building construction Paper 3 WASSCE (SC), 2017

Question 1

 


FOUNDATION:  675 x 225 concrete strip foundation laid to a depth of 900 below  ground level.
FLOOR:  Earth filling.
                Hardcore 300.
                 Concrete slab 150.
                 Mortar screed 25.
FIRST FLOOR: Concrete slab 150.
                         Mortar screed 25.  
WALLS:  All walls are 225 sandcrete hollow blocks walls.

BEAMS/LINTELS
   AND COLUMNS: 225 x 225 reinforced concrete.

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

WINDOWS: All windows are glazed aluminium sliding type.
W1 – 1800 x 1200  (3-bays).
W2 –  1200 x 1200 (2-bays).
W3 – 1200 x 600  (2-bays). W4 – 600x 600     (2-bays).

WARDROBE:  Built with plywood and 50 x 50 hardwood timber frames.  
                         Cloth compartment     -  2100 x 600 x 2000              
Box   compartment     - 2100 x 600 x 525
THRESHOLD STEPS: Width –   1200.                      
Tread   –   300
Rise     –   150.
ROOF: Double pitched timber roof with long span aluminium roofing sheets.
Eaves projection          –          750
Pitch                            -           20º
Height from ground floor to ceiling – 3000
Height from first floor to ceiling      - 2700

 

 

Draw to a scale of 1:50,  the detailed section X – X of the building from the foundation to roof.
A good number of candidates succeeded in:
-           using appropriate conventional symbols to represent the key elements of the solid ground floor construction;
-           showing the walls in section withg rendering/plastering on both internal and external sides.
-           identifying the timber members correctly.

Observation

 

However, it was observed on their drawings:
-           failure to show the strip foundations in the correct proportion to the thickness of the substructural walls;
-           in ability to position the doors and windows correctly, to conform with what is on the floor plan;
-           failure to show the mortar screed finish specified for the concrete floor slab.
.           walls in sections were not hatched;
The expected response to  question 1 is as given below: