Photo AI
ROOFS, STAIRCASES AND JOINING (SPECIFIC) Start this question on a NEW page - NSC Civil Technology Construction - Question 3 - 2023 - Paper 1
Question 3
ROOFS, STAIRCASES AND JOINING (SPECIFIC) Start this question on a NEW page. 3.1 Differentiate, by means of a labelled freehand drawing, between a tread and rise of... show full transcript
Worked Solution & Example Answer:ROOFS, STAIRCASES AND JOINING (SPECIFIC) Start this question on a NEW page - NSC Civil Technology Construction - Question 3 - 2023 - Paper 1
Step 1
3.1 Differentiate, by means of a labelled freehand drawing, between a tread and rise of a staircase.
Answer
To differentiate between the tread and rise of a staircase, start with a freehand drawing of a staircase. Clearly label the following:
- Tread: This is the horizontal part of the step that you step on, typically measured from the front edge of one step to the front edge of the next.
- Rise: This is the vertical part of the step that connects one tread to the next, measured from the top of one tread to the top of the next.
Make sure your drawing is labelled clearly, showcasing both components in relation to a step.
Step 2
3.2 Name TWO types of roof trusses that do NOT use tie beams.
Answer
Two types of roof trusses that do not utilize tie beams are:
- Collar-tie roof truss: A common type where a horizontal member is used at the upper third of the rafters.
- Couple roof truss: This design doesn’t require a tie beam because of its support structure which comprises only rafters.
Step 3
3.3 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 your sketch, illustrate a roof truss being joined to a wall using a hoop iron strap. Make sure to include the following features:
- Rafter: The sloping beams that support the roof.
- Wall Plate: The horizontal piece that the rafter sits on.
- Hoop Iron Strap: The physical strap that secures the rafter to the wall. Label it as 'Hoop Iron Strap'.
- Ensure proper representation of clout nails securing the wall plate and truss.
Step 4
3.4 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
Begin by sketching both types of ridge constructions to scale 1 : 10.
-
South African (Howe) Roof Truss Ridge: Clearly show the details of the king post and the rafters meeting at the ridge. Label the components such as the ridge beam, rafters and ensure to indicate the slope of the roof accurately. The connection here generally involves a king post.
-
Closed Couple Roof Truss Ridge: In this sketch, illustrate how rafters meet at the peak without a tie beam. Indicate where rafters rest against the ridge beam, and label the components.
-
Make sure the pitch is represented, verifying it maintains the specified 30° angle.