California CSLB C-29 Masonry Examination

According to ASTM C90 standards for load-bearing concrete masonry units, what is the minimum required average net area compressive strength for individual units?

• A2000 psi average net area compressive strength
• B1500 psi average net area compressive strength
• C2500 psi average net area compressive strength
• D3000 psi average net area compressive strength

A contractor is estimating 8-inch concrete masonry units for a straight wall measuring 60 feet long by 10 feet high. Factoring in a 5% waste allowance, how many standard 8x8x16 nominal CMUs are needed?

• A675 units required for project completion
• B709 units required for project completion
• C743 units required for project completion
• D780 units required for project completion

Which ASTM C270 mortar type provides high lateral strength and is specifically recommended for reinforced masonry structures below grade subject to high earth pressures?

• AType O high-durability proportioned mortar
• BType N general-purpose exterior mortar
• CType S structural high-lateral mortar
• DType M maximum-compressive mortar mix

On an architectural site drawing drawn to a scale of 1/4 inch = 1 foot 0 inches, what actual wall length is represented by a dimension line measuring 8.5 inches?

• A21.25 feet total actual wall length
• B25.50 feet total actual wall length
• C29.75 feet total actual wall length
• D34.00 feet total actual wall length

A masonry takeoff estimates that laying 1,000 standard CMU blocks requires approximately 35 cubic feet of mortar. If one pre-blended bag yields 0.75 cubic feet of mixed mortar, how many bags are required?

• A47 bags of pre-blended masonry mix
• B52 bags of pre-blended masonry mix
• C58 bags of pre-blended masonry mix
• D64 bags of pre-blended masonry mix

According to TMS 602 standards, what is the maximum allowable variation from true vertical (plumb) for a load-bearing masonry wall up to 20 feet high?

• A1/4 inch maximum allowable deviation
• B1/2 inch maximum allowable deviation
• C3/4 inch maximum allowable deviation
• D1.0 inch maximum allowable deviation

Which ASTM standard specification governs hydrated lime used for masonry mortar purposes to ensure proper plasticity and water retention in mortar batches?

• AASTM C144 aggregate specifications
• BASTM C150 portland cement standard
• CASTM C207 hydrated lime standard
• DASTM C476 masonry grout standard

A reinforced 8-inch CMU retaining wall measures 40 feet long and 8 feet high. If the wall is fully grouted and requires 0.36 cubic feet of grout per block, what volume of grout is needed (without waste)?

• A3.60 cubic yards total grout volume
• B4.00 cubic yards total grout volume
• C4.40 cubic yards total grout volume
• D4.80 cubic yards total grout volume

Under ASTM C270 proportion specifications, what is the required volume ratio of damp loose sand to cementitious materials (portland cement + lime) for field-mixed mortar?

• A2.25 to 3.00 times the cementitious volume
• B3.25 to 4.00 times the cementitious volume
• C4.25 to 5.00 times the cementitious volume
• D5.25 to 6.00 times the cementitious volume

A contractor estimates a 2-man masonry crew (1 mason and 1 tender) can lay 240 CMUs per 8-hour day. If the mason costs $65/hr and the tender costs $40/hr, what is the labor cost per CMU?

• A$2.75 per CMU unit placed
• B$3.50 per CMU unit placed
• C$4.25 per CMU unit placed
• D$5.00 per CMU unit placed

According to TMS 402 structural design provisions, what is the minimum lap splice length for #5 (0.625 inch diameter) grade 60 deformed rebar in a reinforced CMU wall when specified as 48 bar diameters?

• A24 inches minimum lap splice length
• B27 inches minimum lap splice length
• C30 inches minimum lap splice length
• D36 inches minimum lap splice length

How many standard modular clay bricks (nominal 4x2-2/3x8 inches) are required to build a single-wythe brick veneer wall measuring 25 feet long by 12 feet high, assuming 7 bricks per square foot?

• A1,750 standard modular clay bricks
• B1,850 standard modular clay bricks
• C1,950 standard modular clay bricks
• D2,100 standard modular clay bricks

What is the specified minimum 28-day compressive strength of masonry grout according to ASTM C476 and CBC Chapter 21, unless a higher strength is specified by the structural engineer?

• A2000 psi 28-day compressive strength
• B2500 psi 28-day compressive strength
• C3000 psi 28-day compressive strength
• D3500 psi 28-day compressive strength

During a plan review for a commercial masonry building, a discrepancy is discovered between the structural notes and project specifications regarding mortar type. Which document typically governs?

• AArchitectural elevation sheets govern
• BWritten project specifications govern
• CGeneral contract summary notes govern
• DMaterial manufacturer literature governs

Under ASTM C140 test procedures, how is the linear shrinkage and total water absorption of concrete masonry units evaluated prior to delivery on site?

• AAir drying in jobsite shade racks
• BSubmerging in cold lime solution
• COven drying to a constant weight
• DVacuum sealing in plastic sheets

According to CBC Chapter 18 guidelines for masonry footings, what minimum distance must the bottom of an unreinforced concrete footing extend below the established ground surface?

• A6 inches below ground surface
• B8 inches below ground surface
• C10 inches below ground surface
• D12 inches below ground surface

According to Cal/OSHA Construction Safety Orders §1541.1, at what minimum excavation depth must a protective shoring, sloping, or benching system be installed to prevent cave-ins?

• A5 feet minimum excavation depth
• B6 feet minimum excavation depth
• C7 feet minimum excavation depth
• D8 feet minimum excavation depth

According to ACI 318 and CBC Chapter 19/21, what is the minimum required concrete cover over reinforcing steel when concrete for a masonry footing is cast directly against unformed earth?

• A2 inches minimum concrete cover
• B3 inches minimum concrete cover
• C4 inches minimum concrete cover
• D5 inches minimum concrete cover

What is the primary operational purpose of establishing corner leads or utilizing story poles prior to laying field masonry units on a wall installation?

• ASecuring temporary wall bracing
• BSupporting vertical grout pumps
• CEstablishing plumb course lines
• DAnchoring flashing membranes

Under TMS 602 §3.3 cold weather requirements, when ambient temperature falls below 40°F (4.4°C), what specific job site preparation measure must be implemented for water and aggregates?

• AStore aggregates in direct sun
• BAdd calcium chloride accelerant
• CIncrease cement ratio by 25 percent only
• DHeat mixing water and sand aggregate

What minimum relative compaction level (ASTM D1557 modified Proctor) is typically required for engineered soil subgrade beneath load-bearing masonry footings?

• A95 percent relative compaction
• B90 percent relative compaction
• C85 percent relative compaction
• D80 percent relative compaction

How should bagged masonry cement, hydrated lime, and clay brick units be stored on a job site to comply with TMS 602 site preparation standards?

• APlaced directly on compact earth
• BElevated on pallets with covers
• CStacked against exterior walls
• DSubmerged in water storage tubs

According to standard masonry industry guidelines (NCMA TEK 10-2C), what is the maximum recommended spacing for vertical control joints in an unreinforced CMU wall?

• A15 feet maximum joint spacing
• B20 feet maximum joint spacing
• C25 feet maximum joint spacing
• D30 feet maximum joint spacing

When preparing a job site for a 6-foot concrete masonry retaining wall, what subsurface drainage component is essential directly behind the heel of the wall footing?

• ADense clay backfill compaction layer
• BContinuous expansion joint material
• CSolid PVC outlet pipe without holes
• DPerforated drain pipe in gravel bed

Under TMS 602 §3.4 hot weather provisions, when ambient air temperature exceeds 90°F (32.2°C) with wind speeds over 8 mph, what field practice protects mortar from premature drying?

• AMaintain mortar board shade protection
• BMix mortar in 2-cubic-yard batches
• CAdd extra lime to extend setting time only
• DApply liquid retarder to sand piles

What is the maximum allowable horizontal deviation for vertical rebar dowels projecting from a concrete footing into hollow CMU cells according to TMS 602?

• A1/4 inch maximum horizontal tolerance
• B1/2 inch maximum horizontal tolerance
• C3/4 inch maximum horizontal tolerance
• D1.0 inch maximum horizontal tolerance

Why must masonry sand piles on a job site be covered with protective tarps during rainy weather prior to mortar mixing operations?

• APrevents sand from cooling down
• BPrevents sand from changing color
• CPrevents moisture content shifts
• DPrevents loss of sharp sand edges

When preparing CMU walls for high-lift grouting operations (lifts over 5 feet), what size cleanout opening must be provided at the base of every grouted cell?

• A2x2 inch minimum bottom opening
• B2x3 inch minimum bottom opening
• C3x3 inch minimum bottom opening
• D3x4 inch minimum bottom opening

When transferring wall layout control points from footing level to upper stories on a structural masonry building, which instrument provides the highest precision alignment?

• AOptical transit or total station laser
• BStandard 48-inch mason spirit level only
• CBraided nylon mason chalk line reel
• DStandard 100-foot fiberglass tape

When installing concrete slabs adjacent to exterior masonry stem walls, what minimum thickness polyethylene vapor retarder is specified beneath the slab under CBC Chapter 19?

• A6 mil minimum sheet thickness
• B10 mil minimum sheet thickness
• C15 mil minimum sheet thickness
• D20 mil minimum sheet thickness

How long after initial mixing may masonry mortar be retempered with water to restore workability before it must be discarded under TMS 602 standards?

• A1.0 hour from initial mixing time
• B1.5 hours from initial mixing time
• C2.0 hours from initial mixing time
• D2.5 hours from initial mixing time

When constructing a concrete masonry wall in stack bond pattern, what additional structural reinforcement is required by TMS 402 to compensate for the loss of web overlap?

• AVertical rebar in every fourth cell
• BSolid grout fills in all CMU webs
• CHeavy timber ties at top plate lines
• DContinuous joint rebar at 16 inches

Which joint tooling profile provides the highest resistance to water penetration and weather exposure in exterior load-bearing unit masonry walls?

• AConcave joint profile tooled wet
• BRaked joint profile cut deep
• CFlush joint profile left flat
• DStruck joint profile slanted in too

What is the maximum lift height for low-lift grouting operations without cleanout openings under TMS 602 grout placement specifications?

• A4.0 feet maximum grout lift height
• B5.0 feet maximum grout lift height
• C6.0 feet maximum grout lift height
• D8.0 feet maximum grout lift height

When repairing mortar joints (tuckpointing) on historic soft clay brick masonry, why is high-strength Type M portland cement mortar strictly prohibited?

• AType M mortar causes color fading
• BType M mortar shrinks excessively
• CType M mortar damages soft brick
• DType M mortar slows setting times

What is the primary structural function of horizontal continuous bond beams installed at floor and roof levels in load-bearing CMU buildings?

• AElevating overall wall course heights
• BPreventing efflorescence growth
• CFacilitating low-lift grout pumping
• DDistributing lateral seismic loads

According to CBC Chapter 21, what is the minimum required bearing length for a precast concrete or steel lintel on solid masonry supporting wall ends?

• A4 inches minimum bearing length
• B6 inches minimum bearing length
• C8 inches minimum bearing length
• D10 inches minimum bearing length

What primary chemical compound forms white powdery efflorescence on exterior masonry walls, and what is the proper initial cleaning method?

• ACalcium silicate; scrub with muriatic acid
• BSoluble salts; scrub with water and brush
• CSodium hydroxide; coat with oil sealer
• DIron oxide; blast with high-pressure sand

Why must masonry grout placed in deep CMU cores be consolidated with a mechanical vibrator and then reconsolidated approximately 15 minutes later?

• AEliminates sand aggregate separation
• BSpeeds up initial cement hydration
• CRelieves water loss void settlement
• DIncreases final grout color density

Under TMS 602 laying standards, why is the practice of "slushing" (filling head joints with loose mortar after units are set) strictly prohibited?

• AIncreases mortar drying shrinkage
• BCauses severe mortar discoloration
• CWeakens horizontal bond beam bars
• DFails to create full mortar bond

What is the maximum allowable wall surface area served by a single adjustable metal wall tie connecting two wythes of a cavity wall under TMS 402?

• A1.77 sq ft maximum wall area per tie
• B2.67 sq ft maximum wall area per tie
• C3.50 sq ft maximum wall area per tie
• D4.50 sq ft maximum wall area per tie

What is the standard nominal mortar bed joint thickness for CMU wall construction, and what is the maximum allowable field variation under TMS 602?

• A1/4 inch nominal; plus/minus 1/16 inch
• B3/8 inch nominal; plus/minus 1/8 inch
• C1/2 inch nominal; plus/minus 3/16 inch
• D5/8 inch nominal; plus/minus 1/4 inch

When replacing a cracked load-bearing CMU unit in an existing wall, how deep must old mortar be raked back around the adjacent units before setting the replacement block?

• A1/4 inch minimum mortar depth
• B1/2 inch minimum mortar depth
• CFull bed depth to clean shell
• DSurface wire brushing only

Under CBC Chapter 21 structural provisions, what is the maximum unreinforced parapet wall height allowed relative to its nominal wall thickness?

• A1.5 times nominal wall thickness
• B2.0 times nominal wall thickness
• C2.5 times nominal wall thickness
• D3.0 times nominal wall thickness

What is the key distinction between control joints in concrete masonry (CMU) walls and expansion joints in clay brick masonry walls?

• ACMU contracts; clay brick expands
• BCMU expands; clay brick contracts
• CCMU stays fixed; clay brick sags
• DCMU shifts sideways; brick moves up

According to CBC Chapter 21 and TMS 402, what is the maximum allowable surface area for a single exterior glass unit masonry panel exposed to standard wind loads?

• A100 sq ft maximum panel area
• B144 sq ft maximum panel area
• C180 sq ft maximum panel area
• D250 sq ft maximum panel area

What resilient expansion joint material must be installed at the head and jambs of an exterior glass block panel to accommodate thermal movement?

• ARigid Portland cement mortar bed only
• BPreformed asphaltic fiber filler
• CExpansion strip of polyethylene foam
• DSolid oak wood shim strip filler