T35 trapezoidal steel sheet: practical benefits and price per square metre

The letter T indicates the trapezoidal shape of the profile, and the number refers to its height. In one of the available variants, the height is 35 mm, the cover width is 1050 mm, and the overall width is 1090 mm. This is an example of a specific geometry. Another product from the same family may have a different rib pitch, width or shape of the edge rib.

These differences affect the connections and the layout of the sheets. Elements should not be combined on one roof slope solely on the basis of the T35 designation. The order should include the exact model and the roof or façade variant. The installation direction and the side with the selected coating must correspond to the intended use of the product.

The trapezoidal ribs stiffen the thin sheet and create a clear, simple surface pattern. T35 is suitable for sheds, garages, agricultural buildings and parts of commercial buildings. Sheets cut to the ordered length can reduce the number of transverse joints. However, their length must be reconciled with transport and the lifting method.

The profile is relatively light compared with many heavy coverings. This does not mean that an assessment of the existing roof structure may be omitted. The roof also carries snow, wind and loads during works. The selection of T35 should be based on the documentation for the specific sheet and the structural conditions of the building.

A higher profile can achieve more favourable stiffness than a lower one at comparable thickness and material. However, the permissible support spacing results from load tables or calculations. The number of spans, the support width, the steel thickness and the assumed deflection limit are relevant. There is no single correct spacing for all T35 sheets.

A distinction must be made between the load-bearing capacity of the sheet itself and the fastening. In the edge zones of the roof, wind suction may differ from that in the middle. The arrangement of the fasteners should take this into account. Likewise, a sheet must not be selected for photovoltaics solely because it has a high rib. Additional loads require verification.

An indicative catalogue example dated 28 October 2026 for T35 steel sheet 0.5 mm thick with a 25 µm polyester coating is €9.20 net per m² of coverage. At a rate of 23% this gives €11.31 gross. The price relates to a specific variant of the sheet alone. It is not a current sales offer or a quotation for a finished roof.

In the same example, a square metre of total surface area costs €8.80 net, that is €10.82 gross. The lower figure results from a different basis of settlement. Part of the sheet width disappears in the fold. To compare offers, therefore, the same unit and the same scope of supply must be used.

For 100 m² of actual coverage, the sheet alone from such an example gives €920.00 net before allowing for waste and other components. This is purely an arithmetic operation on the stated catalogue price. It does not determine the material cost for any roof of similar area. Its geometry may increase the quantity ordered.

The roof cost includes eave and side flashings, the ridge, fixings and details at penetrations. Depending on the construction of the building envelope, an underlay, substructure, insulation and ventilation are added. Transport, unloading and waste resulting from the geometry of the roof slopes must also be included. The building footprint area alone is not sufficient for ordering.

If protection against condensation is required, a variant with a suitable anti-condensation layer can be considered. It must be able to dry out. It is not insulation and does not replace a complete roof assembly above a heated interior. Its use should correspond to the product documentation and the humidity conditions of the building.

Prepare the dimensions of the roof slopes, the pitch and the support spacing. Specify the thickness, coating, colour and sheet lengths. Ask for a breakdown of total area and covering area. Check whether the quote includes all flashings, fasteners and transport. In unusual surroundings, the suitability of the coating must also be confirmed.

For installation, plan for cold-cutting tools and the removal of swarf. Long sheets must be lifted so that they do not buckle. The final choice of T35 should combine performance with ease of execution. A higher profile number alone or the lowest price per metre does not answer whether the roof will be correctly designed.