Selecting insulated panels
Comparing wall and roof panel prices in a single order
In brief
The price of a wall insulated panel and a roof insulated panel should be compared within a specific order. The profile, facings, core and connection details differ. The square metre alone does not describe the entire expense. First count the elements for both surfaces, then add flashings, fixings, transport and unloading. Prepare separate lists for the walls and the roof. On each, record the panel type, core, thickness, sheet parameters and coating. State the thermal requirements and other properties adopted in the project. The same core thickness does not make a wall panel and a roof panel equivalent items. Their geometry and method of use are different.
What data should the comparison start with?
List the pieces and lengths. Include drawings of openings and connections. For the roof, account for the pitch, cut-outs and any cross joints. For walls, the laying direction and the division at windows or gates are important. A quote request prepared in this way reduces the number of assumptions the seller would otherwise have to make independently. It also makes it easier to catch a missed item.
Which surface should be multiplied by the price?
Check the basis of settlement stated in the offer. It may refer to the agreed effective area or another commercial measure. Do not confuse it with the area of the wall outline itself. Buying full panels, cuts and openings cause differences. In the table, it is worth showing both the ordered quantity and the area of the finished partition.
For example, a wall with a window does not always allow the entire opening area to be deducted from the order. If the opening is cut into full panels, the material was needed for their delivery. In another layout, shorter elements are ordered above and below the window. The choice results from the construction and the detail. This is precisely why the cutting plan should precede the price comparison, rather than being created only on site.
What does a simple calculation of the whole order look like?
Let us assume a model: 68 m² of wall panels at €27.31/m² and 42 m² of roof panels at €35.64/m². The rates are examples and are not a current offer. The walls cost €1857.08, the roof €1496.88, and the panels alone together €3353.96. In this calculation, all values must be treated on the same tax basis.
Allow €416.61 for flashings and seals, €150.44 for fasteners and €277.74 for delivery and unloading. Materials and delivery then come to €4198.75, or €844.79 more than the panels alone. Installation is priced separately. When comparing quotations, check which of these items each supplier includes in the price per square metre.
Why must the extras be calculated separately?
Flashings depend on the length of edges, openings and corners. Two buildings with the same wall area may require very different quantities. A small structure with several gates has a different arrangement of details than a long, full façade. Similarly, a roof with installation penetrations requires a different set than a simple slope without openings.
Fasteners are selected to suit the substrate, component thickness and loads. Do not assume a single number of screws per metre for all zones of the building. Seals and tapes should also match the joint solution. In the quote, require the names of functions and the quantities of items. A general entry of ‘accessories included’ is convenient only when it is clear which accessories and to what extent are actually covered.
What should you check for transport and unloading?
The longest panel may determine the requirements for the vehicle and the equipment on site. In addition to the delivery cost, there are the conditions of unloading, waiting time and access to the site. A narrow entrance or lack of space to manoeuvre a bundle must be taken into account before setting the date. Short wall panels do not solve the problem of transporting one long roof element.
Ask whether the walls and roof will be delivered together or in two deliveries. Combined transport can be advantageous, but it requires space for storage and a compatible sequence of work. Check who provides the appropriate equipment and how long the material can wait before installation. Compare offers with the same method of delivery. Self-collection and delivery to the address are different scopes of service.
How can you spot a seemingly cheaper offer?
Compare parameters in adjacent columns. Check the thicknesses of the facings, the scope of the coating, the type of core and the dimensions. Mark missing items, surcharges and conditions for minimum quantities. The catalogue price may refer to a different version than the one you need. The final point of reference should be a quote consistent with the complete order drawing.
Do not add net amounts to gross amounts. Check the validity period of the price and how changes in length are settled. If one proposal involves less waste, show this in the number of pieces. If the other has a lower unit price, calculate the full order. The choice is then based on the real expenditure and technical compliance, not on the lowest number visible next to the product.
Questions before ordering
Is the total building area sufficient for comparison?
No. The areas of the building envelope, the division into elements and the details are needed. A floor plan does not show the quantity of panels needed for the walls and roof.
Does one invoice mean one transport cost?
Not necessarily. Deliveries may be split. The conditions of transport and unloading must be recorded in the order regardless of how it is invoiced.
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