building construction Paper 3 WASSCE (SC), 2017

Question 1

 

SPECIFICATIONS


FOUNDATION:                   675 x 225 concrete strip foundation laid to a depth of 900
below the ground level.

FLOOR:                       

Earth filling.
Hardcore 300.

    Concrete slab 150.
Cement sand screed 25.

WALLS:                             All walls are 225 sandcrete hollow blocks walls.
BEAMS/LINTELS
 AND COLUMNS:             225 x 225 reinforced concrete.
ARCHES:                          All arches are semi-circular reinforced concrete type.
Arch 1:           

Height – 2500.
Span –   2600.
Arch 2:          

Height – 2500.
Span –   2400.

DOORS:                           D1 – 1200 x 2100 glazed aluminium door.                
D2 – 900 x 2100 panelled wooden door with 100 x 50 hardwood timber frame.
D3 – 750 x 2100 panelled wooden door with 100 x 50 hardwood timber frame.

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

WARDROBE:                1575 X 600 X 3000.  
Cloth compartment     - 1575 x 940  

Box   compartment     -1575 x 1935 

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

ROOF:                       Double pitched timber roof with long span aluminium roofing sheets.
Eaves projection          –          750
Pitch                            -           15º
Height from ground floor to ceiling – 3000.


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

 

Observation

 

A good number of candidates did well by showing:
-           the  substructural elements ( i.e earth filling, hardcore filling, concrete floor slab and mortar screed finish ) with conventional symbols;
-           in details, the timber roof truss members and labelling the key parts.

Hower, it was observed that the:
-           foundation concrete strips were drawn out of proportion;
-           substructural walls were shown to cut through the floor;
-           wardrobe and semi-circular arch were missing on most of their drawings
.           walls in sections were not hatched;
-           doors and windows were the incorect type in most cases.  

The expected response to  question 1 is as given below: