Keep an eye on the parameter control bar above the staircase diagram; if the values are green, the staircase is comfortable. In special situations, use the recommendations provided by our system to make decisions.
Headroom mm
Value >=  mm
Run mm
Value >=  - mm
Rise mm
Value >=  - mm
Effective width mm
Value >=  mm
Stair formula mm
Value >=  - mm

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I-shape

stair

I-shaped or straight stairs
Compared to L shaped and U-shaped stairs, I-shaped stairs are the most affordable staircase solution. Also, the work related to measuring and installing I-shaped stairs is simpler and the risks are lower and can be performed even by a moderately experienced builder. I-shaped stairs are an important element of interior design, giving the opportunity to achieve a simple and minimalist style or by placing space in the middle to dominate the interior design.

If the choice is in favor of an I-shaped staircase, the need for more space must be taken into account at the expense of interior space. Compared to alternative staircases, longer I-shaped stairs require more consideration of the safety of the stairs and the safety risks associated with the use of the stairs.
When choosing the shape of the stairs, it is definitely worth consulting an architect, interior designer or STAIR24 specialists to find the most suitable solution.

Direction of stairs

Features

Stringer

Stringers of the Staircase

The stringers of the staircase are the main supporting structure of the staircase, on which the treads rest. Stringers can be traditional with a linear edge shape, in which case they are called classic type stringers, or with a stepped edge shape, in which case they are referred to as modern type stringers. For unfinished, lacquered, oiled, or stained stairs, the stringer material is laminated wood made from a wood species chosen by the customer. For painted stairs, the stringer material can be either laminated wood or laminated wood covered with HDF material.

Classic Type Stringers

In the case of classic type stringers, the treads are fixed between the stringers, into mortises processed into the sides. The joint between the tread and the stringer is made with a screw connection. Before installing the treads, the mortises are treated, which, in addition to strengthening the staircase construction, helps prevent creaking sounds caused by the movement of staircase components.

Modern Type Stringers

In the case of modern type stringers, the treads are supported by dowel joints on the horizontally processed upper edges of the stringers. For modern staircase stringers, the term “saddle stringer” is sometimes also used.

Riser

In the case of open staircases, the space between the treads is open or partially closed with a safety strip for security reasons. The safety strip can be chosen as an optional accessory. Safety strips are attached under the treads with screws. An open staircase is more affordable than a closed staircase and also allows better light distribution in the room. In many countries, the maximum gap between the treads is regulated.

An important structural component of closed staircases are risers installed between the treads. Risers are typically finished in the same tone as the stringers and posts. If a covering paint is chosen for the risers, they are made from MDF board. However, if the risers are to be finished with lacquer, stain, oil, or left unfinished, they are made from laminated wood of the same species and quality grade as the treads. A closed staircase is structurally more rigid and capable of bearing a greater load than an open staircase. Additionally, a closed staircase can be used to create space divisions within a building if needed.

Open step

Handrail and railing position

The placement of stair handrails should be optimal for the comfort and safety of users. It is essential to consider the mobility of the staircase users and the national construction regulations in the specific country. It is important to decide whether the staircase needs one or two handrails and how to secure the handrails. As a standard, the handrail on the inner curve of the staircase is attached with balusters fixed to the stringer. The handrail on the outer curve is generally attached to the wall with handrail brackets. If the staircase is situated between walls, it can either be without handrails or have handrails attached to one or both sides with brackets. The height of the handrails is measured from the front edge of the tread to the top line of the handrail. The standard height for handrails at Stair24 is 900 mm.

Handrail profile

Handrail profile

In the selection, you will find handrails with a square profile (Light), a curved top edge (Light R), and an omega profile (Classic). Stair handrails are generally made from the same material as the treads and use a similar finish.

No handrail

Post profile

Post profile

In the selection, you will find posts with different end profiles: minimalist Light 4 and Light 8, pyramid-topped Central, and specially processed Design and Modern. Stair posts are typically finished in the same tone as the stringers and balusters.

No post

Baluster profile

Baluster profile

In the selection, you will find baluster profiles such as square profile Modern, stainless steel round profile Steel round, and wooden round profile Wood round. Stair balusters are typically made from the same material as the stringers and posts, and they use a similar finish.

 

Modern

Steel round 20

Wood round 22

No post


Materials and finishing

Treads, Handrails

When choosing materials for the steps and handrails, it’s important to consider their durability, ease of maintenance, and suitability for the interior style. Stair steps and handrails are typically manufactured from the same material and use a similar finish.

Wood

Wood

Oak

Undoubtedly the most valuable wood species growing in the Northern Hemisphere. A very suitable material for products that require a decorative appearance and high mechanical strength. The natural tonality of the wood varies from gray-brown to dark brown.

Wood

Ash

Like oak wood, belongs to the list of exclusive joinery wood. With an outstanding texture, the natural tonality of the wood can vary significantly (from white to dark brown).

Wood

Beech

Joiner's wood with good mechanical strength, moderate price with a pink shade and little texture. In the case of stairs, a good choice for a product with an affordable price and resistant to mechanical impact

Wood

Pine

Widely used construction and joiner’s wood in the Nordic countries. With a beautiful texture, but significantly changing tone under the influence of UV radiation. Affordable staircase material. Susceptible to mechanical impact (it is recommended to avoid the use of outdoor footwear on stairs, as well as a significant risk of nail marks in the case of pets).

Finishing

Finishing

Without finishing

Finishing

Lacquer

Finishing

White stain 008-S + Lacquer

Finishing

White stain 010-S + Lacquer

Finishing

Brown stain 018 + Lacquer

Finishing

Brown stain 2755-S + Lacquer

Finishing

Black stain 888-S + Lacquer

Finishing

White paint RAL 9010

Wood range

Wood range

Premium

Laminated wood without finger joints: it is selected material with uniform color, where the more visible side is class A, and the other side is class B.

Knot-free laminated wood without finger joints.

Laminated wood without finger joints: it is selected material with a uniform color, where the more visible side is class A, and the other side is class B.

Wood range

Natural

Knot-free laminated wood without finger joints.

Wood range

Smart

Finger-jointed lamella, made from selected material with uniform color, where the more visible side is class A, and the other side is class B.

Knot-free laminated wood without finger joints.

Finger-jointed lamella, using selected material with uniform color, where the more visible side is grade A, and the other side is grade B.

Finger-jointed laminated wood with small knots.

Wood range

Economy

Finger-jointed lamella, with knots present, including both light and dark wood in the same piece, where the more visible side is grade B, and the other side is grade C.

Finger-jointed lamella with knots, including both light and dark wood in the same piece, where the more visible side is grade B, and the other side is grade C.

Finger-jointed lamella with knots.

Stringers, posts, balusters, risers

Stair stringers, posts, wooden balusters, and risers are typically finished similarly. When using transparent finishing materials such as varnishes, stains, or oils, laminated wood made from the same wood species is used for manufacturing these stair components. Stainless steel is also an option for choosing stair balusters.

Wood

Wood

Oak

Undoubtedly the most valuable wood species growing in the Northern Hemisphere. A very suitable material for products that require a decorative appearance and high mechanical strength. The natural tonality of the wood varies from gray-brown to dark brown.

Wood

Ash

Like oak wood, belongs to the list of exclusive joinery wood. With an outstanding texture, the natural tonality of the wood can vary significantly (from white to dark brown).

Wood

Beech

Joiner's wood with good mechanical strength, moderate price with a pink shade and little texture. In the case of stairs, a good choice for a product with an affordable price and resistant to mechanical impact

Wood

Pine

Widely used construction and joiner’s wood in the Nordic countries. With a beautiful texture, but significantly changing tone under the influence of UV radiation. Affordable staircase material. Susceptible to mechanical impact (it is recommended to avoid the use of outdoor footwear on stairs, as well as a significant risk of nail marks in the case of pets).

Finishing

Finishing

Without finishing

Finishing

Lacquer

Finishing

White stain 008-S + Lacquer

Finishing

White stain 010-S + Lacquer

Finishing

Brown stain 018 + Lacquer

Finishing

Brown stain 2755-S + Lacquer

Finishing

Black stain 888-S + Lacquer

Finishing

White paint RAL 9010

Finishing

Black paint RAL 9005

Wood range

Wood range

Premium

Laminated wood without finger joints: it is selected material with a uniform color, where the more visible side is class A, and the other side is class B.

Knot-free laminated wood without finger joints.

Laminated wood without finger joints: it is selected material with a uniform color, where the more visible side is class A, and the other side is class B.

Wood range

Natural

Knot-free laminated wood without finger joints.

Wood range

Smart

Finger-jointed lamella, made from selected material with uniform color, where the more visible side is class A, and the other side is class B.

Finger-jointed knot-free lamella.

Finger-jointed lamella, made from selected material with uniform color, where the more visible side is class A, and the other side is class B.

Finger-jointed lamella with small knots.

Wood range

Economy

Finger-jointed lamella with knots, including both light and dark wood in the same piece, where the more visible side is grade B, and the other side is grade C.

Finger-jointed lamella with knots, featuring both light and dark wood markings within the same details, where the more visible side is grade B, and the other side is grade C.

Finger-jointed lamella with knots.

Wellhole shape

UP

Stairwell refers to the opening inside the ceiling structure where the stairs are positioned, forming the staircase. A well-functioning staircase with sufficient headroom requires an optimally sized stairwell. It is advisable to finalize the choice of staircase model, layout, and dimensions during the building design phase. Stairwells are typically either rectangular or L-shaped.

Well hole sizes

Well hole height measurements

Ceiling thickness C

Floor to floor height H

2700 mm H = 300 mm C =
Change the value
mm
Gap: - mm
*Standard:
mm
Change the value
mm
Gap: - mm
*Standard:
mm

Well hole opening measurements

Opening side W1

Opening side W2

UP 3264 mm W2 = 1203 mm W1 =
Change the value
mm
Gap -mm
*Standard:
mm
Change the value
mm
Gap -mm
*Standard:
mm

Walking line from down to top

Stair parameters

Stair measurements

Stair length SL1

Stair width SW1

UP