Drywall Finisher & Plasterer (Red Seal)

Performs common occupational skills

What setup ratio is correct for a portable straight ladder reaching upper walls during taping?

1. Vertical orientation (1:1) so the climber does not have to lean
2. Base out one unit per four units of working height (4:1)
3. A 2:1 ratio for a steeper, faster climb to the top of the wall
4. Whatever feels stable once three-point contact is in place

The accepted geometry is a 4:1 ratio — the base of the ladder is set out one unit from the wall for every four units of working height (approximately 75°). The ladder must extend at least 1 m (about 3 ft, or three rungs) above the upper landing/support point. A vertical setup tips backward under any weight shift. A 2:1 ratio over-leans the ladder so the feet slide out as the worker climbs. Three-point contact protects climbing posture but does not replace the setup angle that prevents the base from sliding in the first place.

RSOS 2023 | A-2.01 Uses access and lifting equipment

Prepares, tapes and finishes drywall

During pre-taping prep, what action does B-5.01 require for ragged sheet edges at end-to-end joins?

1. Leave it in place because the first coat will lock it down anyway
2. Score the frayed face paper at the butt joint to remove the frays
3. Soak the area with water until the frays soften and lay flat down
4. Cover the joint with mesh tape and skip scoring the frayed paper on site

B-5.01.05P calls for scoring frayed face paper at butt joints so the frays come off cleanly before any compound is applied. Leaving frays in place produces ridges and lifted tape after the first coat dries. Soaking the joint introduces water that destabilises the gypsum core and feeds the very paper edges the finisher is trying to control. Mesh over an uncleaned frayed edge holds the fray underneath the tape, so it telegraphs through the second and third coats and shows under raking light during final inspection.

RSOS 2023 | B-5.01 Prepares drywall surface

Performs repairs and restorations

Which problems does C-8.01 list as the visible drywall failures the finisher must diagnose?

1. Only paint colour drift caused by aging interior light fixtures on the job in the field
2. Mould, screw pops, water damage, cracks, bubbles, holes, fire and smoke damage
3. Furniture impact marks that occur after occupancy by the homeowner
4. Only manufacturer label residue left on the sheet during installation work

C-8.01 names the problem set as mould, screw pops, water damage, cracks, bubbles, blisters, holes, fire damage, smoke damage. Each is a discrete failure mode with its own root cause and repair path. Paint colour drift is a paint defect handled by the painter. Furniture impact damage occurs after the finisher has handed off and is a touch-up scope item or warranty call. Manufacturer label residue is a hanging-stage concern, not a finishing-stage failure mode requiring root-cause assessment under the troubleshooting subtask.

RSOS 2023 | C-8.01 Determines cause of problem