Staircase - Introduction, Types, Parts and Design

In this slides, I have given an introduction to staircase and discussed, the types, parts and design of staircase.

1. Rohan Dasgupta
Staircase

2. 1800 mm1650 mm
Staircaseisaconstructiondesignedtobridgealargeverticaldistancebydividingitinto
smallerverticaldistances,calledsteps.

3. TypesofStaircase:1.STRAIGHTSTAIRCASE
The straight staircase is the simplest staircase design.
There are two types:
1.Straight
2.Straight with landing
They’re the easiest type of stairs to ascend and descend
as well as build.
They’re quite plain and don’t offer a grand design.
With respect to footprint, it falls in the middle as to how
much footprint it takes up in the home.

4. TypesofStaircase:2.QUARTERTURNSTAIRCASE
Thequarter-turnstaircaseisonewhereitturns90°
atsomepoint.
The“quarter”referstothedegreeofturn.
Thistypeofstaircaseisgreatforcertaintypesof
homelayoutssuchasonewithafoyerwherethe
doorisinfromthewallsufficientenoughtofitin
partofthestairs.
It’smoreinterestingindesignthanastraight
designandtheturnmeanstherewillalmost
alwaysbeasmalllandingpartwayup.

5. TypesofStaircase:3.HALFTURNSTAIRCASEorDOGLEGGEDSTAIRCASE
Thequarter-turnstaircaseisonewhereitturns
180°atthemid-landing.
The“half”referstothedegreeofturn.
This is a very popular design because it’s a decent
space-saver by doubling up.
It’s also a fairly simple style to build.
The downside to this is it’s not all that grand of a
staircase.

6. TypesofStaircase:4.THREEQUARTERTURNSTAIRCASE
Thequarter-turnstaircaseisonewhereitturns90°
ateachofits3landings.
The“threequarter”referstothedegreeofturn.
It is an elaborate design.
Quite a bit of space is required to build such a
design.
It is usually in homes with above-average ceiling
height.

7. TypesofStaircase:5.CIRCULARSTAIRCASE
-topviewiscircularinshape.
-usedfortallerceilings.

8. TypesofStaircase:6.SPIRALSTAIRCASE
-stepsareattachedradiallytoacentralpole
-usuallymadeofmetal
-usedpredominantlywhereverticalheighttobe
coveredismuchmorecomparedtothe
horizontalspaceavailable.
-foreg.inwatchtowers,storagesilos,water
tanksetc.
-noteasytoascendordescend.

9. TypesofStaircase:7.BIFURCATEDSTAIRCASE
-centralstraightstairgetsbifurcatedtotwo
straightstairsat90°atthemid-landingin
oppositedirections
-takesupthemostspace
-luxuriousstaircase;usedmostlyforgrand
entrances

10. Staircaseisaconstructiondesignedtobridgealargeverticaldistancebydividingitinto
smallerverticaldistances,calledsteps.

11. PartsofStaircase:

12. Bye-Laws for Staircase:
-Minimum tread = 300 mm
-Maximum riser = 150 mm
-Maximum number of risers per flight = 12
-Minimum headroom = 2.2 m
-Minimum width of one stair = 1.5 m
-Minimum width of mid-landing >= width of one stair
Ref: Clauses 12.4.1. and 12.4.2. of NBC of India 2016 (Vol. 1, Part 3) pg. 44

13. Q.Designanddrawadog-leggedstaircaseforafloortofloorheightof3.6m.
Floor to floor height = 3600 mm
∴floor to mid-landing height = 3600/2 mm = 1800 mm
Assume height of one riser = 150 mm
∴total number of risers in one flight of stair = 1800/150 mm = 12
(<= 12; therefore okay)
∴totalnumberoftreadsinoneflightofstair=(12-1)=11
Assumewidthofonetread=300mm
Assumewidthofonestair=1500mm
Assumewidthofmid-landing=1500mm

14. Q.Designanddrawadog-leggedstaircaseforafloortofloorheightof3.0m.
Floor to floor height = 3000 mm
∴floor to mid-landing height = 3000/2 mm = 1500 mm
Assume height of one riser = 150 mm
∴total number of risers in one flight of stair = 1500/150 mm = 10
(<= 12; therefore okay)
∴totalnumberoftreadsinoneflightofstair=(10-1)=9
Assumewidthofonetread=300mm
Assumewidthofonestair=1500mm
Assumewidthofmid-landing=1500mm

15. Thank you
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