” or “lowest price” slogans. Check whether the offcuts can safely be reused.

Obtain the reason for downgrading and the batch documentation. Inspect joints, surfaces and the bond between facings and core. A cosmetic defect can have different implications from delamination: a sandwich panel relies on both sheets working with its insulating core.

Do not assume a 40 mm version is inherently less demanding to install. Overtightening can damage a facing, while an unsuitable screw may not secure the panel correctly to its support. Screw type, length and quantity must follow the system and design, not the material’s purchase price.

Consider it if the building will be heated or its use may change. Assess how thickness affects heat loss and the complete wall. Do not assume insulation can be added at no cost years later: alterations may need new details and a moisture assessment.

Decide before ordering flashings and fixing lengths, since a thickness change affects both. Compare two complete quotations. Sometimes a higher panel price represents only a modest increase in the overall construction budget. Establish this using actual offers rather than assumed rates.

A sample helps assess profiling and colour. It does not confirm the lengths, facing thicknesses or condition of a future delivery. Record the full configuration in the order, including both coating designations, and check that the price covers every required length. Compare delivery labels with this schedule so an advertised thin-panel price is not confused with the cost of another configuration.

Thickness alone cannot establish that. A heat balance, the design requirements and an assessment of the complete building element are needed.

Not necessarily. A quotation should state its date, validity period, product specification and delivery terms.