Photo AI
3.1 Differentiate, by means of a labelled freehand drawing, between a tread and rise of a staircase - NSC Civil Technology Construction - Question 3 - 2023 - Paper 1
Question 3
3.1 Differentiate, by means of a labelled freehand drawing, between a tread and rise of a staircase. 3.2 Name TWO types of roof trusses that do NOT use tie beams. ... show full transcript
Worked Solution & Example Answer:3.1 Differentiate, by means of a labelled freehand drawing, between a tread and rise of a staircase - NSC Civil Technology Construction - Question 3 - 2023 - Paper 1
Step 1
Differentiate, by means of a labelled freehand drawing, between a tread and rise of a staircase.
Answer
A tread is the horizontal part of a stair where one steps, while a rise is the vertical component that connects one tread to the next. In the labelled drawing:
- A labelled line indicating the tread width is marked, typically between 25cm to 30cm.
- A labelled rise height is provided, usually from 15cm to 20cm. The drawing should effectively illustrate both components clearly.
Step 2
Name TWO types of roof trusses that do NOT use tie beams.
Answer
- Howe Truss: This type has diagonal members sloping outward from the apex to the supports, allowing for an efficient load distribution without the need for tie beams.
- King Post Truss: This is a simple truss with a central vertical post, providing support without incorporating tie beams.
Step 3
Use ANSWER SHEET 3.3 and complete the sketch to show how a roof truss is joined to a wall by using a hoop iron strap. Print any ONE label.
Answer
In the sketch, draw the roof truss connected to the wall using a hoop iron strap. Label the hoop iron strap itself, clearly showing how it secures the truss to the wall, providing stability and load management.
Step 4
Use ANSWER SHEET 3.4 and differentiate, according to scale 1 : 10, between the ridge construction of a South African (Howe) roof truss and the ridge construction of a closed couple roof truss.
Answer
In the drawing:
- For the South African (Howe) Roof Truss, illustrate the apex with diagonal members descending toward the supports. Note the angle of the ridge and the connection points.
- For the Closed Couple Roof Truss, illustrate a simpler apex where rafters meet directly without outer members. Indicate the ridge line, noting the more compact structure. Both diagrams should be clearly scaled to 1:10, with annotations on key features.