NCCER Floor Covering cheat sheet

Resilient flooring includes vinyl (sheet and tile), linoleum, rubber, cork, and VCT; resilient means the surface recovers from indentation rather than staying deformed.

Carpet is classified by construction: tufted (most common), woven, and needle-punched; by pile: cut pile, loop pile, and cut-and-loop; and by fiber: nylon, polyester, olefin (polypropylene), and wool.

Nylon is the most abrasion-resistant common carpet fiber; polyester resists staining but has lower resilience; olefin resists moisture and chemicals but has low heat resistance; wool is naturally flame-resistant and resilient but costly.

Soft-surface flooring includes carpet, carpet tile, and area rugs; hard-surface flooring includes ceramic and porcelain tile, stone, terrazzo, wood, laminate, and resilient products.

Laminate flooring is a floating composite of a wear layer, printed decor layer, core (often HDF), and backing; it is not solid wood and generally cannot be refinished.

Solid wood flooring is milled from one piece of lumber, typically 3/4 in. thick, and can be sanded and refinished; engineered wood has a plywood core with a veneer top and limited refinishing life.

Tile is rated by the Porcelain Enamel Institute (PEI) wear scale from I (no foot traffic) to V (heavy commercial); grout joint width and latex-portland cement mortar selection follow ANSI A108 standards.

Adhesive families include pressure-sensitive, hard-set (dry-set/thin-set), epoxy, and urethane; adhesive selection must match the backing, substrate, and moisture conditions of the job.

OSHA 29 CFR 1926 Subpart M requires fall protection at 6 ft or more in construction; floor-covering work near open edges, elevator shafts, and mezzanines falls under this rule.

Personal protective equipment for flooring tasks typically includes safety glasses, knee pads, cut-resistant gloves, hearing protection when using strippers or saws, and respirators when sanding or handling silica-containing material.

Silica dust from cutting concrete, mortar, or tile is a carcinogen; OSHA 29 CFR 1926.1153 requires engineering controls (wet cutting or dust collection) and, when triggered, a written exposure control plan.

Adhesives, sealers, and strippers emit VOCs; work areas require ventilation, and SDS sheets must be on site and reviewed before use per OSHA Hazard Communication (29 CFR 1926.59).

Utility knives cause a large share of flooring injuries; cut away from the body, change blades when dull, and retract the blade when not in use.

Knee pads or kneeling boards reduce cumulative trauma; prolonged kneeling on hard substrates is an ergonomic hazard recognized in flooring trades.

Electrical safety: use GFCI-protected circuits for power tools and wet areas, inspect cords for damage, and lock out/tag out before servicing equipment.

Housekeeping and material handling: stack carpet and resilient rolls to prevent rolling, keep walkways clear, and use team lifting or mechanical aids for rolls over about 50 lb.

Concrete slabs must be clean, dry, sound, and flat; typical flatness tolerance for resilient flooring is 1/8 in. in 10 ft (or 3/16 in. in 10 ft for some products) measured with a 10-ft straightedge.

Moisture testing of concrete uses ASTM F1869 (calcium chloride, limit typically 3 lb/1000 sq ft/24 hr) or ASTM F2170 (in-situ relative humidity, limit typically 75-80% RH); test results must be compared to the adhesive and flooring manufacturer's limits.

pH of concrete should generally be 7-10; high pH or efflorescence indicates alkalinity that can degrade adhesives; a primer or sealer may be required.

Concrete surface profile for adhesive bonding is typically CSP 3-5 per ICRI; shot blasting, grinding, or scarifying achieves this; acid etching is not recommended for resilient flooring.

Wood subfloors must be structurally sound, with joist spacing and panel thickness per the flooring manufacturer; typically 3/4 in. plywood or OSB with 1/8 in. expansion gaps between panels.

Wood subfloor moisture content should be within 2-4% of the flooring's moisture content before installation; a moisture meter is used to verify.

Patch and underlayment: use a cementitious patching compound for concrete and a gypsum-based patch for wood; self-leveling underlayment is used to correct flatness over large areas.

Contaminants that must be removed before installing flooring include paint, drywall mud, oil, wax, curing compounds, and old adhesive residue; bond tests or pH/moisture tests confirm readiness.

Carpet installation methods include stretch-in (tackless) over tack strip and cushion, direct glue-down, double glue-down, and modular carpet tile; stretch-in requires a power stretcher, not just a knee kicker, for rooms over about 30 ft.

Tack strip is nailed around the perimeter with pins angled toward the wall; carpet is stretched over it and tucked into the gully with a stair tool or tucking chisel.

Vinyl sheet installation uses full-spread adhesive, perimeter (double-cut) adhesive, or loose lay depending on product; seams are cut with a straightedge and sealed with a seam sealer or welded with heat.

VCT is installed with pressure-sensitive or hard-set adhesive; tiles are laid in a predetermined pattern, rolled with a 100-lb roller after adhesive flash-off, and allowed to set before traffic.

Ceramic and porcelain tile installation uses thin-set mortar applied with a notched trowel; trowel notch size depends on tile size; back-buttering improves coverage; grout is applied after mortar cures.

Wood flooring installation methods include nail-down (over wood subfloor), staple-down, glue-down, and floating; expansion gaps of about 1/4-3/8 in. are left at walls and covered with base or shoe molding.

Laminate is typically installed as a floating floor over a foam or combination underlayment with a vapor barrier; planks are clicked or tapped together and expansion gaps are maintained at perimeters.

Cove base and wall base are installed after flooring; cove base is set with adhesive and rolled; stair nosings, reducer strips, and transition strips are installed at floor height changes.

Square the room using the 3-4-5 (Pythagorean) method: measure 3 ft along one wall, 4 ft along the perpendicular, and adjust until the diagonal is 5 ft; scale up (6-8-10, 9-12-15) for larger rooms.

Chalk lines establish working lines; for tile, snap a centerline and a perpendicular line, then dry-lay to check that cut tiles at edges are not less than half a tile wide.

Carpet is estimated by the square yard (9 sq ft); add 10-15% for waste, more for patterned carpet with a match, and account for roll width (typically 12 ft or 15 ft) and seam placement.

Resilient sheet flooring is estimated by the square yard or square foot; account for pattern match, roll width (6 ft or 12 ft), and seam direction relative to light and traffic.

Tile quantity = area / tile area, plus 10% waste for field tile and 15-20% for diagonal layouts, mosaic patterns, or complex cuts.

Adhesive coverage is stated on the product label in square feet per gallon; divide total area by coverage to get gallons, then round up to full containers.

A takeoff lists each material with quantity, unit, and waste factor; a cut sheet or work order lists rooms, dimensions, materials, and installation sequence.

Jobsite documentation includes the contract, submittals, shop drawings, change orders, daily reports, and a punch list; change orders must be signed before extra work proceeds.

Underlayment and cushion are rated by thickness and density; carpet cushion is typically 1/4 to 1/2 in. thick, and density affects comfort, durability, and warranty.

Carpet pile direction affects appearance; all rolls in a room should be installed with pile running the same direction to avoid shading differences at seams.

Resilient tile patterns include monolithic, checkerboard, ashlar, and basketweave; pattern choice affects waste and layout lines.

Adhesive open time is the period after spreading before the flooring must be laid; exceeding open time causes poor bond and must be corrected by re-spreading.

Grout types include sanded (joints 1/8 in. and wider), unsanded (joints under 1/8 in.), epoxy (chemical resistance, no sealing), and urethane; seal grout per manufacturer.

Subfloor deflection limits: ceramic tile typically requires L/360 or stiffer, and stone often L/720; verify with the tile manufacturer and joist span tables.

Moisture barriers under wood and laminate floors are 6-mil or thicker polyethylene; seams are overlapped and taped.

Warranty terms often require specific adhesives, underlayments, and installation methods; deviating from the manufacturer's instructions can void coverage.

Fire safety: store adhesives and solvents away from ignition sources; keep a fire extinguisher rated for chemical fires (Class B) accessible.

Confined-space entry may apply to crawl spaces and subfloor voids; test atmosphere and follow permit-required confined-space rules when triggered.

Ladder safety: maintain 3-point contact, set ladders on stable surfaces, and keep the base 1 ft out for every 4 ft of height (4:1 rule).

Heat stress: flooring work in unconditioned spaces can cause heat illness; provide water, rest, and shade, and watch for confusion or cessation of sweating.

Bloodborne pathogens: cleanup of bodily fluids on carpet requires PPE and disposal per OSHA 29 CFR 1910.1030 if exposure is occupational.

Lockout/tagout applies to powered stretchers, seam irons, and flooring saws during maintenance or jam clearing.

Hand-tool safety: use the right tool for the task, keep cutting edges sharp, and never carry knives with the blade exposed.

A bond test (patch test) confirms adhesive compatibility with the substrate and existing residue; apply a small patch, cure, and check adhesion.

Gypsum-based underlayment is not suitable for areas subject to moisture; use cementitious underlayment in wet areas.

Expansion joints in concrete must be honored through the flooring or covered with a designed joint cover; do not fill structural joints with patching compound.

Radiant-heated slabs require a flooring and adhesive rated for the operating temperature; check the manufacturer's maximum surface temperature.

Old adhesive removal: use a flooring scraper or grinder with dust collection; solvent strippers may leave residue that prevents bonding.

Substrate flatness is measured with a 10-ft straightedge; low spots are filled with patch, high spots are ground down.

Wood subfloor panel gaps of about 1/8 in. allow expansion; panels should be installed with the long dimension perpendicular to joists.

Carpet seaming: cut seams along the pile direction, use a seaming iron and seam tape, and roll the seam; a poorly matched seam is visible under raking light.

Stair installation: carpet on stairs is installed with tack strip at the nose and riser, and the carpet is stretched and stapled; a stair tool tucks the carpet into the gully.

Sheet vinyl seam methods include heat welding (commercial), chemical welding with seam sealer, and overlap double-cut; seam quality depends on a straight, tight cut.

Tile layout should avoid narrow cuts at doorways and visible walls; center the layout on the primary sight line.

Thin-set mortar coverage: minimum 80% in dry areas and 95% in wet areas per ANSI; check by lifting a tile after setting.

Wood flooring acclimation: let wood acclimate in the room for the time specified by the manufacturer (often 48-72 hours) before installation.

Moisture-cure urethane and water-based finishes are used on wood floors; water-based dries faster with less odor, moisture-cure is more durable.

Waste factor rules of thumb: 5-10% for simple rectangular rooms, 10-15% for standard layouts, 15-20% for diagonal or patterned installations.

Seam placement in carpet should be away from the main sight line and perpendicular to the window wall where possible; seams in traffic lanes are avoided.

A material safety data sheet (SDS) must be available for each chemical on site; it lists hazards, PPE, and first aid.

Daily reports record weather, crew, work performed, delays, and deliveries; they support change orders and claims.

A punch list is a final walkthrough list of incomplete or defective items; closeout includes warranties, attic stock, and as-built drawings.

Estimating labor: production rates (sq ft per hour) vary by product and site conditions; use historical rates and adjust for access and demolition.

Unit conversions: 1 sq yd = 9 sq ft; 1 square = 100 sq ft; 1 acre = 43,560 sq ft.

Terrazzo is a composite of marble or granite chips in a cement or epoxy matrix; it is poured in place or precast and ground and polished.

Concrete polishing uses progressively finer diamond abrasives; densifiers harden the surface, and guards or stains provide color.

Epoxy flooring systems include self-leveling, broadcast, and mortar types; surface preparation and moisture testing are critical for adhesion.

Static control flooring is used in server rooms and electronics manufacturing; it is tested by resistance per ANSI/ESD standards.

Acoustic underlayments reduce impact sound transmission; IIC (impact insulation class) ratings are used to compare products.

Respirator use requires fit testing, medical evaluation, and training per OSHA 29 CFR 1910.134 when respirators are required.

Hazard communication: labels and SDS must be maintained, and employees trained on chemical hazards before assignment.

Scaffold and elevated platform use requires guardrails, proper decking, and trained erectors; do not modify scaffolds.

Emergency action plans should include exit routes, first aid, and spill response for adhesives and solvents.

Personal fall arrest systems require inspection before each use and anchorage rated for 5,000 lb per worker.

ASTM F710 covers preparing concrete floors for resilient flooring; it specifies cleaning, patching, and moisture and pH testing.

Relative humidity testing (ASTM F2170) uses in-situ probes at 40% of slab depth; results correlate with adhesive bond performance.

Calcium chloride testing (ASTM F1869) measures moisture vapor emission rate over 60-72 hours; results are reported in lb/1000 sq ft/24 hr.

Surface profile for concrete is measured by the CSP scale (ICRI); CSP 3 is light grinding, CSP 5 is medium shot blast.

pH testing uses a surface pH meter or pH paper on a wetted surface; readings above 10 may require a primer.

Heat-welded seams in sheet vinyl and linoleum are made by routing a groove, inserting welding rod, and trimming flush after cooling.

Carpet tile installation patterns include monolithic, quarter-turn, and ashlar; quarter-turn hides seams and is common in commercial work.

Floating wood and laminate floors require a perimeter expansion gap and transition profiles at doorways and fixed objects.

Tile crack isolation membranes (ANSI A118.12) isolate substrate cracks from the tile; uncoupling membranes decouple the tile from substrate movement.

Waterproofing membranes (ANSI A118.10) are required in wet areas such as showers and are installed before tile.

Quantity takeoff for carpet tile: divide area by tile area, add 10-15% waste, and account for pattern direction and quarter-turn layouts.

Adhesive estimating: coverage in sq ft per gallon is on the label; divide area by coverage, then round up to full units.

A change order documents scope, cost, and schedule impact and must be signed before work proceeds.

As-built drawings record actual installed conditions and are part of project closeout.

Warranty documentation includes the manufacturer's warranty, installation warranty, and maintenance instructions.