Steel profiles type: Sigma

Cold-formed sections, cold-formed profiles. Sheet metal thickness up to 3.5 mm. Wide range of perforation patterns. High load-bearing capacity parameters.

Where to buy? Product data sheet

Product description

Profile Σ

Cold-formed structural profiles of the Σ-type are made from cold-rolled steel

Cold-formed thin-walled profiles have long been an integral part of the light industrial construction market. The wide variety of strength parameters of the sections allows for the optimal selection of the required material. These products are characterized by very high load-bearing parameters, while maintaining a relatively low weight.

Σ (Sigma) profiles, also available in the “with flanges” variant (Σ+ (Sigma+) Profile), are one of the four basic profiles we offer, alongside C-profiles, Z-profiles, and U-profiles. Its ribbing provides a special “shelf” inside the profile, which can additionally be perforated. Numerous ribs, combined with the possibility of using sheet metal with a thickness of up to 3.0 mm, allow for achieving very high load-bearing capacity parameters.

The wide variety of strength parameters of the profiles allows for the optimal selection of the required material amount – we encourage you to explore our full range of cold-rolled sections.

Technical specification of the coating

Basic colour

Available colours

All

ZM – magnelis

Pruszyński Company guarantess realization of each order in one colour shade. Although due to technological process of covering paint to steel shets there is possibility for occuring difference in colour shade in different deliveries.

Regarding this please inform sales person if different delivery is continuation of previous orders.

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Technical specification

General information

Technical details and parameters of cold-formed profiles type: Σ. They are made of high-quality S350 GD or S390 GD steel (on request). They have a specially developed profile which, thanks to appropriate bends, offers increased permissible load-bearing parameters, even with a smaller thickness of the input material. NOTE Σ-profile purlins can use sheet metal with a thickness of up to 3.0 mm. The variant "with flanges" – Σ+-type profile, can use sheet metal up to a maximum thickness of 2.5 mm.

Height - H:

140 - 350 mm

Height - h:

30 – 240 mm

Shelf width - B:

70 mm

Sheet thickness:

1,50 / 2,00 / 2,50 / 3,00 / 3,50

Hole

yes

Material:

S350 GD, S390 GD (coating ZM120)

Product profile

PROFIL Σ	thickness	weight	H	h	B
	mm	kg/m	mm	mm	mm
Σ 140	1,50	3,84	140	30	70
	2,00	5,12	140	30	70
	2,50	6,24	140	30	70
	3,00	7,39	140	30	70

Σ 170	1,50	4,2	170	60	70
	2,00	5,6	170	60	70
	2,50	6,84	170	60	70
	3,00	8,21	170	60	70

Σ 200	1,50	4,56	200	90	70
	2,00	6,08	200	90	70
	2,50	7,44	200	90	70
	3,00	8,93	200	90	70

Σ 230	1,50	4,96	230	120	70
	2,00	6,56	230	120	70
	2,50	8,04	230	120	70
	3,00	9,65	230	120	70

Σ 260	1,50	5,28	260	150	70
	2,00	7,04	260	150	70
	2,50	8,64	260	150	70
	3,00	10,37	260	150	70

Σ 300	1,50	5,76	300	190	70
	2,00	7,68	300	190	70
	2,50	9,44	300	190	70
	3,00	11,33	300	190	70

Σ 350	1,50	6,36	350	240	70
	2,00	8,42	350	240	70
	2,50	10,44	350	240	70
	3,00	12,53	350	240	70

Holes

Profile Sigma is one of the most used cold-bended steel profile. In steel constructions of halls is used as spandrel beam and roof purlin as well as part of steel columns.

Fast and easy assembly is enabled by possibilty of preparing profiles with ready holes. There are 3 possible type of holes:

Ø 14
Ø 18
bean 19×25

Types and distribution of holes – Σ profiles

Recommendations

Transport recommendations

In case of transport organized by client, vehicle should have open carrying platform, which enables loading with fork-lift trucks.
Galvanised profiles have to absolutely protected from getting wet.

Storage recommendations

Oil and passing galvanized sheets is a protection against white corrosion only during transport.
Steps stored in packages cannot be stored in the open air or in rooms exposed to moisture and variable temperatures. Zinc and allusine coatings, in particular, not yet influenced by weather conditions, and therefore without a protective zone, are sensitive to water condensate with limited air access (sheet plate stored in packaging). Particular attention should be paid to unloading in winter conditions and storage in heated warehouses. As a result of a significant temperature difference between the sheets, water precipitates.
Steps soaked during transport or storage should be dried, then put the profiles to spacers enabling free air circulation. After drying, galvanized (allusine) sections should be viewed and covered with a layer of preserving oil.
Steel sheets intended for longer storage should be viewed and then covered with a layer of machine oil – for galvanized and allusine sheets.
The result of not compliance with the above recommendations is the formation relatively quickly (for galvanized and allusine sheets it can be only a few days) of zinc corrosion – i.e. white, loosely related to the ground layers, not providing corrosion protection.

Do you have questions?

Is it possible to install copper flashings on a steel roof?

Caution must be exercised when using copper, as copper oxides are highly corrosive and cause corrosion of other metals. For this reason, it must not be combined with other types of metals on buildings (copper reacts upon contact and causes electrolytic corrosion of other metals).

Why are metal roof tiles recommended for renovating old roofs?

This is directly related to its light weight. In the case of old roofs, the roof trusses of renovated houses are often already somewhat worn down by time. Therefore, it is safer to use metal roof tiles, which weigh around 4.7 kg/m², rather than ceramic roof tiles, which are nearly ten times heavier. However, it’s always a good idea to have a specialist inspect the condition of the roof truss and confirm whether it requires renovation or replacement after all. In such cases, the safety of the building’s residents or employees, as well as the installation crew, is always the top priority. In most situations, however, the condition of the structure allows for the use of metal roof tiles without major issues, whereas the use of ceramic roof tiles would no longer be possible.

Can I use an angle grinder to cut sheets?

Modern roof coverings preclude the use of angle grinders for cutting. Using this method to cut the material will void the Warranty.
An angle grinder generates a great deal of heat during operation and cutting, which in turn damages the edges of the sheet metal as well as its protective coating. Additionally, the metal shavings produced during operation become embedded in the sheet metal’s surface, creating potential corrosion sites.
The proper way to cut sheet metal is to use automatic nibblers or hand shears. These tools use mechanical force to cut the sheet metal without exposing it to extreme temperature fluctuations. Additionally, it’s worth remembering that after cutting, it’s a good idea to protect the cut edges with a dedicated protective varnish or special paint.

Does the roof need maintenance?

Yes, every roof requires periodic inspections to check for any damage. Most products offered by the Blachy Pruszyński Company are available with various types of specialized coatings (covered by Warranty) that increase the service life and durability of metal roofing. Maintenance mainly involves removing soot and chimney dust, which, if left for an extended period, can damage the metal sheeting. Particular attention should be paid to the areas around chimneys, which are critical due to more demanding operating conditions. If localized damage to the paint coating is noticed during an inspection of the roofing, touch-up painting should be performed. In such situations, the best solution is to use dedicated touch-up paints matched to the specific coating. The Blachy Pruszyński Company offers such paints as part of its regular product line, and it is strongly recommended to use the company’s products that are recommended for the specific coating.

How to register and how does the warranty work?

In order to register the warranty, download the warranty registration available in files for download / printing or directly:
Warranty registration and send it completed to the following address: guarantee@pruszynski.eu

The warranty begins to apply on the day of purchase of the goods. Registration of warranty is necessary to quickly identify the purchased batch of goods.

How can I advertise a product? Where can I find more information?

Complaints should be filed at the wholesale store where the purchase was made. If the wholesale store in question has closed (is no longer in business), the completed complaint form should be sent directly to Pruszyński Company at the following address: pruszynski@pruszynski.com.pl

A complaint form is available in the "Downloads / Forms" section or directly here: COMPLAINT FORM

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News

10.06.2026 CSR, Sports sponsorship

Ultra Duch Puszczy 2026 – The Blachy Pruszyński Team on the Courses of the Podlasie Ultramarathon

The Białowieża Forest, hundreds of kilometers of challenging routes, and the unique atmosphere of a cycling adventure. Our company was well represented at the Ultra Duch Puszczy 2026. Blachy Pruszyński was a partner of the event, actively supporting one of the most recognizable ultra-cycling events in Poland.