Stairs indoors and outdoors can fulfil many different functions being a creative design element that exercises a significant influence to the architecture of a building and not only for overcoming height differences and fall protection.
For the design of comfortable and safe steel steps, the following requirements must be observed:
Step height: ≤ 190 mm
Step depth: ≥ 260 mm
Safety rule: Step depth + step height – 460 mm
Step length: Step depth + 2 step heights – 620 +- 30 mm
Convenience rule: Step depth – step height – 120 mm
During the installation of steel staircases, due to planned and / or local conditions, many different carrying systems are possible:
- Cut string stairs
- Double stringer stairs
- Spiral staircase
- Industrial stairs
- Emergency staircase with open steel structure
- Special staircase
Stair systems can be built by using the combination of different bearing elements. Self-supporting railings can disperse the loads. Steps made from folded sheet steel that are only held at a few points can be dimensioned extremely thinly.
Our stairs are built according to these standards:
ITM (Inspection de Travail et des Mines / Luxembourg)
DIN 18065 (Stairs in buildings)
DIN EN ISO 14122-3 (Permanent means of access to machinery)
BGI/GUV-I 561 (Employer’s liability insurance association, Germany)
Drafting aid for steel stairs, information sheet 355.
We inform you that the width of the stairs is dimensioned according to the set of rules:
Minimum usable staircase width
Staircase required by building law: 100 cm
Residential building max. 2 flats: 80 cm
High-rise buildings: 125 cm
Schools, hospitals: 120 cm
A reviewable statics certificate and the required construction drawings will be prepared by us:
The statics of the staircases is calculated according to the following criteria:
Light version ≤ 1.0 KN/m2
Medium version ≤ 3.0 KN/m2
Heavy version ≤ 5.0 KN/m2
Loading capacity: (Excerpt from DIN EN 1991-1)
T1 Residential buildings, office buildings qk 3.00 kN/m2 Q = 2.0 kN
T2 Allocation between T1 & T3 qk 5.00 kN/m2 Q = 2.0 kN
T3 Staircases from platforms serving qk 7.50 kN/m2 Q = 3.0 kN
as escape route
On staircase systems susceptible to vibrations, the verification of fatigue strength is provided.
For steel railings, we are able to implement many different design requests.
- Bar railings
- Solid railings, filled with wood, glass, expanded metal, perforated plate, or similar
- Industrial railings
- Other customised railings
Railing heights depend on the use of the staircase or the type of building, and on the fall height.
Our railings are built according to these standards:
ITM (Inspection de Travail et des Mines / Luxembourg)
DIN EN ISO 14122-3
DIN EN 1991-1
The handrails are generally designed by us in such a manner that they are, according to the set of rules, conducted continuously over the entire course of the staircase without interruption.
Corrosion protection on stairs and railings
The implementation of staircases as indoor or outdoor steps places different demands on materials, construction and coatings. As outdoor staircases are exposed to weather conditions, corrosion protection plays an important role. Next to the constructive weather protection by a careful detail development, the surface protection must also be provided. In order to ensure that the steps can also be used safely in event of rainfall, we pay attention that anti-slip surfaces or permeable coatings such as, e.g., gratings are used.
MIG processes stainless steel and steel:
Stainless steel has a bright glimmering surface. Its corrosion resistance, robustness and insensitivity against damage, its high strength and its easy formability mean a cost-effective and durable solution. The surfaces of the railings can be supplied in standards versions 2B mat surfaces
(glass bead blasting) or as a polished version.
We generally use stainless steel types 1.4301 (X5CrNi18-10) for building railings and staircases.
The possibilities of corrosion protection with steel are versatile.
Metallic zinc coatings can be applied to steel parts (staircases, railings) in different manners.
Hot-dip galvanising: The steel parts are alloyed on the surface by immersing in a bath filled with molten zinc and covered with zinc. Zinc coatings are hard, abrasion resistant and corrosion resistant over decades. The minimum layer thickness of the zinc coating is defined in the standard DIN EN ISO 1461 depending on the material thickness.
Thin sheet metal, pipes made from thin-walled material cannot be hot-dip galvanised for tensioning and warping reasons.
Zinc spraying: With zinc spraying, the zinc is sprayed onto the surface of the steel part according to DIN EN ISO 2063. The layer thickness of zinc spray coatings is usually between 80 and 150 µm. The spray zinc is used on steel parts that cannot be galvanised in pieces due to their design.
Coatings can be applied to the zinc surface. This is carried out according to different methods (liquid, powder coatings).
Duplex coating according to DIN EN ISO 12944-5 is a corrosion protection system that comprises a galvanising in combination with one or several successive coatings.
The choice of the protective system depends on the corrosive loading of the location of the steel construction.
The corrosivity categories are categorised as C1 – C5-M depending on the corrosive loading.
DIN EN ISO 12944-1 Protection duration
DIN EN ISO 12944-2 Corrosive loading
DIN EN ISO 12944-3 Design for protection against corrosion
DIN EN ISO 12944-4/5 Surface preparation
DIN EN ISO 12944-6 Coating materials / systems
DIN EN ISO 12944-7 Implementation and monitoring of coating work
We would be pleased to advise you on the different coating systems.
Balconies can comprise a bearing steel frame with a floor covering with water carrying layer. The railings are fixed to the frame. The balcony base stands on steel pillars or on steel wall supports.
- Cost effective thanks to the use of commercially available steel profiles
- Large support-free spans up to 6.00 m
- Floor covering according to individual desires (wood, concrete stone, natural stone, grating, etc.)
- Balcony canopies can also be implemented as steel constructions cost-effectively just as individually
- Turnkey from one source
Material and corrosion protection, see under Staircases and railings
The planning and statical calculation are carried out with great care by MIG in every detail.
We would be pleased to advise you in your individual requirements and desires for special constructions, such as:
- Canopy constructions
- Steel furniture for indoors and outdoors
- Wooden shelves for chimneys
- Rubbish bin enclosures
- Stainless steel pools
- Terraces, garden fountains, water bowls made from Corten steel, stainless steel according to your own design
- Lawn edges made from hot-dip galvanised steel, Corten steel, stainless steel