Equipment, Safety, and Scheduling
Equipment, safety, and scheduling tests whether you can choose and maintain equipment, control hazards, and build a schedule that dries and reopens on time. Expect questions on production rates, drying, electrical safety, chemical handling, and sequencing.
Equipment
- Vacuums: CRI Seal of Approval models, HEPA filtration for indoor air quality, wide-area vacuums for open floors, and uprights for detail work.
- Extractors: portable versus truck-mount; check solution and recovery tanks, filters, and pressure before each job.
- Rotary, cylindrical brush, and bonnet machines for agitation and interim cleaning; air movers and dehumidifiers for drying; moisture meters and pH strips for verification.
Safety
Keep safety data sheets on site; wear gloves, eye protection, and slip-resistant footwear; use GFCI protection on wet circuits; manage cords and hoses; post wet-floor signs; ventilate; never mix chemicals; label secondary containers; and lift with the legs.
Scheduling
Estimate with production rates, not guesses. Sequence work from least soiled to most, or clean to dirty within a zone, and leave drying time. Typical drying is 2–6 hours depending on method, airflow, and humidity.
Worked example
A 12,000 sq ft retail store closes at 9 p.m. and opens at 8 a.m. Hot-water extraction runs at 500 sq ft/hr per technician. Two technicians equal 1,000 sq ft/hr, so 12,000 ÷ 1,000 = 12 hours, which does not fit the 11-hour window. Options: split over two nights, add a third technician for 1,500 sq ft/hr and about 8 hours plus setup and drying, or use encapsulation on the open sales floor and restore back rooms. Reasoning: schedule the real constraint, not the ideal.
Traps
Ignoring setup and teardown; having no drying plan; overloading circuits; leaving hoses across aisles; working without SDS; and promising a reopen time without a moisture check.