Costs and formalities
What affects the price of T18 and T35 trapezoidal steel sheets?
The price of T18 and T35 trapezoidal sheet depends primarily on steel thickness, coating type, profile and the unit of settlement — prices per gross and effective square metre are not the same. Before comparing offers, check whether the quoted rate refers to effective area and what share of the chosen sheet is taken by the side lap. It is also worth establishing whether flashings, cut-offs and transport are included. Examples from the price list of 28 October 2026 show differences between variants, but do not replace a quote for a specific order.
What prices does the current catalogue example show?
In the verified price list of 28 October 2026, an example T18 sheet 0.50 mm thick with gloss polyester has a table price of €8.60 net and €10.58 gross per effective m². A comparable T35 variant costs €9.20 net and €11.31 gross. These are specific catalogue items, not an averaged price for the whole market.
In these same examples, the matt polyester coating raises the price to €9.79 net for T18 and €10.40 net for T35 per m² of effective covering. The prices given relate to sheet with a specific geometry and coating. Delivery, discount, colour, order size and deadline can change the final offer. The values quoted serve to compare variants and do not replace a quotation for a construction project.
Why does a m² of total area cost less?
Part of the sheet width disappears in the side lap. The overall width describes the material purchased, while the effective width is the actual covering width. Therefore the price per m² of overall area is lower, although it relates to the same sheet. When comparing offers, both must be converted to a single unit. Otherwise the difference may look like a discount that does not exist in practice.
In the example given, the T18 price of €8.33 net per total m² corresponds to €8.60 net per effective m². For T35 these are €8.80 and €9.20 respectively. A different profile may have a different lap share. A fixed conversion factor should therefore not be applied to all T18 or all T35. The width of the specific sheet in the order is needed.
Also add the transverse laps to the calculation if the sheets are joined along their length. The effective width alone does not account for them. A cutting plan is therefore more accurate than simply multiplying the roof area by the price.
How does steel thickness affect the cost?
A greater thickness means more material, but it also affects the structural properties. In the same price list, an example T35 with a polyester coating and a thickness of 0.70 mm costs €14.03 net per effective m². That is clearly more than the 0.50 mm version. However, it does not mean that the thicker sheet should automatically be chosen for every roof.
Thickness is selected together with the profile, support spacing and loads. A sheet that is too thin does not become the correct choice just because it costs less. Conversely, an unnecessarily large reserve may increase the budget without benefit for the given system. The assessment should be based on the load table specific to the particular product and method of support.
What are you paying for in the coating?
The coating is responsible for the appearance and protection of the material in the intended environment. Its type, thickness and declared properties matter. Matt and gloss describe the surface effect, but do not replace the full specification. Not every matt coating has better resistance than every glossy variant. Specific systems must be compared.
In a building next to a busy road, in an industrial environment or near the coast, the requirements may differ from those in a quiet setting. A higher coating price should correspond to the needs, not just the name of the variant. Also check the warranty and maintenance conditions. A long warranty period does not mean equal protection of all surface characteristics.
How much do the components cost apart from the sheets?
The price of the covering must include the flashings, fasteners and seals specified in the system. A substructure or other base, drainage and installation are added. The anti-condensation layer is a separate option in selected profiles. Its presence does not replace thermal insulation. In a heated building, the correct arrangement of the entire building envelope will still be required.
In a small order, transport can account for a large share of the costs. Long sheets require a suitable vehicle and unloading. When purchasing in several stages, it is worth checking the risk of shade differences between batches. Plan delivery together with the installer. A wet pack left for longer without proper protection can mean losses greater than the discount obtained.
How do I obtain a reliable quote?
Provide the type of building, roof pitch, area and sheet lengths or a roof drawing. Specify the profile, thickness, coating and colour. If the structural design has not yet been carried out, do not present an arbitrary support spacing as a final requirement. First, it must be confirmed which variant is actually suitable for the task.
Ask for a breakdown of the total and effective area, all surcharges and the final gross amount. Check the validity of the offer and the delivery date. When comparing two proposals, note the differences in material and scope. Only such a calculation shows the purchase cost of T18 or T35. The lowest figure next to the “€/m²” symbol is only the beginning of the conversation.
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