Waist Slab Staircase

STAIRCASE
WAIST SLAB STAIRCASE

Design of a Staircase
The following aspects to be identified by
an architect in the staircase drawing in
order to facilitate an Engineer to provide
a structural design to a staircase.
The factors that influence the design of
stairs are
• height of the floor
• width of the stairs
• risers depth
• thread width
• thickness of the stairs
• angle of the stairs,
• load applied on the stairs
Based on these information a qualified
engineer can design the perfect stairs.
Foundation and Support for Concrete Stairs
• The foundation on which the concrete
stairs rest is to be properly
constructed so that the loads of the
stairs are transferred in to ground
successfully and to resist the
movement of stairs.
• If the plinth beam of building is
present at the start of the stairs, then
the reinforcement steels bars can
be connected to them which will
transfer the loads.
• If no plinth beam is found, then a
small concrete foundation or size Bottom Support
stone masonry is constructed.
• To support the stairs at the top which
restricts the movement of stairs is
usually done to the roof beam or Top Support
slab.
Building the Form-work for Concrete Stairs
• The angle of flight, dimensions of
thread and riser are to be properly
checked.
• Usually while constructing a stairs
attached to wall, the line of flight ,
thread and risers are marked on the
wall for proper fixing of shuttering or
formwork.
• The boards must be at least 2” thick,
as to support the weight of the
concrete. The whole structure of the
form, must be supported by 4×4
posts.
• The wooden boards are used to create
the steps and are fastened with
several screws to the lateral structure
of the formwork.
Steel Reinforcement for Concrete Concrete pouring for Stairs De shuttering
Stairs Concrete the ceiling and stairs on the The stairs requires at least 21 days to dry
Cover 25mm same day for better bond. out completely, so the removal of
formwork is to done only after 21days.
Finishing of Concrete Stairs

Once the formwork is removed, the stairs can be finished in many ways as per the
requirement of the use. It can just be finished using trowel or float to give
• concrete finish
• cement tiles
• granite
can be installed for better appearance.
Even carpet or wood can also be used to finish internal stairs.
Plan of the staircase
The following are details of the staircase.
Follow the same.
• Floor to Floor Height: 3000mm

• Landing Height: 1500mm
• Flight Width: 1200mm
• Landing Width: 1500mm
• Thread: 300mm
• Riser: 150mm
• Number of Stairs in each flight 10
• Eye of the stairs: 300mm
DO NOT FOLLOW THE SKETCH FOR

DIMENSIONS
All the information in the drawing has to on

your sheet.
Section of the staircase
• All the adjoining details
to be mentioned in the
drawing.
• Include the grid from the
150mm thick
plan in the section.
• The other flight of the
remaining staircases also
Flight Width: 1200mm to be shown in
Landing Width: 1500mm elevation.
Thread: 300mm
Riser: 150mm
Reinforcement Detail:
• Main Reinforcement: 12mm Dia @ 100mm c/c
• Distribution Reinforcement: 8mm Dia @ 350mm c/c
Landing Detail:
• The Landing Detail is very important for the
waist slab staircase.
• The first picture is incorrect since the
reinforcement is not over lapped.
• Extra bars are added to connect the
landing reinforcement to the waist slab
reinforcement.
• The waist slab reinforcement is tied to the
top reinforcement of the landing. Shown in
red.
• The bottom mat of the landing extends
into the waist slab for extra support.
Shown in blue.
• The extra reinforcement ties the top mat of
the landing to the bottom reinforcement of
the waist slab is shown in Green.
Reinforcement Detail:
• Main Reinforcement: 12mm Dia @ 100mm c/c
• Distribution Reinforcement: 8mm Dia @ 350mm c/c
Landing Beam Detail: Foundation Detail: Concealed Beam at the top of the
• Beam Dimension: 200 x 400mm • Foundation Dimension: 1000 x staircase Detail:
• The top mat of the landing is tied 1000mm. Depth of foundation • Concealed Beam Dimension: 600
to the beam reinforcement in 400mm. x 1200mm. Depth of the beam
Red. • The foundation is at a depth of 150mm.
• The bottom mat of the landing is 1500mm from FFL. • The reinforcement of the waist
tied to the beam reinforcement in • The reinforcement of the waist slab is tied to the concealed
blue. slab is tied to the bottom mat of beam.
the foundation.
Reinforcement Detail: Reinforcement Detail: Reinforcement Detail:

• Main Reinforcement: 6 no of 12mm • The top and bottom mat of the • Main Reinforcement: 10 no of 12mm
Dia foundation is 16mm dia @ 200mm Dia
• Stirrups: 8mm Dia @ 250mm c/c c/c. • Stirrups: 8mm Dia @ 250mm c/c
Nosing Detail
45
36
15
30
Railing Detail
• Design your own detail.
• Drawing to be shown in the
adjoining way.
Railing Detail-
Attached to the wall
• You can try different

materials.
Sheet Composition
Concealed Beam Detail

Scale 1:10
Section showing Railing Detail

reinforcement Landing Beam Detail Scale 1:5
Scale 1:50 Scale 1:10
Foundation Detail
Plan Nosing Detail
Scale 1:10
Scale 1:50 Scale 1:5

Waist Slab Staircase

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STAIRCASE

WAIST SLAB STAIRCASE

Finishing of Concrete Stairs

• Floor to Floor Height: 3000mm

DO NOT FOLLOW THE SKETCH FOR

All the information in the drawing has to on

Reinforcement Detail: Reinforcement Detail: Reinforcement Detail:

• You can try different

Concealed Beam Detail

Section showing Railing Detail

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