Costs and orders
How much does a 40 mm panel wall cost and when does this thickness make sense?
In brief
A 40 mm wall panel can have an attractive price, but its application must first be confirmed. A thin panel is not automatically a good choice for a heated building. The cost also includes the structure, fixings and flashings. In a small wall, the fit of the module to the openings also has a major influence on the result. State the core type and confirm that it is a wall panel. A roof panel of the same nominal thickness has a different geometry and may have different properties. The facings and coatings are also important. The figure 40 mm alone is not enough to prepare a price comparison.
What is behind the name 40 mm panel?
Check the coverage module and available lengths. Two variants with a similar appearance may require a different number of elements. There should be no room for guesswork in the order as to whether the price refers to an effective metre, a total metre or a finished piece. Establish the unit before calculating.
Where can this thickness be considered?
It may appear in the selection of lightweight enclosures and rooms with specific, low thermal requirements. However, suitability is determined by the design and operating conditions. There is no basis for automatically constructing every unheated wall from the same panel.
In the example wall family, PIR 40 mm has Uc 0.58 W/(m²·K). This is a parameter of a specific variant. If the building has a demanding thermal target, a different solution may be needed. Saving on the panel itself should not lead to later, unforeseen additional insulation.
How does the module change the quantity of material purchased?
Assume a simple wall 6.4 m wide and 2.5 m high. Its area is 16 m². With an example module of 1.1 m, six panels are needed. The purchased coverage will be 6 × 1.1 × 2.5 = 16.5 m² before trimming the last element.
This is a simple example without openings. Doors and windows may change the cutting layout, but they do not always allow their entire area to be deducted from the purchase. The utilisation of strips and the position of edges must be checked. In a short wall, one additional piece represents a noticeable part of the cost.
It is also worth matching the strip height to the order. A 2.5 m panel cannot always be used to form a wall of that height if the detail requires a different finish at the plinth. The cut dimension should follow from the cross-section. First establish the levels of the bottom and top edges, and only then enter the lengths in the schedule.
How do you convert the contractual price per metre into a finished wall?
Assume solely for the calculation €23.14 net per m² of panel. For the purchase of 16.5 m², the material cost is €381.81 net. Converted per 16 m² of wall, this gives €23.86 net per m². This is not a current market price or an offer.
If the extras and the allocated part of the transport come to €150.44 net in this example, the total will rise to €532.25. That is €33.27 net per square metre of wall, still excluding the structure and labour. The example shows why the rate for the panel alone does not describe the final cost of execution.
Which accessories must not be omitted?
Assemble screws for the appropriate substrate, seals and flashings. Include the corners, the joint at the base and the finish below the roof. Openings require additional framing elements. Their quantity follows from the length of the edges, not from the wall area alone.
The number of fastenings should not be reduced on the basis of the low weight of a thin panel. Wind also acts on the wall. The spacing of supports and fasteners must correspond to the loads and to the panel variant. A shorter screw is not the right choice simply because it is easier to buy.
When should you compare with a thicker variant?
If the difference in material price is small, it is worth comparing the full performance effect. A thicker panel may provide a different thermal parameter, but it requires appropriate flashings and fastenings. The load-bearing capacity must also be checked. Not every change in thickness is neutral for the other elements.
The comparison should follow from the intended use of the building. If permanent heating is planned in the future, it is well worth taking this into account now. Do not assume that the insulation can be extended arbitrarily later. Adding it may require a reassessment of moisture and structure.
How to assess a cheap batch before purchase?
Check the actual condition of the facings, locks and ends. Second grade may cover various deviations, so a description of these is needed. Establish whether the batch has the required documents and whether it is suitable for the intended application. Do not assess it solely on the basis of a photograph of the top piece.
Finally, compile the full quantity, waste, transport and acceptance conditions. If missing elements have to be purchased from another system, check compatibility first. A good price matters only once the material allows a complete wall to be built in accordance with its requirements.
Questions before ordering
Is the price of a 40 mm panel always lower than the cost of a thicker wall?
The panel price may be lower, but the entire scope and the required effect must be compared. Additional works or later insulation upgrading may change the balance.
Does a thin panel require fewer screws?
This does not follow from the thickness alone. The fixing is selected according to loads, structure and the data for the specific panel.
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