Question 4
a) Sate one measure to be taken in preventing each of the following in a suspended timber ground floor construction: b) List five materials used in the construction of a staircase.
c) State one function of each of the following in door construction.
Observation
Most of the candidates were able to:
- state the use of fire repellents chemicals in preventing fire spread;
- list the materials used in construction of a staircase;
- state the functions of fanlight and transom.
However, the candidates failed to:
- State the measure to be taken in preventing decay of timber and insects attack.
The expected response to question 4 is as given below:
- Measures to be taken in preventing each of the following:
- Fire spread:
- treat the timber members with fire resistance chemical;
- cover timber members with combustible materials;
- sleeper wall should be solid in one direction.
- Decay of timber members:-
- damproof course should be introduced to prevent ground moisture reaching any timber;
- there should be a vent brick/blocks for adequate ventilation;
- treat surfaces of members with water repellent materials/chemicals/oil based.
- Insect attack:-
- should be treated with fungicide/preservatives;
- should be well seasoned.
- Materials used in the construction of staircase:
- timber/wood/bamboo;
- stones;
- concrete;
- metals such as steel bars, alluminium, cast iron, brass, bronze;
- plastics;
- glass.
- One function of each of the following:
- Fanlight -
- to permit borrowed light/allow borrowed light;
- to permit daylight into the room;
- to permit/allow ventilation into the room.
- Transome –
- It is the part that separates the fanlight from the door sash;
- It is he horizontal piece that separates the fixed from the moving parts of the door;
- It is a member across the top of door.