Observation

Most candidates were able to:
           
- sketch a corner profile and label the parts;
-           list four types of block used for wall construction.

However, few of them were unable to state one use of fire brick and facing brick.

b(i)       Uses of firebricks

-     lining of chimney shafts;
-     construction of boilers;

• construction of ovens;
• construction of kilns;
• construction of furnace.  

            (ii)        Uses of facing bricks:

• they are used for facing buildings;
• they are used for constructing load and non-load bearing walls;
• they are used to provide a durable and pleasing finish or aesthetic effects in building;
• they are used as voussoirs in arch construction.

(c)i.      Types of blocks used for wall construction:
According to materials:       

• sandcrete block;
• landcrete block;
• concrete block;
• clay block.

ii.         According to shapes:

• hollow block;
• solid block;
• cellular block.

iii.        According to densities:

• lightweight aggregate block;
• dense aggregate block.