Environmental Considerations Flashcards

At what Beaufort scale wind force should work on a tower scaffold cease?

Answer: Force 4 (moderate breeze, 13-17 mph)

PASMA recommends ceasing work on tower scaffolds at Beaufort Force 4 (moderate breeze, 13-17 mph), when small branches begin to move and dust and paper are raised. Tower scaffolds are lightweight and have large surface areas making them particularly wind-sensitive.

What are the signs of Beaufort Force 4 wind that would trigger stopping work on a tower?

Answer: Small branches move, dust and loose paper are raised, small waves on inland waters

Beaufort Force 4 indicators include: small branches moving, dust and loose paper being raised from the ground, and small waves forming on inland waters. These are observable conditions that operatives can use to judge when to stop work.

How does rain affect the safety of working on a tower scaffold?

Answer: Rain creates slip hazards on platforms and ladders, reduces visibility, and can make components slippery and harder to grip

Rain makes aluminium platforms, ladder rungs, and components slippery, increasing the risk of slips and falls. It reduces visibility, makes tools harder to grip, and can obscure defects during inspection. Work may need to be suspended in heavy rain.

What precautions should be taken when using a tower scaffold in freezing conditions?

Answer: Check for ice on platforms, rungs, and components; apply grit to platforms; ensure operatives wear appropriate clothing and gloves without losing grip

Freezing conditions create ice on platforms, rungs, and handholds, dramatically increasing slip risk. Frost can also weaken components over time. Platforms must be de-iced and gritted. Operatives need warm clothing but must maintain dexterity and grip.

What is the risk of using a tower scaffold in direct strong sunlight?

Answer: Heat exhaustion and dehydration of operatives, thermal expansion of metal components, and glare affecting vision

Strong sunlight can cause heat exhaustion and dehydration (especially at height where there is no shade). Metal components become hot to touch. Glare can impair vision and depth perception. Adequate water, sun protection, and rest breaks must be provided.

What should be done with a tower scaffold if a storm is forecast overnight?

Answer: Dismantle it or reduce it to minimum height, secure all loose items, and consider tying the tower to a fixed structure

If a storm is forecast, the tower should be dismantled if possible, or reduced to minimum height. All loose items (boards, tools, materials) must be removed. If dismantling is not possible, consider tying the tower to a permanent structure and deploying all stabilisers.