learn about staircase

1. PARTS and TYPES
Reporters:
Subject Instructor:
OF STAIR
Cristine Jean Intia
Christian Jasa
Mr. Cassius Nitoral
BSIT DRAFTING TECHNOLOGY - 3D

2. Staircase is a construction designed to bridge
a large vertical distance by dividing it into
smaller vertical distances, called steps.

3. Types of Staircase: 1. STRAIGHT STAIRCASE
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. Types of Staircase: 2. QUARTER TURN STAIRCASE
The quarter-turn staircase is one where it turns 90° at some point.
The "quarter" refers to the degree of turn.
This type of staircase is great for certain types of home layouts such as one with a
foyer where the door is in from the wall sufficient enough to fit in part of the
stairs.
It's more interesting in design than a straight design and the turn means there will
almost always be a small landing part way up.

5. Types of Staircase: 3. HALF TURN STAIRCASE or DOG LEGGED STAIRCASE
The quarter-turn staircase is one where it turns 180° at the mid-landing.
The "half” refers to the degree of turn.
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. Types of Staircase: 4. THREE QUARTER TURN STAIRCASE
The quarter-turn staircase is one where it turns 90° at each of its 3 landings.
The "three quarter" refers to the degree of turn.
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. Types of Staircase: 5. CIRCULAR STAIRCASE
- top view is circular in shape.
- used for taller ceilings.

8. Types of Staircase: 6. SPIRAL STAIRCASE
- steps are attached radially to a central pole
- usually made of metal
- used predominantly where vertical height to be
covered is much more compared to the horizontal space available.
- for eg. in watch towers, storage silos, water
tanks etc.
- not easy to ascend or descend.

9. Types of Staircase: 7. BIFURCATED STAIRCASE
- central straight stair gets bifurcated to two straight stairs at 90° at the
mid-landing in opposite directions
- takes up the most space
- luxurious staircase; used mostly for grand
entrances

10. Staircase is a construction designed to bridge a large vertical distance
by dividing it into smaller vertical distances, called steps.

11. Parts of staircase

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

13. Q. Design and draw a dog-legged staircase for a floor to floor height of 3.6 m.
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
total number of treads in one flight of stair = (12-1) – 11
Assume width of one tread = 300 mm
Assume width of one stair = 1500 mm
Assume width of mid-landing = 1500 mm
(<= 12; therefore okay)

14. Q. Design and draw a dog-legged staircase for a floor to floor height of 3.0 m.
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
. total number of treads in one flight of stair = (10 - 1) = 9
Assume width of one tread = 300 mm
Assume width of one stair = 1500 mm
Assume width of mid-landing = 1500 mm
(<= 12; therefore okay)

15. Thankyou
-CristineJeanIntia
-ChristianJasa