Orientation to the Painting Trade, Safety, and Trade Math
Domain 1 covers how the painting trade is organized, the safety rules that govern every task, and the arithmetic that turns a tape measure into a materials list.
Safety rules the exam expects
- OSHA 29 CFR 1926 governs construction painting; fall protection is required at 6 ft, and ladders follow the 4:1 rule and extend 3 ft above the landing.
- Read the SDS before opening a product; ventilate and wear the respirator cartridge the SDS specifies.
- Assume lead on pre-1978 housing; dry sanding and heat guns are prohibited under the EPA RRP rule.
Trade math to do cold
- Wall area = perimeter x height minus openings; paint = total area including coats divided by coverage, rounded up to whole containers.
- Typical coverage on smooth sealed drywall is about 350 sq ft per gallon.
Worked example: a 12 x 14 ft room with an 8 ft ceiling, two coats, one 3 x 7 ft door and two 3 x 5 ft windows. Perimeter = 2(12+14) = 52 ft; walls = 52 x 8 = 416 sq ft; openings = 21 + 30 = 51; net walls = 365 sq ft; ceiling = 168 sq ft; total = 533 sq ft; two coats = 1,066 sq ft; 1,066 / 350 = 3.05, so buy 4 gallons. The reasoning: subtract openings before multiplying by coats, and always round up.
Traps
- Forgetting the ceiling or the second coat.
- Using 400 sq ft per gallon because it sounds standard when the label says 350.
- Mixing inches and feet in the same calculation.