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NCCER Masonry practice questions

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Question 1Masonry knowledge assessment

In a running bond wall, the vertical joints of one course align with what feature of the course below?

  1. The vertical joints of the course below
  2. The bed joint of the course above
  3. The centers of the units below Correct answer.
  4. The wall ties in the cavity

Explanation

Running bond offsets each course by half a unit, so head joints land over the middle of the units in the course beneath. This half-unit offset is what gives running bond its characteristic staggered appearance and spreads vertical load across the wall.

Question 2Masonry knowledge assessment

Which mortar joint profile is generally recommended for exterior walls because it sheds water well?

  1. Struck
  2. Flush
  3. Concave Correct answer.
  4. Raked

Explanation

A concave joint is tooled with a jointer that compacts the mortar against the unit edges and forms a curved surface that drains water away. It is dense and tight, which makes it the preferred profile for exterior exposure.

Question 3Masonry knowledge assessment

What is the standard nominal face dimension of a modular brick?

  1. 2 1/4 in by 8 in
  2. 2 1/4 in by 7 5/8 in
  3. 2 2/3 in by 8 in Correct answer.
  4. 3 5/8 in by 8 in

Explanation

A modular brick has a nominal face of 2 2/3 in high by 8 in long, including the mortar joint. Those nominal dimensions let modular units combine into modules of 4 in and 8 in, simplifying layout.

Question 4Masonry knowledge assessment

Why must masonry units be laid with the frog, if present, facing upward?

  1. So the frog is visible for final inspection
  2. So the mortar bed can fill and key into the depression Correct answer.
  3. So the frog aligns with the head joints
  4. So the unit weighs less during placement

Explanation

Placing the frog up lets the bed joint mortar press into the recess, forming a mechanical key that locks the unit to the mortar. Facing the frog down would create a void under the unit and reduce bond.

Question 5Masonry knowledge assessment

A mason needs a mortar that will be used within about 24 hours and is not exposed to sulfate attack. Which cement type is the common choice for general masonry mortar?

  1. Type III Portland cement
  2. Type V Portland cement
  3. Type S Portland cement Correct answer.
  4. Type I Portland cement

Explanation

Type S cement is formulated for masonry mortar and provides good workability and moderate sulfate resistance. It is the common general-purpose choice for masonry mortar in ordinary exposure.

Question 6Masonry knowledge assessment

What is the purpose of flashing in a masonry wall?

  1. To bond the facing wythe to the backup
  2. To provide a decorative band at the wall base
  3. To reinforce the bed joint against settlement
  4. To direct water that enters the wall to the exterior Correct answer.

Explanation

Flashing is an impervious material installed at intersections, openings, and the base of a wall to intercept water and lead it out through weep holes. Without flashing, moisture trapped inside the wall can migrate inward and damage the interior.

Question 7Masonry knowledge assessment

Which tool is used to strike a mortar joint to a concave profile?

  1. A brick hammer
  2. A trowel
  3. A pointing trowel
  4. A jointer or slicker Correct answer.

Explanation

A jointer, also called a slicker, has a rounded face that compresses and shapes the mortar into a concave profile. Tooling with it tightens the joint surface and improves weather resistance.

Question 8Masonry knowledge assessment

What does the term "wythe" refer to in a masonry wall?

  1. The cavity between two wall faces
  2. A continuous vertical layer of masonry one unit thick Correct answer.
  3. A horizontal course of units at the wall base
  4. The mortar joint between two courses

Explanation

A wythe is a continuous vertical layer of masonry units, typically one unit thick. A solid wall may have one wythe, while a cavity wall has an outer and inner wythe separated by a space.

Question 9Masonry knowledge assessment

A mason is laying a wall in cold weather and the ambient temperature is falling toward freezing. What is the primary concern for the mortar?

  1. Mortar should be mixed with extra water to slow setting
  2. Mortar should be placed in thicker beds to retain heat
  3. Mortar joints should be left raked to drain
  4. Mortar must be protected from freezing until it gains sufficient strength Correct answer.

Explanation

Fresh mortar that freezes before it sets loses strength and bond, so cold-weather work requires heated materials, enclosures, or other protection. The mortar must be kept above freezing until it has cured enough to resist damage.

Question 10Masonry knowledge assessment

When laying brick to a line, what is the purpose of the line blocks and the mason's line?

  1. To measure the mortar joint thickness only
  2. To keep each course straight, level, and at the correct height Correct answer.
  3. To hold the wall ties in position
  4. To support the scaffold planks

Explanation

Line blocks anchor a taut line at the correct offset from the wall face, and the mason lays each unit to that line. This controls alignment, level, and course height across the length of the wall.

Question 11Masonry knowledge assessment

A mason must build a corner first so that the rest of the wall can be laid to a line. What is this corner called?

  1. A lead Correct answer.
  2. A quoin
  3. A pilaster
  4. A pier

Explanation

A lead is a corner or section built ahead of the main wall to establish line and level for the courses that follow. Building leads at corners and openings lets the mason stretch a line between them for accurate infill.

Question 12Masonry knowledge assessment

What is the main function of a wall tie in a cavity wall?

  1. To transfer lateral loads and tie the wythes together Correct answer.
  2. To seal the cavity against air infiltration
  3. To carry the vertical load of the outer wythe to the foundation
  4. To reinforce the mortar bed against shrinkage

Explanation

Wall ties connect the outer and inner wythes so they act together to resist lateral loads such as wind. They are spaced according to code and must be installed with the correct embedment and slope.

Question 13Masonry knowledge assessment

A mason is mixing Type N mortar and the mix becomes stiff after standing on the board. What is the correct practice?

  1. Add water and remix to restore workability within the allowed time Correct answer.
  2. Discard it immediately regardless of elapsed time
  3. Add cement to stiffen it further
  4. Add sand to dry it out

Explanation

Mortar that stiffens from standing may be tempered by adding water and remixing, provided it is still within the permitted working time. Mortar that has begun to set must not be retempered, because its strength and bond are already compromised.

Question 14Masonry knowledge assessment

Why are weep holes installed at the base of a cavity wall above the flashing?

  1. To allow water collected on the flashing to drain out Correct answer.
  2. To provide ventilation for the cavity insulation
  3. To anchor the flashing to the wall
  4. To allow mortar droppings to escape during construction

Explanation

Weep holes are open joints or tubes that let water sitting on the flashing drain to the exterior. Keeping them clear is essential, since blocked weep holes allow water to rise and enter the building.

Question 15Masonry knowledge assessment

A mason is estimating the number of concrete masonry units needed for a wall. The standard nominal face of a concrete block is 8 in high by 16 in long. Approximately how many blocks are required per 100 square feet of wall?

  1. 225
  2. 112 Correct answer.
  3. 150
  4. 75

Explanation

A nominal 8 in by 16 in block covers 128 sq in, or about 0.889 sq ft, including the mortar joint. Dividing 100 sq ft by 0.889 sq ft per block gives about 112 blocks per 100 sq ft.

Question 16Masonry knowledge assessment

Which statement best describes the difference between a stack bond and a running bond?

  1. Stack bond aligns head joints vertically, while running bond offsets them Correct answer.
  2. Stack bond offsets head joints, while running bond aligns them
  3. Stack bond uses no mortar, while running bond uses mortar
  4. Stack bond is used only for veneer, while running bond is used only for structural walls

Explanation

In stack bond every head joint lines up from course to course, so the wall relies on reinforcement for lateral strength. Running bond staggers the head joints by half a unit, which distributes load and improves resistance to cracking.

Question 17Masonry knowledge assessment

A mason must cut a brick to fit at the end of a course. What is the standard practice for the cut unit in the wall?

  1. Place the cut edge on the exposed face for a clean appearance
  2. Use the cut piece only in the bed joint
  3. Discard all cut pieces and adjust the bond instead
  4. Place the cut edge toward the interior of the wall where possible Correct answer.

Explanation

Cut faces are rougher and less weather-resistant than manufactured faces, so the cut edge is normally turned inward or into a concealed location. This keeps the exposed face intact and improves durability and appearance.

Question 18Masonry knowledge assessment

What is the purpose of a shelf angle in a veneer wall that rises several stories?

  1. To reinforce the backup wall against wind
  2. To tie the veneer to the backup at each floor
  3. To support the veneer at intervals so its weight is not carried entirely by the base Correct answer.
  4. To provide a flashing ledge at window heads

Explanation

A steel shelf angle is anchored to the structural backup and carries the veneer at each support level. This limits the height of veneer bearing on the base and accommodates differential movement between the veneer and the structure.

Question 19Masonry knowledge assessment

A mason is laying a wall and notices that the mortar is setting too quickly in hot, windy conditions. Which action best addresses this?

  1. Lay longer mortar beds so less time is spent per unit
  2. Wet the units excessively so they slump into place
  3. Add more cement to speed placement
  4. Keep the units and mortar shaded and avoid spreading mortar ahead of placement Correct answer.

Explanation

Hot, dry, windy weather draws water from the mortar and shortens its working life. Shading materials and limiting the spread of mortar to what can be placed promptly keeps the mortar workable and preserves bond.

Question 20Masonry knowledge assessment

In masonry, the term "efflorescence" refers to which condition?

  1. A bulge caused by inadequate lateral support
  2. A hairline crack along a bed joint
  3. A dark stain from embedded wall ties
  4. A white powdery deposit of water-soluble salts on the wall surface Correct answer.

Explanation

Efflorescence forms when water-soluble salts migrate to the surface and crystallize as the water evaporates. It is usually a cosmetic symptom of moisture movement rather than a structural defect, though persistent cases point to a water source.

Question 21Masonry knowledge assessment

A mason is building a wall with a control joint. What is the primary purpose of that joint?

  1. To separate two different mortar types
  2. To allow for movement and relieve stresses that would otherwise crack the masonry Correct answer.
  3. To create a decorative vertical line
  4. To provide a bond break between the wythes

Explanation

Control joints are deliberately weakened vertical planes that let the wall move and relieve tensile stress from shrinkage and temperature change. They are located where cracking is most likely and must be detailed to remain weathertight.

Question 22Masonry knowledge assessment

A mason is checking a completed wall for plumb. Which tool is the standard choice for checking the vertical alignment of a tall wall section?

  1. A spirit level held against the wall face Correct answer.
  2. A folding rule laid on the bed joint
  3. A chalk line snapped on the wall
  4. A line level stretched across the wall

Explanation

A spirit level, often a long mason's level, is held vertically against the wall face and checked in both directions to verify plumb. Long levels or levels used with a straightedge reveal deviations over the full height of the work.

Question 23Masonry knowledge assessment

Which mortar type provides the highest compressive strength among the common masonry mortar types?

  1. Type S
  2. Type N
  3. Type O
  4. Type M Correct answer.

Explanation

Type M mortar has the highest cement content and the highest compressive strength of the common types. It is used for heavy-load and severe-exposure applications where high strength is required.

Question 24Masonry knowledge assessment

A masonry wall shows a stair-step crack following the mortar joints near a corner. Which condition most likely explains this pattern?

  1. Use of a concave joint profile on the exterior
  2. Improper frog orientation in the units
  3. Differential settlement of the foundation beneath that corner Correct answer.
  4. Efflorescence migrating through the wall

Explanation

Stair-step cracking that follows head and bed joints near a corner typically signals movement, most often differential settlement of the supporting foundation. The crack steps through the joints because mortar is the weaker path through the masonry.

Question 25Masonry knowledge assessment

A mason must lay a wall in a location where the masonry will be exposed to severe sulfate attack in soil and groundwater. Which mortar cement type is most appropriate?

  1. Type III
  2. Type V Correct answer.
  3. Type II
  4. Type I

Explanation

Type V cement is manufactured for high sulfate resistance and is specified where masonry is exposed to severe sulfate concentrations. Using it in these conditions reduces the risk of sulfate-driven expansion and deterioration.

Question 26Masonry knowledge assessment

Which masonry unit is manufactured from clay or shale and fired in a kiln?

  1. Gypsum partition tile
  2. Concrete block
  3. Brick Correct answer.
  4. Cast stone

Explanation

Brick is a fired clay or shale product; the raw material is shaped and then burned in a kiln, which gives it its hardness and color. Concrete block and cast stone are cementitious products that cure rather than fire, and gypsum tile is a sulfate-based interior product.

Question 27Masonry knowledge assessment

In masonry terminology, what does the bed joint describe?

  1. The horizontal mortar layer on which a unit is laid Correct answer.
  2. The sealant joint at a window frame
  3. The recessed joint at an external corner
  4. The vertical joint between two units in the same course

Explanation

The bed joint is the horizontal bed of mortar that a masonry unit is set into, and its thickness and fullness control the wall's compressive behavior. Vertical joints between units in the same course are head joints, not bed joints.

Question 28Masonry knowledge assessment

A mason needs to level a long concrete block wall course by course. Which tool is placed on top of the units to check that the course is horizontal?

  1. Chalk line
  2. Spirit level Correct answer.
  3. Tuck pointer
  4. Folding rule

Explanation

A spirit level (mason's level) contains vials that show when a surface is horizontal or vertical, so it is set on the units to check each course for level and for plumb on the face. A chalk line marks a straight reference but does not itself measure level.

Question 29Masonry knowledge assessment

Which term describes the vertical distance from the top of one masonry course to the top of the next course?

  1. Bond length
  2. Course height Correct answer.
  3. Nominal size
  4. Wythe thickness

Explanation

Course height is the repeated vertical module of a wall, equal to the unit height plus one bed joint, and it governs coursing and sill and lintel elevations. Nominal size and bond length describe unit dimensions and horizontal spacing, not vertical repeat.

Question 30Masonry knowledge assessment

Which mortar ingredient is added to improve workability and water retention, especially in a mix with high sand content?

  1. Clean sand
  2. Portland cement
  3. Potable water
  4. Hydrated lime Correct answer.

Explanation

Hydrated lime plasticizes the mortar, improves workability, and helps the mix hold water so it does not stiffen too fast on the board. Cement is the primary binder, sand is the aggregate, and water is the vehicle; none of those supplies the plasticizing function.

Question 31Masonry knowledge assessment

What is the standard thickness of a typical mortar joint in brickwork?

  1. 3/4 inch
  2. 1/8 inch
  3. 1 inch
  4. 3/8 inch Correct answer.

Explanation

Brick masonry bed and head joints are conventionally about 3/8 inch thick, which combines with the unit dimensions to produce the nominal coursing module. Joints much thinner cannot accommodate unit tolerances, and joints much thicker weaken the wall in compression.

Question 32Masonry knowledge assessment

Which type of bond is produced by laying each course with a half-unit offset so that head joints are staggered?

  1. English bond
  2. Running bond Correct answer.
  3. Stack bond
  4. Flemish bond

Explanation

Running bond offsets each course by half a unit, so vertical head joints in one course fall at the middle of the units below, which avoids continuous vertical joints. Stack bond aligns head joints directly, while Flemish and English bonds alternate headers and stretchers within the same course.

Question 33Masonry knowledge assessment

What does the compressive strength class of a mortar primarily describe?

  1. Its ability to carry load in compression Correct answer.
  2. Its color match after curing
  3. Its resistance to freeze-thaw damage
  4. Its resistance to sulfate attack

Explanation

Mortar types are classified largely by compressive strength, which reflects how much load the hardened mortar can carry. Durability properties such as freeze-thaw and sulfate resistance are separate considerations influenced by cement type and exposure.

Question 34Masonry knowledge assessment

A mason is laying a long straight wall of concrete block and wants to keep the face of the wall in a true vertical plane. Which tool is used to check the face for plumb?

  1. Mason's level Correct answer.
  2. Joint raker
  3. Brick hammer
  4. Folding rule

Explanation

A mason's level has a vertical vial that reads plumb when the tool is held against the face or end of the wall, so it is the standard instrument for checking vertical alignment. The other tools listed do not contain a plumb vial.

Question 35Masonry knowledge assessment

A mason is building a wall in an area where the masonry will be exposed to severe sulfate attack in soil and groundwater. Which cement type should the mortar be specified with?

  1. Type III
  2. Type V Correct answer.
  3. Type I
  4. Type II

Explanation

Type V portland cement is formulated for high sulfate resistance and is specified where the soil or groundwater contains high sulfate concentrations. Type I is general purpose, Type II offers moderate sulfate resistance, and Type III is a high-early-strength cement.

Question 36Masonry knowledge assessment

A mason is installing a masonry wall that must resist lateral wind load and needs the masonry tied back to the structural frame. Which element is used to connect the masonry to the backup?

  1. Weep hole
  2. Flashing
  3. Corrugated wall tie Correct answer.
  4. Control joint

Explanation

Wall ties are metal connectors embedded in the mortar and anchored to the backup so lateral loads are transferred between the masonry and the structure. Weep holes, flashing, and control joints serve water drainage and movement accommodation, not structural connection.

Question 37Masonry knowledge assessment

A mason is laying a brick wall and must provide a level starting course around the entire perimeter. Which procedure is standard?

  1. Start at each corner independently without a common reference
  2. Establish a level line around the foundation and lay the first course to that line Correct answer.
  3. Lay the first course directly on the footing without checking level
  4. Lay the first course in stack bond to simplify alignment

Explanation

The first course must be laid to a level line established around the foundation so that all subsequent courses remain level and the wall meets at the corners correctly. Starting corners independently without a common reference causes the courses to drift out of level.

Question 38Masonry knowledge assessment

A mason is building a cavity wall and must ensure that water draining down the cavity does not collect at the base. Which detail accomplishes this?

  1. Sealing the base of the cavity with mortar
  2. Omitting weep holes to keep wind out
  3. Filling the cavity with grout to the base
  4. Installing flashing sloped to weep holes at the base Correct answer.

Explanation

Flashing at the base of the cavity collects water and slopes it toward weep holes so it can exit the wall. Sealing the base or filling the cavity traps water, and omitting weep holes prevents drainage entirely.

Question 39Masonry knowledge assessment

A mason is laying a wall in hot, dry weather and the units are absorbing water from the mortar rapidly. Which practice best preserves mortar workability?

  1. Use a drier mix so less water is available to be absorbed
  2. Add extra water to the mortar on the board after it stiffens
  3. Wet the units before laying so they do not draw water from the mortar Correct answer.
  4. Lay the units without any mortar and grout the joints later

Explanation

Pre-wetting absorptive units reduces the rate at which they pull water from the mortar, so the mortar stays workable and develops proper bond. Re-tempering stiffened mortar with water or using an overly dry mix harms strength and bond.

Question 40Masonry knowledge assessment

A mason is building a brick wall and must place a header course. What is the purpose of the header units in the wall?

  1. To create a location for weep holes
  2. To provide decorative color variation only
  3. To reduce the number of mortar joints
  4. To tie the wythes or leaves of the wall together Correct answer.

Explanation

Headers are units laid across the wall thickness so they bond the leaves together and distribute load across the wall. Their structural tie function is the reason header courses appear in traditional bond patterns.

Question 41Masonry knowledge assessment

A mason must cut a concrete block to fit a short space at the end of a course. Which practice is standard for the cut unit?

  1. Use the cut piece as small as needed with no minimum size
  2. Fill the space with mortar only
  3. Use a half block regardless of the space
  4. Cut the unit so the piece is at least one-quarter of the full length Correct answer.

Explanation

Cut units should not be smaller than about one-quarter of the full unit length; smaller pieces are weak and difficult to bond properly. Using a half block when the space is smaller, or filling with mortar, produces poor workmanship.

Question 42Masonry knowledge assessment

A mason is building a multi-story veneer wall and must support the veneer above an opening. Which element carries the veneer load at that location?

  1. Weep hole
  2. Wall tie
  3. Shelf angle Correct answer.
  4. Control joint

Explanation

A shelf angle is a steel angle anchored to the structural frame that carries the weight of the veneer above an opening or at each floor line. Wall ties resist lateral loads but are not designed to carry vertical veneer weight.

Question 43Masonry knowledge assessment

A mason notices that a finished wall shows a white, powdery deposit on the surface. Which condition does this describe?

  1. Honeycombing
  2. Crazing
  3. Efflorescence Correct answer.
  4. Spalling

Explanation

Efflorescence is a white, powdery salt deposit that forms when water carries salts to the surface and evaporates. Spalling is flaking of the surface, crazing is fine surface cracking, and honeycombing is voids from incomplete consolidation.

Question 44Masonry knowledge assessment

A mason is laying a brick wall and wants to ensure that the mortar bonds well to the units. Which practice is most important?

  1. Leaving the head joints unfilled to allow drainage
  2. Laying the unit dry and pointing the joint afterward
  3. Using a very dry mortar so it does not squeeze out
  4. Buttering the unit and pressing it into place so mortar fills the joint Correct answer.

Explanation

Proper bond requires that the unit be buttered with mortar and pressed into place so the mortar spreads and fills both bed and head joints. Dry units, overly dry mortar, and unfilled head joints all prevent the mortar from bonding to the unit surface.

Question 45Masonry knowledge assessment

A mason is building a wall and must ensure that the mortar is mixed to the specified proportions. Which statement best describes the role of the mortar in the wall?

  1. It carries the entire compressive load of the wall
  2. It provides the decorative finish only
  3. It prevents all movement of the wall
  4. It bonds the units together and accommodates minor variations in unit size Correct answer.

Explanation

Mortar bonds the units into a composite assembly and its joints take up small differences in unit dimensions so courses stay level and plumb. The units themselves carry most of the compressive load, and mortar does not prevent movement.

Question 46Masonry knowledge assessment

A mason is installing a masonry wall with a brick veneer over a wood-frame backup. Which detail best prevents water that enters the cavity from reaching the interior?

  1. Omitting the flashing at the base
  2. A continuous water-resistive barrier over the backup with flashing at the base Correct answer.
  3. Sealing the weep holes
  4. Filling the cavity with mortar

Explanation

The water-resistive barrier sheds water that passes the veneer, and flashing at the base directs it to weep holes so it exits the wall. Filling the cavity, sealing weep holes, or omitting flashing traps water against the backup.

Question 47Masonry knowledge assessment

A masonry wall shows a stair-step crack following the mortar joints near a corner. Which condition most likely explains the crack?

  1. Excessive mortar strength in the joints
  2. Differential settlement of the foundation beneath the corner Correct answer.
  3. Presence of weep holes at the base
  4. Use of a running bond pattern

Explanation

Stair-step cracking along mortar joints near a corner is a classic sign of differential foundation settlement, which concentrates movement at the corner and opens the joints in a stepped pattern. Mortar strength, bond pattern, and weep holes do not produce this crack pattern.

Question 48Masonry knowledge assessment

A mason is laying a wall with a specified mortar type and the inspector notes that the mortar is being re-tempered with water hours after mixing. Why is this practice a problem?

  1. It weakens the hardened mortar and reduces bond Correct answer.
  2. It changes the color of the mortar only
  3. It increases the compressive strength of the mortar
  4. It restores workability without affecting strength

Explanation

Mortar that has begun to set cannot be restored by adding water; re-tempering after the initial set weakens the hardened mortar and reduces its bond to the units. The correct practice is to discard mortar that has stiffened beyond its working life.

Question 49Masonry knowledge assessment

A mason is building a wall that will be exposed to freeze-thaw cycles in a saturated condition. Which mortar selection is most appropriate?

  1. A mortar with the maximum sand content and minimum cement
  2. A mortar with good durability and appropriate air content for the exposure Correct answer.
  3. A high-strength mortar with the highest cement content available
  4. A mortar mixed with the least possible water

Explanation

In freeze-thaw exposure, mortar must be durable, and air entrainment improves resistance to damage from freezing water in the pores. Simply maximizing cement content or minimizing water does not provide the needed durability, and excess sand reduces bond and strength.

Question 50Masonry knowledge assessment

A mason is asked to build a masonry wall that must resist lateral loads from wind and also accommodate movement without random cracking. Which combination of elements best satisfies both requirements?

  1. Wall ties anchored to the backup plus control joints at proper spacing Correct answer.
  2. Header courses plus a running bond pattern
  3. Shelf angles plus a stack bond pattern
  4. Weep holes plus flashing at the base

Explanation

Wall ties transfer lateral wind loads from the masonry to the structural backup, while control joints at appropriate spacing allow the wall to move and relieve stresses that would otherwise cause random cracking. Drainage and bond pattern elements do not address both requirements.