building construction Paper 3 WASSCE (PC), 2017

Question 1

 

SPECIFICATIONS
FOUNDATION:                   675 x 225 concrete strip laid at a depth of 900below the ground level.
FLOOR:                            

 Earth filling.
 Hardcore 300.
Concrete slab 150.
Mortar screed 25.

WALLS:                                All walls are 225 sandcrete hollow blocks.
DOORS:                               D1 – 1200 x 2100 glazed metal door.            
D2 – 900 x 2100 x 40 panel wooden door with 100 x 50 hardwood timber frame.
D3 – 750 x 2100 x 40 flush wooden door with 100 x 50 hardwood timber frame.

BEAMS/LINTELS
   AND COLUMNS:             225 x 225 reinforced concrete.
RAMPS:                                Width –   2100.                      
Run     –   1500
Rise     –   450.

WINDOWS:                          All windows are glazed aluminium sliding type.
W1 – 1800 x 1200  (3-bays).
W2 –  1200 x 1200 (2-bays).
W3 – 900 x 600 (2 – bays).
W3 – 600 x 600  (2-bays).

THRESHOLD STEPS:        Width –   1500.                      
Tread   –   300
Rise     –   150.

WARDROBES:                    1800 X 600 X 2100.  
Cloth compartment     - 1550 x 600               
Box   compartment     - 550 x 600

ARCHES:                              All arches are semi-circular type.

Arch 1: Span 1388      Height – 2400.
Arch 2: Span 1688      Height – 2400.
Arch 3: Span 1200      Height-  2400.
Arch 4: Span 1500      Height-  2400.            
ROOF:                       Pitched (hipped)  timber roof with long span aluminium roofing sheets.
Eaves projection          –          60
Height from concrete floor slab to ceiling – 3000.

 To a scale of 1:50, draw the detailed section X – X of the building from the foundation to roof.

 

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  • Observation

     

    The candidates did well by:
    -           showing the  ground floor construction details and super-structural walls accurately in section;
    -           graphically representing in section, the timber roof-structure members.
    Hower, good number of them failed to:
    -           draw the concrete strip foundation to scale;
    -           show the wardrobe in elevation;
    -           draw the correct type of door;
    -           show semi-circular arch. 

    The expected response to  question 1 is as given below: