Most candidates were able to:
- state the differences between wood single and clay tile.
- state advantages of wood single over clay tile when used as roof covering material.
However, majority of the candidates were unable to:
- label the parts of a straight flight correctly.
- state stages involved in preparing the surface of a sandcrete blockwall to received a render.
The expected response to question 2 is as given below:
2 (a) Difference between wood single and clay tile
- wood single is a thin slab of wood;
- clay tile is a burnt sheet of clay material.
(b) Advantages of wood single and clay tile:
(1) it is tougher and more durable;
(2) lighter in weight.
(c)
(d) Stages involved in preparing the surface of block wall to receive a render:
- The wall surface should be well keyed;
- Should be cleaned of all loose dirt;
- The wall surfaces should be damped to avoid suction;
- The render should not be of a rich cement and sand mix (to avoid shrinkage and cracking);
- The sand should be of good quality, clean and well graded.
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