4.1 Identify the tool - NSC Civil Technology Woodworking - Question 4 - 2020 - Paper 1

Without personal safety equipment, users may be at risk of injuries such as:

• Eye injuries from dust and debris.
• Lung damage due to inhaling fine particles of wood dust.
• Body injuries from loose clothing getting caught in the moving parts of the tool.

Storing the hand tool in a safe, dry place prevents damage caused by moisture, rust, or corrosion, and ensures that the tool remains in optimal working condition for future use.

Adjusting the height of the thickness planer while it is in operation can result in several issues, such as:

• Potential damage to the machine.
• The risk of causing injury to the operator.
• Difficulty in maintaining consistent material thickness, as the wood may get stuck.

To maximise the use of the blades in the thickness planer, the following care should be taken:

• Ensure that the blades are properly sharpened and in good condition.
• Make certain that the machine is free from any metal objects before operating.
• Avoid overloading the machine to prevent blade dulling.

4.3.1 Tiled roofs:

• Polypropylene membrane
• Plastic membrane

4.3.2 Thatch roofs:

• Aluminum foil or fireproof material
• Synthetic/plastic membranes

4.3.3 IBR roof sheeting:

• Synthetic underlay
• Waterproofing membrane.

Ensure to accurately represent the inclined roofs with a defined valley at the joint, adhering to the correct dimensions and angles.

One reason to close an open eave is to prevent birds from nesting in the roof space, which can lead to blockages and increased maintenance.

Fibre-cement ceiling board is preferred because it is water-resistant, durable, and less susceptible to moisture-related issues compared to gypsum ceiling board.

4.7.1 Concrete roof tiles:

• Prone to chemical weathering and can lose aesthetic appeal.
• Heavy and may require a stronger structural support.

4.7.2 Thatch roofs:

• Require regular maintenance and re-thatching every few years.
• Highly susceptible to fire unless treated.

4.7.3 Corrugated iron sheeting:

• Can be dangerous due to sharp edges.
• Susceptible to rust if not maintained properly.

The framework of a trapdoor will typically be secured to:

• The tie beam.
• The branding of the roof structure.

Mechanically graded timber provides a more reliable assessment of quality and strength than visual grading, ensuring safer and more durable roof construction.

Timber must be preserved to:

• Prevent decay and extend the lifespan of the timber.
• Protect it against pests and environmental conditions such as moisture.

When drawing the king post roof truss, ensure the scale is applied correctly, including measurements for the walls, tie beam, and span to reflect accurate proportions.