Observation

Majority of the candidates were able to:

• list five walling materials for a domestic building

• state one advantage  each for the use of the following:           

• metal window frames;
• timber window frames.

However, few of them failed to identify the parts labelled M, N, O, P, Q and R correctly.
The expected response to question 3 is as given below:
3 (a)     List five walling materials for a domestic building:

• sandcrete block;
• concrete;
• clay brick;
• timber;
• glass;
• metal;
• stones;
• adobe blocks;
• lateritic blocks;
• bamboo;
• plastic.

                             
(b)       State one advantage each for the use of the following:
(i)   Metal window frames
-     more resistant to weather elements;
-     does not shrink;
-     not affected by dry rot and decay;
-     not attacked by insects;
-     does not spread fire;
-     it is more durable;
-     does not twist or warp;
-     does not absorb moisture. 

(ii) Timber  window frames 
-     ease to work with;
-     does not corrode;
-     can withstand fire if treated;
-     it is not affected by thermal movement;
-     does not transfer heat;
-     can be formed to any shape.      

                                                                                                  
(c)        Identification of labelled parts M,N,O,P,Q and R;