NASCLA Accredited Commercial General Contractor flashcards

The highest level of gypsum board finish, consisting of a skim coat of joint compound applied over the entire surface, providing a uniform surface suitable for critical lighting conditions and high-sheen paints.

• Required for dark colors, high-sheen paints, and critical lighting.
• Minimizes surface imperfections and texture differences.
• Achieved by applying a thin, continuous coat of joint compound.

Memory trick: High sheen, dark paint, Level 5 is your finish fate.

A two-part grout system (resin and hardener) that forms a dense, non-porous, and highly durable joint, offering excellent resistance to stains, chemicals, and mildew.

• Two-part system
• Non-porous
• High chemical/stain resistance

Memory trick: For 'commercial restrooms' and 'super durability', 'Epoxy' grout is the 'clean' choice.

The practice of applying impermeable finishes or sealants to all exposed and semi-exposed wood surfaces of millwork to prevent damage from moisture, humidity, and chemical exposure.

• Applies to all surfaces
• Impermeable barrier
• Prevents swelling, warping, degradation

Memory trick: To protect 'millwork' from 'moisture and chemicals', 'seal every surface' like a watertight 'ship'.

Methods employed during the installation of wall panels, such as using shims and leveling clips, to ensure adjacent panels are precisely aligned, flush, and level, creating a seamless surface.

• Prevents lippage
• Ensures flush joints
• Crucial for pre-finished panels

Memory trick: To make panels 'seamless', 'shim and clip' them into a perfect 'line'.

A commercial-grade wall covering with a heavier vinyl layer, offering superior durability, scrubbability, and resistance to impact and abrasion, suitable for high-traffic environments.

• Medium to heavy duty
• High scrubbability
• Resistant to impact/abrasion

Memory trick: For 'hospital corridors', 'Type II Vinyl' is the 'tough' choice that can take a 'scrubbing'.

Plywood manufactured with waterproof or moisture-resistant adhesives, designed for use in applications exposed to weather or high humidity.

• Uses Type I (fully waterproof) or Type II (water-resistant) glues.
• More dimensionally stable than solid wood in varying humidity.
• Suitable for exterior use or high-moisture interior environments like bathrooms.

Memory trick: For humid spots, choose EXTERIOR PLYWOOD, as it's built to resist the wet.

A material, typically a polyethylene film, installed beneath flooring (especially laminate or engineered wood over concrete) to prevent moisture vapor from migrating from the subfloor into the finished flooring.

• Protects moisture-sensitive flooring from warping, swelling, and mold.
• Essential over concrete slabs, in basements, or high-humidity regions.
• Usually a 6-mil or thicker polyethylene sheet with seams taped.

Memory trick: High humidity, concrete slab? Vapor barrier saves your laminate from going bad.

A highly durable and protective clear coating for wood, available in oil-based, water-based, and catalyzed (two-part) formulations.

• Offers excellent resistance to abrasion, scratches, and impact.
• Good chemical and moisture resistance.
• Catalyzed polyurethanes provide the highest level of durability for commercial use.

Memory trick: For tough wood, POLYURETHANE is the ultimate protective shield.

A two-part or three-part mortar system consisting of epoxy resins, hardeners, and often inert fillers, known for its exceptional chemical resistance, high bond strength, and impermeability.

• Ideal for demanding environments like commercial kitchens, laboratories, and industrial floors.
• Offers superior resistance to acids, alkalis, and oils.
• Provides high compressive and tensile strength, reducing cracking and delamination.

Memory trick: Kitchen's chemical chaos needs an Epoxy shield.

The measure of a subfloor's stiffness, expressed as a ratio of span length (L) to allowable deflection, which is critical for preventing cracking in rigid flooring materials like natural stone.

• Natural stone requires a much stiffer subfloor than ceramic tile (L/720 vs. L/360).
• Insufficient stiffness leads to excessive movement, causing cracks in tile and grout.
• Calculated based on joist size, spacing, subfloor thickness, and structural loads.

Memory trick: Stone's rigid nature needs a super stiff floor, or cracks will surely pour.

A two-component wood finish (urethane base and a catalyst/hardener) that cures to form an extremely hard, durable, and chemical-resistant film, ideal for high-traffic and demanding environments.

• Superior resistance to scratches, abrasion, and impact.
• Excellent chemical resistance (cleaners, solvents).
• Often used on high-end commercial millwork, floors, and cabinetry.

Memory trick: High traffic, chemical spills? Catalyzed urethane is the finish that thrills!

A specialized primer applied to a substrate before installing wallcovering, designed to seal the surface, promote adhesion, allow for repositioning, and prevent stains or imperfections from telegraphing through the wallcovering.

• Creates a uniform surface for consistent adhesive bond.
• Prevents excessive substrate absorption of adhesive.
• Often pigmented to obscure substrate color and imperfections.

Memory trick: For perfect wallcovering, a pigmented primer-sealer is the key player.

Preventative measures against efflorescence in natural stone and tile installations, primarily focusing on managing moisture content in the substrate and setting materials to stop salt migration.

• Soluble salt migration
• Moisture-driven
• Dry substrate is key

Memory trick: To stop 'efflorescence' from 'salts and water', keep the 'floor dry' like a desert.

Classification system (ASTM C635) for suspension systems based on their load-carrying capacity, determining suitability for different types and weights of acoustical tiles or panels.

• Light-duty: For light fixtures and minimal loads.
• Intermediate-duty: For typical acoustical tiles and some light fixtures.
• Heavy-duty: For heavy tiles, multiple fixtures, or air distribution systems.

Memory trick: Heavy tiles need strong grids, or they'll sag like tired lids.

The application of a penetrating sealer or appropriate barrier coating to the unexposed (back and sides) surfaces of natural stone tiles prior to installation to prevent moisture, minerals, or contaminants from migrating from the setting bed into the stone.

• Prevents efflorescence, discoloration, and picture-framing.
• Crucial for moisture-sensitive stones or installations over concrete slabs.
• Ensures the aesthetic integrity and longevity of the stone.

Memory trick: For stone, back-seal the bottom, face-seal the top, no efflorescence will pop.

The precise maximum allowable deviation in a substrate's surface, typically 1/16 inch over a 10-foot span, required for successful installation of tiles with at least one edge 15 inches or longer.

• Crucial for preventing lippage
• Ensures proper adhesive coverage
• Stricter than for smaller tiles

Memory trick: Big tiles need a 'flat' path, like a 1/16 inch smooth road for a long journey.

A specialized primer formulated to withstand and block the high pH (alkalinity) found in new masonry, concrete, and plaster surfaces, preventing damage to subsequent paint layers.

• Essential for new or unsealed alkaline substrates.
• Prevents efflorescence, discoloration, and adhesion failure of topcoats.
• Creates a stable surface for optimal paint performance.

Memory trick: New plaster's bite needs an alkali shield, paint's future revealed.

The highest classification for surface burning characteristics of building materials, primarily based on a Flame Spread Index of 0-25 and a Smoke Developed Index of 0-450.

• Highest fire safety classification
• FSI 0-25
• SDI 0-450

Memory trick: To get a Class A, the 'Flame' must 'Spread' slowly, and 'Smoke' must be 'Developed' minimally.

A two-part catalyzed finish for wood, characterized by its high solids content, fast cure, exceptional hardness, durability, and chemical resistance.

• Often used in commercial millwork, kitchens, and laboratories.
• Requires professional application due to fast cure and potential for fumes.
• Forms a very hard, non-yellowing film (when properly formulated).

Memory trick: Commercial demands conversion for lasting, tough elegance.

Specialized threaded fasteners designed for attaching gypsum board to wood or metal framing, characterized by a bugle head and sharp point.

• Superior holding power compared to nails.
• Bugle head prevents tearing of the paper face and ensures a flush finish.
• Available in various lengths and thread types for different applications (wood or metal studs).

Memory trick: Screws secure ceilings, stopping pops with steady hold.

A system of clips, straps, and wedges used during tile installation to mechanically hold adjacent tiles level and eliminate lippage as the adhesive cures, especially critical for large format tiles.

• Ensures a flush, even surface between tiles.
• Reduces installation time and improves aesthetic quality.
• Essential for large format tiles (LVT) and rectified tiles.

Memory trick: Large tiles, no lippage? Leveling system is the golden ticket.

A two-component primer containing a high concentration of zinc dust that provides galvanic and barrier corrosion protection, and excellent adhesion to galvanized steel and other ferrous metals.

• Chemically bonds well with zinc in galvanized coatings.
• Offers sacrificial (galvanic) protection against rust.
• Essential for painting new or weathered galvanized steel.

Memory trick: Galvanized steel with spangle? Zinc-rich primer is the right angle.

Measures taken to safeguard finished millwork components (e.g., cabinets, trim, doors) from damage during shipping, storage, and especially during and after installation on a construction site.

• Crucial for maintaining aesthetic quality and avoiding costly repairs/replacement.
• Includes temporary coverings, proper handling, and designated storage areas.
• Protection should remain until final cleaning and project handover.

Memory trick: Cover and guard the fine wood, through construction's busy mood.

Methods used to quantify the moisture content or moisture vapor emission rate of a concrete slab, crucial for preventing moisture-related failures in flooring installations.

• Calcium Chloride Test (ASTM F1869): Measures moisture vapor emission rate (MVER).
• In-Situ Relative Humidity (RH) Test (ASTM F2170): Measures internal RH of the slab.
• Results dictate the need for and type of moisture mitigation systems (e.g., vapor barriers, epoxy moisture barriers).

Memory trick: Slab's hidden dampness, test it first, save the floor's goodness.

A single-number rating indicating the effectiveness of a suspended ceiling system in blocking sound transmission between adjacent rooms through the plenum.

• Measures sound blocking, not sound absorption.
• Higher CAC values (e.g., 35+) indicate better sound privacy between rooms.
• Distinguished from NRC (Noise Reduction Coefficient).

Memory trick: CAC is the CEILING's sound BLOCKADE between rooms.

The period during which an adhesive remains wet and workable after application, allowing for adjustment and repositioning of materials.

• Crucial for installing delicate, custom, or large-patterned wallcoverings.
• Prevents premature drying and enables thorough bubble removal.
• Contrasts with 'initial tack,' which is immediate stickiness.

Memory trick: For delicate walls, the adhesive needs a LONG OPEN TIME to let you perfectly align.

A specialized primer formulated to bond to difficult, non-porous, or glossy surfaces, providing a suitable base for subsequent paint coats.

• Essential when painting over glossy finishes, ceramic tile, or laminates.
• Creates a 'bridge' for new paint to adhere, preventing peeling.
• Often requires light sanding of the glossy surface for optimal performance.

Memory trick: To make new paint stick to gloss, ROUGHEN and PRIME like a boss.

A classification indicating a material's surface burning characteristics, specifically its Flame Spread Index (FSI) of 0-25 and Smoke Developed Index (SDI) of 0-450, as determined by the 'Steiner Tunnel Test'.

• Class A is the highest fire rating for surface burning characteristics.
• FSI measures the rate at which flame spreads across a material's surface.
• SDI measures the amount of smoke produced by a burning material.

Memory trick: ASTM E84 means FSI and SDI, for Class A, B, or C.

The critical requirement for a smooth, flat subfloor, often achieved with a self-leveling underlayment, to prevent imperfections from showing through thin, flexible resilient sheet flooring.

• Prevents telegraphing
• Achieved with SLU
• Crucial for thin materials

Memory trick: For a 'smooth resilient floor', 'level' the subfloor first, so no bumps 'telegraph' through.

A durable, multi-layered wall finish consisting of a vinyl surface laminated to a fabric or paper backing, designed for high-traffic commercial and institutional environments.

• Excellent durability against abrasion, impact, and tearing.
• Easy to clean and maintain, often scrubbable.
• Available in a wide range of patterns, textures, and colors.

Memory trick: Vinyl's tough skin in busy halls, protects against impact and falls.

Practices and procedures to prevent injuries when moving and installing heavy construction materials, emphasizing proper lifting techniques, mechanical aids, and team lifting.

• Musculoskeletal disorders (MSDs) are the most common injuries.
• Utilize dollies, carts, forklifts, or cranes whenever possible.
• If manual lifting is necessary, use proper body mechanics and team lift.

Memory trick: Heavy stone, don't lift alone, protect your back, make it known.

A flexible layer applied to a substrate beneath tile setting material to prevent water penetration and to absorb minor substrate movement, thereby preventing cracks in the tile and grout.

• Essential for wet areas like showers, bathrooms, and commercial kitchens.
• Protects substrate from moisture damage.
• Mitigates stress from substrate movement, reducing tile cracking.

Memory trick: Shower needs 'Crack-Water' membrane for no leaks, no breaks.

A fire-resistant type of gypsum board containing special additives, usually fiberglass, in its core to enhance its resistance to fire, typically used in fire-rated wall and ceiling assemblies.

• Fire-rated
• Contains fiberglass
• For rated assemblies

Memory trick: For a 'fire-rated wall', choose 'Type X' gypsum board, it's got that 'extra' fire protection.

The first layer of a multi-coat plaster system, applied directly to the lath or substrate, designed to provide strong adhesion for subsequent coats.

• Creates a 'mechanical key' (rough surface) for the brown coat to grip.
• Helps equalize and control the suction (absorption) of the substrate.
• Essential for preventing delamination and cracking of the plaster system.

Memory trick: The BOND coat is the KEY that GRIPS the wall, preventing cracks.

The process of readying the surface (lath, masonry, concrete) to receive plaster, focusing on ensuring proper cleanliness, moisture content, and bond-enhancing conditions.

• Cleanliness removes bond inhibitors (dust, grease, loose material).
• Wetting controls the suction rate of the substrate, preventing rapid water loss from plaster.
• Proper preparation is critical for preventing delamination, cracking, and premature drying.

Memory trick: Clean, wet, and ready - for plaster's bond, steady.

A type of primer formulated with alkyd resins, known for its excellent adhesion and penetration, especially on challenging surfaces like chalking or peeling paint.

• Good for chalky surfaces
• Excellent penetration
• Provides strong adhesion for topcoats

Memory trick: Chalky wood needs a strong 'Alkyd' bond to keep the paint from flaking off.

A single-number rating representing the average amount of sound energy a material absorbs across a range of frequencies (250 Hz, 500 Hz, 1000 Hz, and 2000 Hz).

• Ranges from 0.00 (perfect reflection) to 1.00 (perfect absorption).
• Higher NRC values indicate better sound absorption.
• Influenced by material thickness, density, and porosity.

Memory trick: NRC is about THICKNESS and DENSITY, making sound disappear into the void.

A material, typically lime, added to plaster mixes to enhance their plasticity, workability, and elasticity, thereby improving application and reducing cracking.

• Increases plasticity
• Improves workability
• Reduces cracking

Memory trick: To make plaster 'workable' and 'smooth', add 'Lime' like a dash of 'magic'.

A resilient flooring material made from natural or synthetic rubber, known for its durability, elasticity, slip resistance, and sound absorption properties.

• Excellent for high-traffic areas, gyms, healthcare, and educational facilities.
• Available in sheets, tiles, and various textures/colors.
• Often contains recycled content and can be specified with low VOC emissions.

Memory trick: Lobby's heavy steps need rubber's resilient, green embrace.

A bolting installation method that uses a washer-like device with protrusions that flatten as the bolt is tensioned, providing a direct visual or tactile indication that the specified clamping force has been achieved.

• Directly measures bolt tension, not torque.
• Provides a highly reliable and verifiable method for critical connections.
• Commonly used with high-strength bolts (e.g., A325, A490) in structural steel.

Memory trick: Tension Bolts: Directly Indicate Tightness.

A Welding Procedure Specification (WPS) that meets all the requirements of AWS D1.1 and has been demonstrated through extensive prior testing and experience to reliably produce sound welds, thus not requiring additional procedure qualification testing.

• Listed in AWS D1.1 for common processes (SMAW, GMAW, FCAW, SAW).
• Saves time and cost by eliminating procedure qualification testing.
• Requires strict adherence to specified parameters and materials.
• Does not eliminate the need for welder performance qualification (WPQ).

Memory trick: WPS Qualified: Pre-Tested, Proven, Saves Pennies.

Non-permanent structural elements installed during the erection of steel frames to provide stability against lateral loads and prevent collapse until the permanent bracing system is fully installed and functional.

• Crucial for safety during the construction phase.
• Must be designed to resist anticipated erection loads and wind.
• Removed once the structure achieves its full stability.

Memory trick: Brace Temporarily: Block Blows, Build Safely.

Ropes (typically non-conductive) attached to a suspended load during lifting operations, used by ground personnel to control the load's orientation, prevent rotation, and guide it into position.

• Enhance safety by preventing uncontrolled load movement.
• Allow precise positioning of heavy or awkward loads.
• Should be non-conductive if working near power lines.

Memory trick: Tag Lines: Take A Grip, Guide, Guard.

A bolted structural steel connection designed to resist relative movement (slip) between connected members under service loads by relying on the friction developed from highly pretensioned bolts.

• Requires high-strength bolts (A325, A490).
• Bolts must be tightened to a specified minimum pretension.
• Faying surfaces must be clean, unpainted, and have a specified coefficient of friction.
• Primary load transfer is through friction, not bearing.

Memory trick: Friction's Key: Pretension, Clean Surfaces, Strong Bolts.

The practice of ensuring a steel structure remains stable and safe from collapse during the construction phase, typically through temporary bracing and careful sequencing.

• Critical for preventing progressive collapse during construction.
• Includes temporary guy wires, shores, and bracing.
• Must account for construction loads, wind, and seismic forces.

Memory trick: Erect Safely: Plan, Brace, Connect, Inspect.

The ability of a pre-assembled steel component (e.g., truss, girder) to maintain its intended shape and structural integrity under its own weight and handling forces during lifting and erection.

• Achieved through properly designed and executed connections (welds, bolts).
• Crucial for safe and efficient erection.
• Prevents deformation, buckling, or failure during transport and lifting.

Memory trick: Rigid Assembly: Ready Connections, Resists Rips.

A computer numerically controlled (CNC) thermal cutting process that uses a high-velocity jet of ionized gas (plasma) to cut through electrically conductive materials like steel.

• Offers high cutting speed and good accuracy.
• Computer control ensures excellent repeatability and efficiency.
• Suitable for a wide range of steel thicknesses and complex shapes.

Memory trick: Plates Cut: Plasma's Power, Precision's Perfect.

A method of inspecting high-strength bolted connections by measuring the remaining gap in a DTI washer with a feeler gauge to confirm that the specified bolt tension has been achieved.

• DTIs provide a direct and verifiable measure of bolt tension.
• The gap measurement criteria are specified by the DTI manufacturer and project requirements.
• An approved method by AISC for quality assurance.

Memory trick: Tension Check: DTI Gap, Directly Guarantees.

Fasteners that drill their own pilot hole, tap their own threads, and are often paired with a synthetic rubber washer (EPDM) to provide a weather-tight seal and vibration resistance.

• Combine drilling, tapping, and fastening into one operation.
• EPDM washers are durable and resistant to UV and temperature extremes.
• Widely used for metal roofing, siding, and other sheet metal applications.

Memory trick: Roof Screws: Drill, Seal, Stay Firm.

Methods used to apply fire protection materials (e.g., intumescent paints, cementitious sprays) to structural steel to enhance its fire resistance, chosen based on material, scale, and desired finish.

• Intumescent coatings expand when heated, forming an insulating char.
• Cementitious fireproofing provides a thick, non-combustible layer.
• Spray application is common for speed and uniformity on large projects.
• Thickness and uniformity are critical for performance.

Memory trick: Fireproof Fast: Spray for Speed and Spread.

The process of joining stainless steel, requiring careful selection of welding process, filler metal, and shielding gas to preserve its corrosion resistance, mechanical properties, and aesthetic finish.

• Common processes: GTAW (TIG) for precision/aesthetics, GMAW (MIG) for speed.
• Filler metal must match base metal's grade and corrosion resistance.
• Shielding gas prevents oxidation and maintains chromium content.
• Heat input control is crucial to prevent carbide precipitation (sensitization).

Memory trick: Stainless Weld: Match, Shield, Control Heat.

Bolts, such as ASTM A325 and A490, used in structural steel connections to achieve high tensile strength and slip resistance, critical for robust structural integrity.

• ASTM A325: Common high-strength bolt for structural steel.
• ASTM A490: Higher strength than A325, used for more demanding applications.
• Essential for slip-critical connections where movement must be prevented.

Memory trick: Always Pick Strong Bolts for Critical Connections.

The process of creating detailed shop drawings and erection plans for structural steel, translating the structural engineer's design into practical instructions for fabrication and field assembly.

• Produces shop drawings for individual members and erection drawings for assembly.
• Includes all dimensions, connection details, bolt patterns, and welding symbols.
• Requires close coordination with engineers, fabricators, and erectors.

Memory trick: Detailers Draw Everything for Fab and Erection.

Fasteners specifically designed for thin steel members, often prioritizing speed of installation and appropriate shear/tensile strength for non-structural or light structural applications.

• Self-drilling, self-tapping (SDS) screws are most common.
• Also includes crimping, blind rivets, and some specialized bolts.
• Selection depends on load, material thickness, and installation efficiency.

Memory trick: Light Gauge Needs Self-Drilling Screws, Quickly.

Methods of cutting metal using heat to melt or vaporize the material, including oxy-fuel, plasma, and laser cutting, chosen based on material, thickness, and required precision.

• Oxy-fuel: Uses oxygen and fuel gas; good for thick carbon steel.
• Plasma Arc Cutting (PAC): Uses ionized gas; high speed, precision, versatile.
• Laser Cutting: Highest precision, minimal heat affect zone, for thinner materials.

Memory trick: Cut Steel: Thermal, Mechanical, Precision Counts.

A thermal cutting process that uses a highly focused, high-power laser beam to melt, burn, or vaporize material, producing very precise cuts with a small heat-affected zone.

• Offers superior precision and intricate cutting capabilities.
• Produces a very narrow kerf and minimal distortion.
• Can cut a wide range of metal thicknesses, with capabilities growing.

Memory trick: Cutting Steel: Laser's Light, Precision's Might.

An electrochemical process that occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte (e.g., moisture), causing the more anodic metal (aluminum) to corrode preferentially.

• Aluminum is anodic to steel, meaning it will corrode when in contact.
• Moisture acts as an electrolyte, accelerating the corrosion process.
• Prevention methods include electrical isolation, barrier coatings, or sacrificial anodes.

Memory trick: Aluminum and Steel: Electrically Separate or Suffer.

Closed structural steel shapes (squares, rectangles, rounds) used in construction, offering high strength-to-weight ratios, excellent torsional stiffness, and resistance to local buckling.

• ASTM A500 is a common specification for cold-formed HSS.
• Efficient for columns, truss members, and architectural exposed structures.
• Superior resistance to local buckling and torsion due to closed shape.
• Connections can sometimes be more complex than for open sections.

Memory trick: HSS: Closed Shape, Stronger Against Buckling.

Failure modes in light gauge steel connections where the fastener either pulls completely out of the sheet or the sheet material around the fastener hole tears, due to insufficient material thickness or strength.

• Directly related to the thinness of the light gauge steel.
• Requires careful selection of fastener type, diameter, and edge distances.
• Can be mitigated by using larger diameter fasteners, washers, or specific screw thread designs.

Memory trick: Light Gauge: Thin Sheet, Tight Fit, No Tear.

The ability to manage the molten metal during welding, crucial for achieving proper penetration, bead shape, and preventing defects like sag or undercut, often adjusted by heat input parameters.

• Excessive fluidity leads to sag, undercut, and poor bead shape.
• Arc length, current, voltage, and travel speed are key control parameters.
• Too much heat input causes excessive fluidity; too little causes lack of fusion.

Memory trick: Heat In: Control Arc, Current, Speed, Voltage.