Are flashcards effective for the NASCLA exam?

Yes. Flashcards use active recall — retrieving an answer from memory — which research shows is one of the most effective study methods. They're ideal for the NASCLA's dense facts: OSHA trigger heights, bond and lien definitions, mortar types, rebar sizes, and code basics you must know cold even though the exam is open book.

What topics do the NASCLA flashcards cover?

All the exam's content areas: business, estimating and scheduling; OSHA 1926 safety (fall protection, trenching, silica); contracts, mechanics liens, surety bonds, change orders, and insurance; sitework and concrete; masonry, structural steel, and wood framing; and the building envelope, finishes, and mechanical, plumbing, and electrical systems.

How should I study with these NASCLA flashcards?

Lead with the heaviest areas — contracts and business/law are nearly half the exam — then drill the trade divisions. Mix the modes: flip to learn, type to test recall, match for speed, and quiz to check yourself. Burn in the facts you can't afford to look up on exam day, like markup vs. margin and the OSHA trigger heights.

Are the NASCLA flashcards free?

Yes — 100% free, all four study modes, no paywall.

Do these flashcards match the current NASCLA exam?

Yes. The cards follow the current NASCLA Accredited Commercial General Building Contractor exam content and its approved references — the NASCLA business and law guide, the IBC, ACI 318, and the OSHA 1926 standards — so they reflect the active exam.

What is a mechanics lien?

A legal claim against improved private property securing payment for labor or materials actually incorporated into the work.

Markup is profit as a % of cost; margin is profit as a % of the selling price. The two percentages are never equal.

Formula: price from markup?

Price = cost × (1 + markup %). A $500 cost with 40% markup = $700.

Formula: price from margin?

Price = cost ÷ (1 − margin %). A $500 cost at a 40% margin = $833.33.

Convert a target margin to markup?

Markup % = margin % ÷ (1 − margin %). A 30% margin needs about a 43% markup.

What is a quantity takeoff?

The measured count of every material and labor item required by the construction documents — the basis of an estimate.

What is a waste factor?

An added allowance for material lost to cuts, breakage, and offcuts, so enough material is ordered.

What is an allowance in a bid?

A fixed sum carried in the estimate for an item whose final selection or cost is not yet known.

Job overhead vs. general overhead?

Job overhead (general conditions) is project-specific (superintendent, field office). General overhead is company-wide, spread across all jobs.

What is a contingency in a bid?

An allowance for unknown or unforeseen costs, sized to the project's risk.

The cost stack in a bid?

Direct cost + job overhead + general overhead + contingency + profit (markup) = bid price.

How is excavation typically priced?

By the cubic yard (CY); compute length × width × depth and apply a swell or shrinkage factor.

What is a board foot?

A lumber volume unit: 1 ft × 1 ft × 1 in. Lumber is often priced per thousand board feet (MBF).

What is the critical path?

The longest chain of dependent activities through a schedule and the shortest time to finish; its activities have zero float.

What is float (slack)?

The time an activity can be delayed without delaying the project end date (total float) or the next activity (free float).

The time an activity can be delayed without delaying the early start of the next activity.

Fast-tracking vs. crashing?

Fast-tracking overlaps activities planned in sequence (more risk). Crashing adds resources to critical-path activities (more cost).

Forward pass: early finish?

Early finish = early start + duration.

When is an activity on the critical path?

When it has zero total float — any delay to it delays the whole project.

What does a delay claim usually hinge on?

Whether the delayed activity was on the critical path (only those delays push the completion date).

What is a precedence diagram?

A schedule network showing activities as boxes and their logical dependencies; activities sharing a predecessor can run in parallel.

What is bonding capacity?

The largest volume of bonded work a surety will back for a contractor; it grows with working capital and net worth.

Gross margin from price and profit?

Margin % = profit ÷ selling price. A $700 price with $200 profit = about 28.6% margin.

What is a unit cost in estimating?

The cost to install one unit of work (e.g., per CY, per SF), multiplied by the takeoff quantity to price an item.

What is a subcontractor bid?

A price from a specialty trade contractor that the general contractor carries in its own bid to the owner.

What is general conditions cost?

Project-specific overhead — superintendent, trailer, temporary utilities, permits, cleanup — also called job overhead.

Why memorize markup/margin for the exam?

It is open book, but the time pressure means you cannot afford to look up basic business math — it must be automatic.

Which OSHA standard governs construction?

29 CFR Part 1926 — the OSHA construction standards.

Fall protection trigger height (general construction)?

6 feet or more above a lower level (Subpart M).

Scaffold fall-protection trigger?

Above 10 feet on most scaffold platforms.

Excavation protective-system trigger?

5 feet of depth or more, unless entirely in stable rock (Subpart P).

When is a stair or ladder required at access points?

At a break in elevation of 19 inches or more with no ramp or runway.

Personal fall arrest anchorage strength?

Must support 5,000 pounds per worker (or be designed by a qualified person with a safety factor of two).

Methods of fall protection?

Guardrail systems, safety nets, and personal fall arrest systems.

What is a controlled access zone?

An area where certain work may proceed without conventional fall protection, with entry limited to authorized workers.

Warning-line setback on a low-slope roof?

At least 6 feet from the edge (further where mechanical equipment is used).

OSHA soil classifications?

Stable rock and Types A, B, and C — A is most stable, C is least.

Type C soil sloping ratio?

1.5:1 (about 34°) — the flattest, because it is least stable.

Water in a trench — what's required?

Special precautions (e.g., dewatering, support, or monitoring) before workers enter.

Who classifies excavation soil?

A competent person, who also inspects the excavation daily.

Your FREE NASCLA Flashcards 2026 – 200+ Cards

Realistic, NASCLA exam-style flashcards across every content area — flip, match, type, and quiz yourself on business & law, OSHA safety, contracts, and the construction divisions.

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NASCLA Flashcards

What is a mechanics lien?: A legal claim against improved private property securing payment for labor or materials actually incorporated into the work.
Markup vs. margin?: Markup is profit as a % of cost; margin is profit as a % of the selling price. The two percentages are never equal.
Formula: price from markup?: Price = cost × (1 + markup %). A $500 cost with 40% markup = $700.
Formula: price from margin?: Price = cost ÷ (1 − margin %). A $500 cost at a 40% margin = $833.33.
Convert a target margin to markup?: Markup % = margin % ÷ (1 − margin %). A 30% margin needs about a 43% markup.
What is a quantity takeoff?: The measured count of every material and labor item required by the construction documents — the basis of an estimate.
What is a waste factor?: An added allowance for material lost to cuts, breakage, and offcuts, so enough material is ordered.
What is an allowance in a bid?: A fixed sum carried in the estimate for an item whose final selection or cost is not yet known.
Job overhead vs. general overhead?: Job overhead (general conditions) is project-specific (superintendent, field office). General overhead is company-wide, spread across all jobs.
What is a contingency in a bid?: An allowance for unknown or unforeseen costs, sized to the project's risk.
The cost stack in a bid?: Direct cost + job overhead + general overhead + contingency + profit (markup) = bid price.
How is excavation typically priced?: By the cubic yard (CY); compute length × width × depth and apply a swell or shrinkage factor.
What is a board foot?: A lumber volume unit: 1 ft × 1 ft × 1 in. Lumber is often priced per thousand board feet (MBF).
What is the critical path?: The longest chain of dependent activities through a schedule and the shortest time to finish; its activities have zero float.
What is float (slack)?: The time an activity can be delayed without delaying the project end date (total float) or the next activity (free float).
What is free float?: The time an activity can be delayed without delaying the early start of the next activity.
Fast-tracking vs. crashing?: Fast-tracking overlaps activities planned in sequence (more risk). Crashing adds resources to critical-path activities (more cost).
Forward pass: early finish?: Early finish = early start + duration.
When is an activity on the critical path?: When it has zero total float — any delay to it delays the whole project.
What does a delay claim usually hinge on?: Whether the delayed activity was on the critical path (only those delays push the completion date).
What is a CPM schedule?: A critical path method schedule that networks activities, durations, and dependencies to find the project's critical path.
What is a precedence diagram?: A schedule network showing activities as boxes and their logical dependencies; activities sharing a predecessor can run in parallel.
What is bonding capacity?: The largest volume of bonded work a surety will back for a contractor; it grows with working capital and net worth.
Gross margin from price and profit?: Margin % = profit ÷ selling price. A $700 price with $200 profit = about 28.6% margin.
What is a unit cost in estimating?: The cost to install one unit of work (e.g., per CY, per SF), multiplied by the takeoff quantity to price an item.
What is a subcontractor bid?: A price from a specialty trade contractor that the general contractor carries in its own bid to the owner.
What is general conditions cost?: Project-specific overhead — superintendent, trailer, temporary utilities, permits, cleanup — also called job overhead.
Why memorize markup/margin for the exam?: It is open book, but the time pressure means you cannot afford to look up basic business math — it must be automatic.
Which OSHA standard governs construction?: 29 CFR Part 1926 — the OSHA construction standards.
Fall protection trigger height (general construction)?: 6 feet or more above a lower level (Subpart M).
Scaffold fall-protection trigger?: Above 10 feet on most scaffold platforms.
Steel erection fall-protection trigger?: 15 feet (Subpart R).
Excavation protective-system trigger?: 5 feet of depth or more, unless entirely in stable rock (Subpart P).
When is a stair or ladder required at access points?: At a break in elevation of 19 inches or more with no ramp or runway.
Personal fall arrest anchorage strength?: Must support 5,000 pounds per worker (or be designed by a qualified person with a safety factor of two).
Max arresting force on the body (body harness)?: 1,800 pounds.
What is a competent person?: Someone who can identify hazards and has authority to take prompt corrective action to eliminate them.
Methods of fall protection?: Guardrail systems, safety nets, and personal fall arrest systems.
What is a controlled access zone?: An area where certain work may proceed without conventional fall protection, with entry limited to authorized workers.
Warning-line setback on a low-slope roof?: At least 6 feet from the edge (further where mechanical equipment is used).
OSHA soil classifications?: Stable rock and Types A, B, and C — A is most stable, C is least.
Type C soil sloping ratio?: 1.5:1 (about 34°) — the flattest, because it is least stable.
Spoil pile setback from a trench?: At least 2 feet from the edge.
Water in a trench — what's required?: Special precautions (e.g., dewatering, support, or monitoring) before workers enter.
Who classifies excavation soil?: A competent person, who also inspects the excavation daily.
What is respirable crystalline silica?: Fine dust released by cutting, grinding, or drilling concrete and masonry; OSHA limits exposure and requires dust controls.
How is silica dust controlled?: Engineering controls — water (wet methods) or vacuum dust collection — plus a written exposure-control plan.
What is the OSHA Job Safety and Health poster?: A required posting informing workers of their rights and protections under OSHA.
How are flammable liquids stored on site?: In approved, labeled containers and approved storage, away from ignition sources.
What is PPE?: Personal protective equipment — gear (hard hats, eye/hearing/respiratory protection, gloves) the employer must provide for the hazard.
What is a guardrail midrail?: An intermediate member installed about halfway between the top rail and the walking surface where there is no wall.
Scaffold load capacity requirement?: A scaffold must support its own weight plus at least 4 times the maximum intended load.
When OSHA and a stricter state rule conflict?: Comply with the more protective (stricter) requirement.
What is a personal fall arrest system (PFAS)?: A body harness, connector/lanyard, and anchorage that arrest a worker's fall and limit forces on the body.
Can a mechanics lien attach to public property?: No — liens generally cannot attach to government-owned property; a payment bond protects workers there instead.
What is a preliminary (pre-lien) notice?: An early notice many states require to preserve lien rights, warning the owner a lien may be filed if unpaid.
What happens if a lien deadline is missed?: The lien rights generally expire — recording deadlines are strict.
Conditional vs. unconditional lien waiver?: A conditional waiver takes effect only when payment clears; an unconditional waiver releases the rights immediately.
What can a mechanics lien cover?: Labor, materials, or equipment actually incorporated into the improved property.
Three parties to a surety bond?: The principal (contractor), the obligee (owner), and the surety (bonding company).
What is a bid bond?: A surety bond guaranteeing the winning bidder will enter the contract and post the required bonds.
What is a performance bond?: A surety bond guaranteeing the project will be completed if the contractor defaults.
What is a payment bond?: A surety bond guaranteeing subcontractors and suppliers are paid — important on public work where liens can't attach.
Surety bond vs. insurance?: A surety expects to be repaid by the principal for any loss it pays; insurance spreads loss without expecting repayment.
What does a payment bond protect against?: The prime contractor failing to pay its subcontractors and suppliers.
What is a maintenance bond?: A bond guaranteeing the completed work will be free from defects for a stated period after completion.
What is the Miller Act?: A federal law requiring performance and payment bonds on most federal construction contracts.
What are Little Miller Acts?: State counterparts to the Miller Act requiring bonds on state and local public construction.
What is a change order?: A written, signed amendment to the contract that adds, deletes, or modifies scope and adjusts the contract price and time.
Why must extra work be in writing?: Without a signed change order, a contractor often cannot recover payment for field-directed extra work.
What is a deductive change order?: A change order that deletes scope and reduces the contract price.
What is retainage?: A percentage (commonly 5–10%) withheld from each progress payment until completion, as leverage to ensure the work is finished.
Why do owners withhold retainage?: To ensure the contractor completes the work and corrects defects before receiving full payment.
What is a notice to proceed?: The owner's written authorization to start work; it often establishes the start of contract time.
What is a lump sum (fixed price) contract?: One fixed price for fully defined scope; the contractor bears the risk that actual cost exceeds the price.
What is a cost-plus contract?: The owner reimburses actual cost plus a fee; lets work start before design is final, but the owner bears more cost risk.
What is a guaranteed maximum price (GMP)?: A cost-reimbursable contract with a cap; overruns above the GMP fall on the contractor.
What is a unit-price contract?: A set price per unit of work (e.g., per CY), used when quantities are uncertain but the work is well defined.
Who bears cost risk under lump sum?: The contractor — the price is fixed regardless of actual cost.
Cost-plus-percentage-of-cost incentive problem?: Higher costs increase the contractor's fee, reducing the incentive to control cost.
What is workers compensation insurance?: Insurance covering employee medical costs and lost wages from job injuries; required for contractors with employees.
What is builder's risk insurance?: Property insurance covering a building under construction against fire, theft, and weather damage.
What does general liability insurance cover?: Third-party bodily injury and property damage claims arising from the contractor's operations.
Why verify subcontractor insurance?: So uncovered subcontractor-employee injuries do not become the general contractor's liability.
Elements of a valid contract?: Offer, acceptance, consideration, legal capacity, and a legal purpose.
What is the statute of frauds?: A rule requiring certain contracts to be in writing to be enforceable.
What is the standard Proctor test?: A lab test setting a soil's maximum dry density and optimum moisture content, used as the field compaction target.
What is optimum moisture content?: The water content at which a soil reaches its maximum dry density under a given compaction effort.
Why compact fill in thin lifts?: Thinner layers let compaction energy reach the full depth of the layer for uniform density.
Effect of soil too dry on compaction?: Lower achievable density — dry soil resists particle rearrangement (as does soil that is too wet).
What is a shrinkage factor?: A multiplier converting bank-measure (in-place) cut to compacted fill volume, since compaction removes voids.
How to handle expansive clay under a slab?: Over-excavate and replace it with non-expansive structural fill.
What is a silt fence?: A temporary sediment barrier; it must be trenched into the ground at the bottom or sediment escapes beneath it.
What is a proof-roll?: Driving a loaded truck over a subgrade to reveal soft, yielding areas that deflect or rut.
What does a lower water-cement ratio do?: Produces denser, stronger, more durable concrete (but lower workability).
How to raise slump without weakening concrete?: Add a water-reducing admixture — never just add water.
What is slump?: A measure of fresh concrete's consistency or workability, measured with the slump cone test.
What is air-entrained concrete?: Concrete with tiny intentional air voids that relieve freeze-thaw pressure, improving durability.
How is concrete compressive strength verified?: By breaking molded cylinders in a compression test (e.g., at 7 and 28 days).
What does a rebar number mean?: The bar's nominal diameter in eighths of an inch — a No. 5 bar is 5/8 inch.
What is concrete cover?: The minimum distance from reinforcing steel to the concrete surface, protecting the steel from corrosion.
How is rebar held at the correct cover?: With chairs and bolsters that support the bars at the specified height.
What raises lateral pressure on wall forms?: A faster concrete placement rate increases the lateral pressure the forms must resist.
Why coat form faces with a release agent?: To prevent the concrete from bonding to the forms so they strip cleanly.
What is reshoring?: Temporary supports placed under a slab after forms are stripped to carry construction loads.
Why cure concrete?: To retain moisture so cement hydration continues, developing strength; methods include wet curing and curing compounds.
Cold-weather concreting risk?: Freezing of the mix water can stop hydration and ruin strength.
What limits maximum aggregate size?: It must pass between reinforcing bars and form faces and fit the member — typically tied to spacing and cover.
What does sulfate-resistant concrete require?: A lower maximum water-cement ratio (and often sulfate-resisting cement) for durability in sulfate soils.
Why use a membrane-forming curing compound?: It seals the surface to retain moisture for curing without continuous wetting.
Mortar types by strength?: Type M (highest), S, N, then O (lowest).
Mortar for repointing soft historic brick?: Type O — a soft, low-strength mortar; a hard mortar would damage the brick.
Mortar with strong flexural bond?: Type S — high strength plus dependable flexural bond.
What is a CMU?: A concrete masonry unit (block) with hollow cells that can be reinforced and grouted vertically.
Why use masonry control joints?: To let the wall shrink and move without random cracking; placed at height/thickness changes and near openings.
What causes a stair-step crack in CMU?: Drying shrinkage of the masonry, often where control joints are missing or misplaced.
What do brick-veneer ties do?: Resist lateral wind and seismic loads, tying the veneer back to the backup wall.
Why keep weep holes clear?: They drain water collected in the cavity; if blocked, water backs up in the wall.
What is retempering mortar?: Adding water to restore workability to mortar that has stiffened — generally allowed within about two hours.
What is a mortar proportion specification?: Defines mortar by the volume ratio of cementitious material, lime, and aggregate.
What is a fillet weld?: A triangular weld joining two surfaces at roughly a right angle; shown by a filled-triangle symbol.
Weld symbol on the arrow side?: A weld instruction placed below the reference line (on the arrow side) is made on the arrow side of the joint.
What does a circle at the symbol bend mean?: Weld all around — make the weld continuously around the entire joint.
What does a solid flag on a weld symbol mean?: The weld is a field weld, made on site rather than in the shop.
What is the turn-of-nut method?: Pretensioning a high-strength bolt by rotating the nut a specified amount past snug-tight.
What is snug-tight?: The condition where steel plies are in firm contact, typically from a few impacts of an impact wrench.
What is a direct tension indicator washer?: A washer that gives a visual confirmation a high-strength bolt has reached the required tension.
What does W12×26 mean?: A wide-flange steel shape about 12 inches deep weighing 26 pounds per foot.
What do anchor bolts do?: Transfer column base-plate loads into the concrete foundation; cast-in-place anchors are most reliable.
Why non-shrink grout under a base plate?: To provide uniform bearing that transfers the column load evenly to the foundation.
Platform vs. balloon framing?: In platform framing, each floor is built as a platform before the walls above; balloon studs run full height past floors.
What is a header (in framing)?: A beam over a wall opening that carries loads to jack studs against full-height king studs.
What are jack (trimmer) studs?: Studs that support the header at an opening, nailed to full-height king studs.
What is LVL?: Laminated veneer lumber — an engineered beam of glued veneers that is straight, strong, and stable.
Why does LVL outperform solid sawn lumber?: It disperses natural defects across many thin veneers, giving more uniform strength.
When is pressure-treated lumber required?: Where wood contacts concrete, masonry, or the ground (sill plates, ledgers, posts).
Fasteners for modern treated lumber?: Hot-dipped galvanized or stainless — the copper-based treatment corrodes ordinary steel.
Can you field-cut a wood truss member?: No — each member is engineered as part of the whole; cutting it can cause failure.
What is truss bracing?: Temporary and permanent bracing that keeps installed trusses stable until the structure is complete.
What does 'joists at 16 inches on center' mean?: The spacing measured from the center of one joist to the center of the next is 16 inches.
What is a top plate in framing?: A continuous horizontal member tying the top of a stud wall together and distributing roof/floor loads.
Where does a vapor retarder go in a cold climate?: On the warm-in-winter (interior) side of the insulation, to stop indoor moisture from condensing in the wall.
Vapor retarder caution in hot-humid climates?: An interior vapor retarder can trap inward-driven moisture — generally avoided there.
Vapor retarder vs. air barrier?: A vapor retarder slows vapor diffusion; an air barrier stops bulk air leakage — different jobs.
What is R-value?: A measure of a material's resistance to conductive heat flow; higher means better insulation.
What is thermal bridging?: Heat loss through a conductive path (such as a stud) that bypasses the insulation.
What is flashing?: Sheet material that directs water away from joints and intersections, like where a roof meets a wall.
What is roofing underlayment?: A secondary water-shedding barrier installed on the deck beneath shingles; laps shed water downslope.
What is a single-ply membrane roof?: A low-slope roof covered by one prefabricated sheet (e.g., TPO, EPDM, PVC).
Where is safety glazing required (IBC)?: In hazardous locations — in and beside doors, low windows near floors, and shower/tub enclosures.
What is tempered glass?: Heat-treated safety glass that breaks into small, relatively harmless pieces.
What does low-E glazing do?: Reduces radiant heat transfer through the glass, lowering cooling (and heating) loads.
Which way do assembly egress doors swing?: In the direction of egress travel, away from the occupied space.
Accessible door hardware requirement?: Lever-style hardware operable with one hand without tight grasping, pinching, or twisting.
What does a fire-rated door need?: A self-closing or automatic-closing device and limited glazing area to keep its rating.
What is Type X gypsum board?: Fire-rated gypsum board with a core that resists fire, used in rated wall and ceiling assemblies.
What backing goes behind wet-area tile?: Cement backer board — gypsum board fails when directly exposed to wet conditions.
What is a Level 5 gypsum finish?: The highest finish — a skim coat over the entire surface for uniformity under critical lighting.
Hang gypsum board: ceiling or walls first?: The ceiling first, then the walls, so the wall boards help support the ceiling edges.
What is a corner bead?: A metal or composite strip protecting an outside gypsum-board corner in high-traffic areas.
Why use a drywall primer/sealer before paint?: It equalizes the differing absorption of the paper face and the joint compound for a uniform finish.
What is a backflow preventer?: A device that stops contaminated water from being siphoned back into the potable water supply.
What is a reduced-pressure (RP) assembly?: A high-hazard backflow preventer used where cross-connection contamination risk is greatest.
What is a fixture unit?: A standardized measure of a plumbing fixture's probable demand, used to size supply and drainage.
Why are plumbing vents needed?: They equalize air pressure so the trap seal isn't siphoned out, blocking sewer gas.
What is a grease interceptor?: A device that captures fats, oils, and grease from kitchen wastewater before it enters the sewer.
What is a thermal expansion tank?: A tank that absorbs the expansion of heated water in a closed system with a backflow preventer.
Effect of an oversized HVAC unit?: It short-cycles, reducing dehumidification and comfort — size from a proper load calculation.
Sensible vs. latent HVAC load?: Sensible load is temperature (dry heat); latent load is moisture that must be removed from the air.
Risk of too little combustion air?: Incomplete combustion can produce carbon monoxide in fuel-fired equipment.
Max conduit fill for >2 conductors?: 40% of the conduit's cross-sectional area (NEC), to limit heat buildup.
Why ground an electrical system?: To establish a low-impedance fault-current path so overcurrent devices clear faults safely.
Must neutral and ground be bonded everywhere?: No — they bond only at the service; downstream they must remain separated to avoid current on grounding conductors.
What is a branch circuit breaker?: An overcurrent device protecting an individual circuit serving outlets, lighting, or equipment.
What sizes a main breaker?: The maximum current the panel and its conductors are rated to carry safely.
What is a productivity (production) rate?: The quantity of work a crew completes per unit time (e.g., 600 SF/day), used to estimate activity durations.
Duration from quantity and production rate?: Duration = total quantity ÷ daily production. 9,000 units ÷ 600/day = 15 crew-days.
What is a near-critical path?: A path with very little float that can become critical if its activities slip — watch it closely.
What is a request for information (RFI)?: A written question to the design team to resolve conflicts or gaps in the construction documents.
Which document usually controls over the drawings?: When in conflict, the resolution comes through an RFI; specifications and figured dimensions generally govern over scaled drawings.
What is a profit margin (gross)?: Gross profit divided by revenue (selling price), expressed as a percentage.
Why can a leaner contractor bid lower?: Lower general overhead means less must be added to direct cost, so the bid can be lower while still meeting margin.
What is a stipulated sum agreement?: Another name for a lump sum (fixed price) contract — one agreed sum for the defined work.
What are direct costs?: Labor, material, equipment, and subcontract costs for performing the actual work, before overhead and profit.
What is the purpose of a schedule?: To sequence activities, set durations, find the critical path, and manage time and resources to the completion date.
What is the alternative exposure control method (silica)?: Assessing actual employee exposures and keeping them below the permissible exposure limit, instead of the specified control table.
What is the silica action level?: The exposure threshold (a time-weighted average) above which additional protections, such as monitoring, are triggered.
Where is fall protection required besides edges?: At hoist areas, holes, leading edges, ramps, runways, excavations, and overhand bricklaying, among others.
What is a safety net system?: A net installed below a work area to catch a falling worker, an accepted form of fall protection.
What is benching (excavation)?: Cutting the excavation sides into horizontal steps to protect against cave-ins, used in certain soils.
What is shoring?: A support system (e.g., hydraulic or timber) that braces excavation walls to prevent cave-ins.
What is a trench shield (trench box)?: A protective structure that shields workers from a cave-in within the box, without supporting the walls.
When can excavation sides be vertical?: When the excavation is made entirely in stable rock.
What hazard does a hard hat protect against?: Falling or flying objects and electrical shock to the head, per OSHA PPE requirements.
What does a competent person inspect on a scaffold?: Its construction, capacity, fall protection, and stability — before each shift and after any event affecting integrity.
What is lien priority?: The order in which liens are paid from foreclosure proceeds; it can determine who gets paid first.
Risk if an owner pays the GC but subs aren't paid?: Subs may file liens against the property even though the owner already paid — hence lien waivers and joint checks.
What is a differing site condition?: A hidden physical condition differing materially from the contract documents, often grounds for a change order.
What is prompt-payment law?: A statute setting deadlines for payments (and retainage release) on public, and sometimes private, projects.
What does a notice to proceed establish?: Often the start of contract time, which matters when liquidated damages are tied to the completion date.
What are liquidated damages?: A pre-agreed daily amount the contractor owes for finishing late, tied to the contract completion date.
What is the obligee on a bond?: The party protected by the bond — usually the project owner.
What is the principal on a bond?: The party whose obligation is guaranteed — the contractor who must perform or pay.
Advantage of cost-plus over lump sum?: It allows construction to begin before the design is fully complete.
What is time and materials (T&M)?: A contract paying for labor at set rates plus materials at cost, often for small or uncertain-scope work.
What is express vs. implied contract?: An express contract states its terms (written or spoken); an implied contract is inferred from conduct.
What is a forfeited bid bond?: If the low bidder won't sign, the bid bond pays the owner the difference between that bid and the next acceptable one.
What is relative compaction?: Field dry density ÷ laboratory maximum dry density, expressed as a percent (e.g., 114 ÷ 120 = 95%).
What is a slope ratio like 1.5:1?: Horizontal run to vertical rise — 1.5 feet out for every 1 foot down; for an 18-ft cut, 27 ft of run each side.
What is positive drainage?: Grading that slopes away from a structure (e.g., 2% fall) so water doesn't pond against the foundation.
What is height of instrument (leveling)?: Benchmark elevation + backsight reading; subtract a foresight to find a new point's elevation.
What is a benchmark (surveying)?: A fixed reference point of known elevation used to establish other elevations on a site.
What does a slump cone test measure?: The consistency/workability of fresh concrete; the sample is rodded in three layers, 25 strokes each.
What is consolidation of concrete?: Vibrating or rodding to remove entrapped air so the concrete fills the forms and surrounds the rebar.
What is a control joint in a slab?: A planned, tooled or sawn joint that directs shrinkage cracking to a straight line.
Why use erosion-control blankets?: Rolled blankets anchored over disturbed slopes protect against erosion while vegetation establishes.
What is a check dam?: A small barrier placed across a channel to slow concentrated stormwater and trap sediment.
What is curb inlet protection?: A filter device at a curb inlet that keeps sediment from entering the storm drain during construction.
What is a SWPPP?: A Stormwater Pollution Prevention Plan governing erosion and sediment controls on a disturbed site.
What is the modular dimension of CMU?: Nominal 16-inch block (including mortar joint) means 24 ft of wall = 288 in ÷ 16 = 18 units per course.
What is a king stud?: A full-height stud beside an opening that the jack studs and header bear against.
What is a structural insulated panel quirk?: Not on this exam's core, but engineered components like trusses and LVL must be installed as designed, never field-modified.
What is a corrugated metal tie?: A thin metal connector anchoring brick veneer to wood-stud backup against lateral loads.
What is a weep hole in masonry?: An opening at the base of a cavity wall letting collected water drain out; must stay clear.
What is grout in masonry?: A fluid concrete mix poured into CMU cells to bond and embed vertical reinforcing steel.
What is the snug-tight then turn-of-nut sequence?: Bring plies into firm contact (snug), then rotate the nut a specified amount to pretension the bolt.
What does embedment depth control for anchor bolts?: The pullout and load-transfer capacity of the anchor into the concrete foundation.
What is temporary bracing during steel erection?: Guy cables and bracing that keep the partially erected frame stable until permanent connections are complete.
What does a header size depend on?: The opening width and the floor/roof loads above — wider spans and heavier loads need larger headers.
What is an ice-and-water shield?: A self-adhering underlayment at eaves/valleys that resists water from ice dams and wind-driven rain.
What is a pipe boot (roof penetration)?: A flashing collar that seals where a vent pipe penetrates a sloped roof, lapped under the upslope shingles.
What is below-grade insulation chosen for?: Resistance to absorbing water, since foundation insulation stays damp.
What is a self-closing device?: Hardware that returns a fire-rated door to the closed, latched position automatically.
What is laminated glass?: Safety glazing made of glass bonded to a plastic interlayer that holds together when broken.
Why hang drywall perpendicular on commercial work?: Installing sheets horizontally reduces total linear footage of joints to finish.
What is a suspended acoustical ceiling?: A grid holding lay-in tiles, giving a finished ceiling with access to the plenum above.
What is a hose connection vacuum breaker?: A small backflow device on a hose bibb preventing back-siphonage through a garden hose.
What is duct static pressure?: Resistance to airflow in a duct system; undersized ducts raise it, increasing noise and energy use.
What is a DFU (drainage fixture unit)?: A measure of a fixture's drainage load, summed to size sanitary drains for peak probable flow.
What sets the minimum slope of a sanitary drain?: Keeping flow velocity high enough to carry solids without clogging (a minimum fall per foot).
What is the National Electrical Code (NEC)?: The model code (NFPA 70) governing electrical installations, including conduit fill and grounding rules.
What is a panelboard?: The assembly distributing power to branch circuits, each protected by an overcurrent device.
What is a load calculation (electrical)?: Comparing connected and demand loads to the panel rating to confirm capacity before adding equipment.

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By Career EmployerUpdated Sep 12, 2026

200+ free NASCLA flashcards — 4 ways to study

NASCLA Flashcard of the DayNew daily

The classic card. Do you know this one?

Click Study Flashcards above to open the flashcard hub — hundreds of NASCLA cards you can flip, match, type, or quiz yourself on. Every card is drawn from the exam’s content areas and its official references, so you study exactly what the test covers.^[1] Pair them with our free practice test and study guide.

NASCLA Flashcard Study Modes

Flip mode is the study pass: read a front, check yourself, move on. Type mode shows the definition and asks you to spell the term back, so the card that asks What is retainage? becomes a recall test rather than a recognition one. Match is the timed term-to-definition game for speed, and Quiz builds multiple choice questions from the same 243 cards.

Free NASCLA flashcards from Career Employer — active recall for the NASCLA Accredited Commercial General Building Contractor exam

Why Flashcards Work for the NASCLA Exam

The largest block is Envelope, Finishes & MEP with 48 cards, covering weatherproofing, interior finish work, and the electrical and plumbing vocabulary a licensed contractor is expected to recognize. Prompts like What is R-value? and What is flashing? sit next to equipment terms in the card that asks What is a panelboard?, and the deck also reaches into glazing and building science with cards such as What is thermal bridging?

Contracts, Liens & Bonds follows with 45 cards on the legal and payment machinery of a job. The card that asks What is retainage? sets up payment mechanics, surety material shows up in prompts like What is a payment bond?, and federal statutory content appears in the card that asks What is the Miller Act? Expect lien sequencing and change documentation in the same run.

Masonry, Metals & Wood holds 41 cards on structural materials and their connections, including the card that asks What is a CMU?, framing vocabulary in What is a king stud?, and steel shorthand in the card that asks What does W12×26 mean? Business & Project Management adds 37 cards on estimating, bidding, and scheduling, with prompts such as Markup vs. margin? and What is a CPM schedule? driving the math and planning language.

OSHA Construction Safety carries 36 cards on jobsite rules and hazard control, where recognition items like What is PPE? and What is shoring? sit beside enforcement language in the card that asks What is a competent person? Sitework & Concrete rounds out the deck with another 36 cards on earthwork, erosion control, and placement, running from the card that asks What is slump? to stormwater prompts like What is a SWPPP? and What is a silt fence?

The NASCLA exam is open book, but it is time-pressured and dense with facts you can’t afford to look up — markup vs. margin, OSHA trigger heights, the three surety bonds, mortar types, and rebar sizing.^[2] Spaced flashcards are the most efficient way to keep that knowledge instant. Used alongside our practice test and study guide, they turn review time into measurable progress.

NASCLA Flashcards by Area

The cards are organized by the exam’s content areas. Drill the business, law, and contracts decks first — together they are close to half the exam — then the construction divisions:^[1]

NASCLA flashcards by content area
Area / deck	What it covers
Business & Project Management	Estimating, takeoff, markup vs. margin, overhead, CPM scheduling
OSHA Construction Safety	Fall protection, scaffolds, trenching, silica, PPE (29 CFR 1926)
Contracts, Liens & Bonds	Mechanics liens, surety bonds, change orders, retainage, insurance
Sitework & Concrete	Compaction, erosion control, water-cement ratio, rebar, curing
Masonry, Metals & Wood	Mortar types, CMU, welding/bolting, framing, engineered lumber
Envelope, Finishes & MEP	Vapor/air control, glazing, gypsum, plumbing and electrical basics

How to Get the Most Out of These Flashcards

Start with the envelope. Envelope, Finishes & MEP is the biggest domain at 48 cards and mixes finish, glazing, and MEP vocabulary, so clearing it early removes the widest spread of unfamiliar terms.
Type the money terms. Drill the cards that ask What is retainage? and What is a mechanics lien? in Type mode, since contract and lien language has to come back exactly, not approximately.
Match the number-heavy cards. The timed game suits OSHA specifics such as the card that asks Type C soil sloping ratio? and steel callouts like What does W12×26 mean?
Move to the practice test. Once Quiz mode runs clean across Contracts, Liens & Bonds and OSHA Construction Safety, shift to the practice test for pacing and use the study guide on whatever still slips.
Rotate instead of cramming. With 243 cards across six domains, work one domain per sitting in Flip, then close with a short Match round on the domain you studied the session before.

NASCLA Flashcards FAQ

Hundreds of free NASCLA flashcards, organized by the exam's content areas — business and project management, OSHA construction safety, contracts/liens/bonds, sitework and concrete, masonry/metals/wood, and the envelope, finishes, and MEP systems. They're free with no account required.

References

1.National Association of State Contractors Licensing Agencies. “NASCLA Accredited Commercial Examination.” nascla.org. ↑
2.U.S. Occupational Safety and Health Administration. “Construction Standards — 29 CFR Part 1926.” osha.gov. ↑
3.International Code Council. “International Building Code (IBC).” iccsafe.org. ↑

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