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Load-bearing trapezoidal steel sheets: what to check before selection

Structural trapezoidal sheeting is selected on the basis of load-bearing and stiffness calculations, not just the profile height. Before choosing, check which static scheme the table refers to, whether the load direction is accounted for, and what the support spacings and widths are. A distinction must also be made between load capacity and deflection, and the choice of fasteners verified, especially in edge zones. The offer should state the profile designation, core thickness, steel grade and laying position. Design decisions are left to the designer.

By |2026-11-15T00:57:13+01:002023-09-30|Blog|Comments Off on Load-bearing trapezoidal steel sheets: what to check before selection
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Re-roofing after asbestos cement: which material should replace it?

First, establish what material the existing covering is made of and what condition the roof structure is in. Consult the building records and identify the type of the current layer; if the composition is doubtful, do not go by appearance alone. Where asbestos is present, entrust dismantling to a specialist contractor. As the new covering, consider metal roof tiles, T18 or T35 trapezoidal sheeting, or insulated roof panels in suitable buildings. The choice depends on pitch, support and building use, so leave structural decisions to the designer.

By |2026-11-14T21:01:18+01:002023-09-22|Blog|Comments Off on Re-roofing after asbestos cement: which material should replace it?
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How does T35 trapezoidal steel sheet differ from shallower profiles?

T35 trapezoidal sheet stands out with a higher profile than T18, which may increase sheet stiffness and broaden its possible applications. However, not every T35 has the same load capacity, width and coating, so it is worth checking the drawing of the specific section, the steel grade, the sheet thickness, and the support spacing and span pattern. A comparison with a lower trapezoidal profile should rely on the same conditions and consider both load capacity and deflection. The choice of profile depends on the full specification and roof requirements, not on rib height alone.

By |2026-11-14T20:59:08+01:002023-08-29|Blog|Comments Off on How does T35 trapezoidal steel sheet differ from shallower profiles?
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Choosing T18 or T35 sheeting for the roof of an open shelter

In Poland, the choice between T18 and T35 sheet for a shelter roof depends on the span, loads and method of support. Before comparing profiles, check the location, height and surroundings of the structure, because an open design is exposed to wind action from below as well. Take into account the roof pitch, water drainage and the risk of condensation. Pass these data to the designer or the person selecting the covering. Only then compare load capacity, tightness and conditions of use, and finally the price.

By |2026-11-14T17:32:10+01:002023-04-28|Blog|Comments Off on Choosing T18 or T35 sheeting for the roof of an open shelter
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Tile-effect or trapezoidal steel sheets for a roof?

The choice between a tile-effect metal sheet and trapezoidal sheeting depends on the roof geometry and support arrangement, not on the category name alone. Tile-effect sheet has longitudinal and transverse pressings forming repeated modules, which affects batten spacing and sheet fitting; trapezoidal sheeting has a simpler pattern of ribs running along the slope, and profile height shapes structural properties. Check the minimum pitch in the specific product's instructions, the batten spacing set by the module or profile parameters, and the condition of existing substructure during renovation. Compare both variants drawn on the same roof, including laps, flashings and offcuts.

By |2026-11-15T00:58:13+01:002023-04-18|Blog|Comments Off on Tile-effect or trapezoidal steel sheets for a roof?
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Replacing a T18 or T35 roof: checks before changing the profile

Switching from T18 to T35 is not simply a matter of choosing a trapezoidal sheet with a higher profile. It can change the cover width, the number of sheets and the detailing at the terminations. In a renovation, the existing supports must also be checked. Below we compare actual profile types and show how to go from their dimensions to the cutting plan and the complete order. The number in the name usually indicates the nominal profile height in millimetres. T35 has a higher rib than T18. However, this does not mean that the name alone determines the load-bearing capacity. The assessment requires the full geometry, the steel thickness and grade, and the support conditions.

By |2026-11-14T17:30:18+01:002023-04-13|Blog|Comments Off on Replacing a T18 or T35 roof: checks before changing the profile
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Choosing a covering for a heated or unheated garage roof

First decide whether the garage is merely to shelter a car or to serve as a workshop, and record this before choosing the covering. Check the roof pitch, the type of supports and whether the interior will be heated. For an unheated building, trapezoidal T18 or T35 may be considered, whereas a heated one requires a complete insulated partition or a suitable insulated roof panel. Allow for condensation, ventilation and drainage, since vapour can condense on the cold underside of the covering. A quotation should refer to a specific product, not merely a category.

By |2026-11-14T21:02:42+01:002023-03-24|Blog|Comments Off on Choosing a covering for a heated or unheated garage roof
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Affordable roof coverings for a house, garage or garden shelter

The lowest sheet price does not guarantee the cheapest roof, because the final cost depends on the shape of the slopes, the support, waste, flashings and labour. Before comparing offers, establish the function of the building: an open gazebo needs only rain cover, while a heated building requires a full insulation system, which changes the scope of work. Then check whether the quote includes all elements, not just the sheet metal itself. Compare the price per square metre of effective covering together with accessories and transport to avoid apparent savings.

By |2026-11-15T00:57:29+01:002023-03-20|Blog|Comments Off on Affordable roof coverings for a house, garage or garden shelter
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What helps when installing T18 and T35 trapezoidal sheets?

In Poland, the installation of T18 and T35 trapezoidal sheets is made easier by the regular profile and the option to order sheets in suitable lengths. Readers should nevertheless check the evenness of the structure, the layout of the sheets and the method of fixing, as these factors determine how the work proceeds. Longitudinal ribs establish the direction of laying and water runoff, and on a regular roof it is easier to plan bands from the upper edge to the eaves. Preparing sheets to length reduces cutting on site but requires accurate measurement that accounts for flashings, overlaps and the eaves overhang.

By |2026-11-14T17:32:32+01:002023-03-18|Blog|Comments Off on What helps when installing T18 and T35 trapezoidal sheets?
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How to choose the colour of trapezoidal steel sheet for an extension and later repairs?

The colour of the steel sheet is best chosen on a real sample, together with the type of coating. The same RAL number does not describe the gloss, texture or the appearance of a weathered roof. With an extension, matching to existing elements is also required. It is worth settling these matters before ordering the sheets and the complete set of flashings. The RAL designation organises the colour, but does not replace a full description of the product. In steel sheet catalogues one finds, among others, anthracite RAL 7016, grey-white RAL 9002 and shades of red and brown. The presence of a colour in the palette does not prove that it is the most frequently bought or available off the shelf.

By |2026-11-14T11:12:53+01:002023-02-28|Blog|Comments Off on How to choose the colour of trapezoidal steel sheet for an extension and later repairs?
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