Scaffold supervisor interview questions and answers

1. 100 × 100 mm, 4 mm thick
2. 150 × 150 mm, 6 mm thick
3. 200 × 200 mm, 8 mm thick
4. 150 × 150 mm, 3 mm thick

Answer: 150 × 150 mm, 6 mm thick. Base plate at least 150 × 150 mm and 6 mm thick under every post, on a timber sill at least 225 mm wide and 38 mm thick. CSM II-2 §2.5.2. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor I exam.

1. Green until the next inspection
2. Yellow: harness users only
3. Red: no work until a new signed tag
4. Green if the supervisor says so

Answer: Red: no work until a new signed tag. An expired tag counts as red: no work until a new signed tag is in place. GI 8.001 (2025) §9. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor I exam.

1. Half the threaded length
2. Two thirds of the threaded length
3. The full thread
4. As far as the base plate allows

Answer: Two thirds of the threaded length. Maximum screwjack extension is 2/3 of the threaded length. Level with the jack, never with bricks or packing. CSM II-2 §2.5.2. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor II-T exam.

1. 150 mm wide × 25 mm thick
2. 200 mm wide × 32 mm thick
3. 225 mm wide × 38 mm thick
4. 300 mm wide × 50 mm thick

Answer: 225 mm wide × 38 mm thick. Timber sill at least 225 mm wide and 38 mm thick, under at least 2 posts, on sound, compacted, level ground. CSM II-2 §2.5.2. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor II-S exam.

1. 30 km/h
2. 37 km/h
3. 40 km/h
4. 50 km/h

Answer: 40 km/h. Stop erection at 37 km/h; stop all use at 40 km/h and re-inspect before restart. CSM II-2 Table 2.3. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor II-S exam.

1. 0.5 m
2. 1 m
3. 1.5 m
4. 2 m

Answer: 1 m. Ladder top at least 1 m above the landing, set at 4 : 1 and tied off at the uppermost support. CSM II-3 §3.4. Verify against the latest edition.

From the free Saudi Aramco Scaffold Supervisor II-T exam.

1. 2.40 m board measuring 2.42 m
2. 3.00 m board measuring 2.97 m
3. 3.90 m board measuring 3.88 m
4. 4.20 m board measuring 4.16 m

Answer: 3.00 m board measuring 2.97 m. Length tolerance is ± 25 mm, or ± 50 mm for boards longer than 3.9 m. The 3.00 m board is 30 mm short, outside ± 25 mm. The 4.20 m board is 40 mm short but within ± 50 mm; the 3.90 m (−20 mm) and 2.40 m (+20 mm) boards are within ± 25 mm. BS 2482:2009 5. Verify against the latest edition.

From the free Scaffold Supervisor (BS EN 12811-1 and TG20) exam.

1. Ladder jack scaffold: one 2×12 plank, 11-1/4 in wide
2. Pump jack scaffold: two 2×8 planks, 7-1/4 in each
3. Frame scaffold: two fabricated planks, 8 in each
4. Top plate bracket scaffold: one 2×10 plank, 9-1/4 in wide

Answer: Pump jack scaffold: two 2×8 planks, 7-1/4 in each. The general minimum is 18 in; ladder jack, top plate bracket and pump jack scaffolds may be 12 in. Pump jack: 2 × 7.25 = 14.5 in ≥ 12 in. The ladder jack (11.25 in) and top plate bracket (9.25 in) platforms are under 12 in; the frame scaffold's 16 in is under 18 in. Nominal lumber sizes overstate actual widths. 29 CFR 1926.451(b)(2), (b)(2)(i). Verify against the latest edition.

From the free US Scaffold Supervisor (OSHA 1926) exam.

A strong answer covers:

• No erection starts without the permit, however long the queue.
• Use the wait: toolbox talk, material check against the drawing, barricades and exclusion zone ready.
• Chase the permit issuer and tell your superintendent the time you are losing.
• Write the delay in the daily report with the start and end time.

Tip: The written delay record is what later supports a standby or extension claim.

A strong answer covers:

• Stop at a safe stage: no loose boards or tubes left at height, everything tied in or lowered.
• Tag it as not for use and barricade it.
• Follow the site wind limits (for example, on Saudi Aramco sites erection stops at a lower speed than use does).
• Inspect again before anyone goes back up.

A strong answer covers:

• Stop the work and make the edge safe first.
• Only scaffolders, under a competent person, alter a scaffold; the tag status changes until it is inspected again.
• Report it and brief the user's supervisor.
• Fix the cause: plan a loading point or a gate so nobody needs to remove a rail.

A strong answer covers:

• No. An incomplete scaffold is not handed over and never improvised.
• If part of it is complete and safe, hand over only that part, tagged, with the rest closed off.
• Order the shortage the same day and record it.

A strong answer covers:

• Scope and drawing, quantities in m³, m² or lm, and the output you expect per productive scaffolder.
• Material on site checked against the list; lifting needs; access route.
• Permits and hold points: who inspects and signs before handover.
• In heat, heavy lifting early, water and rest breaks built into the plan.

Tip: Give a number. "Six men, one chargehand, about 22 m³ by the end of the shift" sounds like someone who has done it.

A strong answer covers:

• Short sentences and the site words everyone knows.
• Show it on the scaffold, do not only say it.
• Ask one person from each group to repeat the key point back.
• Use a bilingual chargehand and pictures for the rule of the day.

A strong answer covers:

• What was missing and why it mattered.
• Who pushed back and how you explained it.
• How fast you closed it and what you changed afterwards.

A strong answer covers:

• Show the numbers: crew, output, hours.
• Offer real options: more men, a second shift, a staged handover.
• Never trade away a check or a tie to win time.

A strong answer covers:

• Foundation, plumb, bracing and ties against the design.
• Full boarding, guardrails, toe boards and access.
• Load class matches the job; the tag shows the right status and date.