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

If no personal safety equipment is worn, several hazardous situations may arise. Dust and debris can cause eye injuries, leading to potential blindness. Additionally, inhaling dust may damage the lungs, causing respiratory problems. Furthermore, loose clothing may become caught in the moving parts of the sander, resulting in severe injuries.

This hand tool should be stored in a safe, dry place to prevent damage from moisture, which can cause rust and decrease its efficiency. Storing it properly also helps avoid accidents and ensures that the tool is ready for use when needed.

Adjusting the height of the table while the thickness planer is operating can lead to several issues. It can cause injury to the operator if hands are near the moving parts. Moreover, it may cause wood to become stuck in the machine or lead to an uneven cut, which can damage the wood and affect the quality of work. Additionally, adjustments made while in operation can result in unnecessary strain on the machine, potentially damaging its internal components.

To maximise the use of the blades, it is crucial to ensure that the blades are regularly sharpened and properly fastened. The machine should also be kept free of any metal objects before operation to prevent damage. Furthermore, operators must ensure that the wood being processed is free of knots and foreign materials that could dull the blades.

4.3.1 Tiled roofs: Polypropylene/Plastic membrane, 4.3.2 Thatch roofs: Aluminium foil or other fireproof material, 4.3.3 IBR roof sheeting: A synthetic/pantile membrane or metal waterproofing membrane.

Note: This answer requires a drawing. Ensure the inclined roofs converge at the valley and that the valley is appropriately represented according to the guidelines provided.

One reason to close an open eave is to provide a more attractive finish to the roof, enhancing the overall aesthetic of the building.

Fibre-cement ceiling board is typically preferred for closed eaves as it offers greater water resistance, preventing potential damage from moisture. Gypsum ceiling board, in contrast, is more susceptible to damp conditions, which could lead to structural issues over time.

4.7.1 Concrete roof tiles:

• They are prone to chemical weathering, which can affect durability.
• Heavier than most other roofing materials, which can require stronger support structures.

4.7.2 Thatch roofs:

• Require regular maintenance and re-thatching every few years.
• Vulnerable to decay as they are organic materials.

4.7.3 Corrugated iron sheeting:

• Sharp edges can be dangerous to handle.
• Prone to rusting if not properly coated or maintained.

Two parts of the roof construction that can secure the trapdoor framework include the tie beam and the branding.

Mechanically graded timber is preferred because it provides a reliable and consistent method of grading that indicates the strength of the wood. It undergoes rigorous testing compared to visual grading, which is subjective. This reliability ensures greater safety and performance in roof structures.

Timber must be preserved to prevent fungal growth and insect damage, which can weaken structural integrity. Additionally, preservation extends the lifespan of timber by protecting it against moisture, heat, and other environmental factors.

This answer requires a drawing of a king post roof truss to the specified scale. Ensure all dimensions are appropriately marked and that the drawing adheres to the criteria provided.