Floor Care Technician cheat sheet

Soil classification drives method: water-soluble (sugars, salts) lifts with aqueous detergent; solvent-soluble (grease, oil, tar) needs a degreaser or solvent; particulate (sand, grit) must be removed dry first so it is not smeared into a slurry.

pH rules: high-pH (10-12) attacks fats and proteins well but can dull finish and damage wool; neutral (6-8) suits finished floors and delicate surfaces; low-pH (2-5) dissolves mineral scale and rust but is corrosive to marble, terrazzo, and aluminum.

Dwell time is a variable, not a suggestion: most detergents need 3-10 minutes of contact to saponify or emulsify; scrubbing immediately after application wastes chemical and labor.

Dilution is measured by ratio, not by eye: 1:64 means 2 oz per gallon (128 oz); 1:128 means 1 oz per gallon; over-concentration leaves sticky residue that re-soils faster than clean floor.

Agitation hierarchy: mop < cylindrical brush < rotary with pad < orbital with pad < high-speed burnish. Match the least aggressive tool that removes the soil to avoid removing the finish.

Water temperature: hot water improves grease cutting and drying speed but can set protein stains and warp wood; 120-140 F is typical for general hard-floor mopping.

Dwell-and-extract for carpet: pre-spray, agitate, then extract with a wand; over-wetting causes wicking and delamination, so pass with dry strokes and keep solution-to-recovery balanced.

Cross-contamination control: color-code mops and buckets by zone (e.g., restroom vs. food area), change solution when it looks soiled, and never return a dirty mop to a clean bucket.

Lighting rule: inspect at a low grazing angle with a bright, directional light; gloss and scratches invisible under diffuse overhead light become visible when light rakes across the surface.

Gloss measurement: use a gloss meter at 60 degrees for most floor finishes; readings below about 40-50 GU on a finished VCT usually indicate wear or poor burnish, while readings vary by product so compare against a baseline, not a universal number.

Coating failure taxonomy: scratches (mechanical), scuffs (transfer), whitening/blush (moisture trapped under finish), yellowing (over-application or incompatible product), and peeling (poor adhesion or incompatible sealer).

Moisture testing before any coating: concrete slab moisture is checked with a calcium chloride test (ASTM F1869) or in-situ relative humidity probe (ASTM F2170); high readings predict blistering and adhesion failure.

Subfloor flatness: check with a 10-foot straightedge; most resilient flooring tolerates about 3/16 inch in 10 feet, and deviations show as hollow spots or telegraphing through thin vinyl.

Documentation: record date, area, product, dilution, and observed condition with photos at the same angle and location each cycle; this baseline is what makes a wear claim or a reschedule decision defensible.

Defect vs. soil test: rub a suspect area with a white cloth and neutral cleaner; if the mark transfers, it is soil; if it does not, it is damage to the finish or the flooring itself.

Seam and edge check: lift or probe seams, cove base, and thresholds; gaps and lifted edges admit water and are the most common origin of subfloor damage and mold.

Strip sequence: dry soil removal, then apply stripper at label dilution, dwell 5-10 minutes, agitate with a black or high-productivity pad, wet-vac slurry before it dries, then rinse twice with clean water and let dry fully.

Stripper chemistry: most are high-pH (11-13) amine or ammonia products; never mix with acid or chlorine products, and ventilate because amine vapors are irritants.

Finish build rule: apply thin coats; 3-5 coats is typical for VCT, and each coat must dry to touch (usually 20-30 minutes) before the next or the film blushes and traps solvent.

Sealer vs. finish: sealer bonds to the substrate and fills porosity; finish provides the wear layer and gloss. On porous or previously damaged VCT, one sealer coat plus 3-4 finish coats is a common build.

Burnish decision: high-speed (1500-3000 rpm) with a soft pad restores gloss on cured finish; too much heat or pressure burns the film and creates a permanent swirl or gloss band.

Repair ladder: clean and recoat for dullness; screen and recoat for light scratches; spot-strip and re-coat for isolated damage; full strip and rebuild only when the film is contaminated, yellowed, or peeling.

Carpet restoration: for wicking, treat the backing and pad, extract, and dry within 24-48 hours with air movers; for delamination or stretched seams, power-stretch and re-seam rather than patch.

Cure and traffic: most floor finishes accept foot traffic after 30-60 minutes and furniture after 24 hours; heavy rolling loads should wait 24-72 hours to avoid imprinting the soft film.