Arizona ROC B/B-3/CR-61 General Residential, Remodeling and Carpentry Examination

A residential building site plan specifies a finished floor elevation (FFE) of 1,250.50 ft. The existing ground elevation at the building pad is 1,248.00 ft. The combined thickness of the crushed aggregate base and concrete slab is 1.00 ft. What is the required depth of fill needed to bring the subgrade to proper elevation before placing aggregate base?

• A1.50 feet of fill
• B2.50 feet of fill
• C1.00 foot of fill
• D2.00 feet of fill

When setting up batter boards to lay out a rectangular foundation using the 3-4-5 right triangle method, if one leg measured along the building line is 12 feet and the perpendicular leg is 16 feet, what must the diagonal distance measure to ensure a true 90-degree corner?

• A18 feet
• B20 feet
• C24 feet
• D25 feet

Per IRC R401.4 and standard geotechnical specifications, engineered fill placed under building footings and structural slabs-on-grade must be compacted to what minimum percentage of Maximum Dry Density (MDD) as determined by the Modified Proctor test (ASTM D1557)?

• A85% Modified Proctor density
• B90% Modified Proctor density
• C95% Modified Proctor density
• D100% Modified Proctor density

Per IRC R401.3, what is the minimum required slope for finish grade away from residential foundation walls, and over what minimum horizontal distance must this fall occur (unless paved or constrained)?

• A2 inches of fall in the first 5 feet
• B4 inches of fall in the first 8 feet
• C12 inches of fall in the first 10 feet
• D6 inches of fall in the first 10 feet

A excavation contractor is digging a continuous footing trench with a total perimeter length of 120 feet, a width of 2.0 feet, and a depth of 1.5 feet. If the excavated soil experiences a swell factor of 15%, what is the total volume of loose soil that must be hauled off-site in cubic yards?

• A15.33 cubic yards
• B13.33 cubic yards
• C17.25 cubic yards
• D20.00 cubic yards

When preparing a subgrade over unstable expansive clay soils, what is the primary structural function of installing a woven geotextile fabric beneath the aggregate base layer?

• ATo act as a complete waterproof membrane prohibiting subsoil moisture migration
• BTo separate aggregate base from soft subgrade soil and prevent intermixing while providin…
• CTo serve as a chemical termiticide barrier beneath interior concrete floor slabs
• DTo accelerate frost heave underneath exterior concrete driveway slabs

According to IRC R405.1, when installing a perimeter foundation drainage system (French drain) around basement or retaining walls, how must the perforated drain pipe be installed relative to footings and filter material?

• ADirectly on bare soil 12 inches above the footing with holes facing upward
• BEncased in solid concrete below the invert level of the sewer main
• COn a bed of washed gravel or crushed stone at or below footing level, with perforations f…
• DVertically against the foundation wall extending to finish surface grade

What is the standard installation requirement for trenching and toeing-in a silt fence fabric to control site sediment runoff during earth disturbing activities?

• ALay the fabric flat on top of ground vegetation without stakes
• BAttach fabric to stakes placed 15 feet apart with top edge touching ground
• CStaple fabric to wooden posts set flush with finish floor level
• DDig a 6-inch deep trench, embed the bottom fabric flap horizontally into the trench, back…

Per IRC R403.1.8, when building on expansive soils with a plasticity index (PI) of 15 or greater, which specialized foundation system design is typically required unless traditional footings are designed by a registered design professional?

• APost-tensioned slab-on-grade or deep continuous stem wall extending below moisture zone
• BUnreinforced shallow gravel trench footings without concrete
• CPrecast hollow core plank floor supported on unanchored wooden posts
• DStandard 6-inch thick unreinforced concrete patio slab

Under Arizona Underground Facilities Law (Arizona Blue Stake / 811), what is the minimum hand-digging safety clearance zone distance required on either side of marked underground utility lines before power excavating equipment can be used?

• A12 inches
• B24 inches
• C36 inches
• D48 inches

Per IRC R403.1.4, what is the absolute minimum depth below undisturbed ground surface that concrete footings must extend in frost-susceptible regions (or to the local frost line depth)?

• A6 inches
• B8 inches
• C12 inches
• D18 inches

A 2-story residential load-bearing wall transmits a uniform total load of 2,400 pounds per linear foot (plf) to a continuous concrete footing. If the soil bearing capacity is 1,500 pounds per square foot (psf), what is the minimum required width of the continuous footing in inches?

• A12 inches
• B16 inches
• C18 inches
• D20 inches

When backfilling a concrete masonry retaining wall, why must coarse aggregate drain rock be placed immediately behind the wall with weep holes installed along the base?

• ATo relieve hydrostatic water pressure that would otherwise cause wall tipping or structur…
• BTo increase soil compaction density above 100% Modified Proctor
• CTo prevent tree roots from penetrating exterior masonry joints
• DTo eliminate the need for mortar between masonry courses

A surveyor sets an optical transit level. The story pole reading at a known benchmark elevation of 100.00 ft is 4.50 ft. If the target subgrade elevation is 98.00 ft, what should the grade rod reading measure at the target subgrade?

• A2.50 feet
• B6.50 feet
• C7.50 feet
• D8.50 feet

Per OSHA 1926 Subpart P Table B-1, what is the maximum allowable slope angle (Horizontal:Vertical ratio) for an un-shored excavation trench up to 20 feet deep in Type B soil?

• A3/4 : 1 (53 degrees)
• B1 : 1 (45 degrees)
• C1-1/2 : 1 (34 degrees)
• D1/2 : 1 (63 degrees)

Per IRC R506.2.2, what is the minimum required thickness of washed gravel or crushed stone aggregate base placed underneath a residential floor slab to function as a capillary moisture break?

• A1 inch
• B2 inches
• C3 inches
• D4 inches

In Arizona residential construction, pre-construction subterranean termite treatment applied beneath concrete floor slabs must comply with state regulations by performing which step prior to pouring concrete?

• AApplying registered liquid termiticide uniformly to subgrade soil and covering with vapor…
• BSoaking the finished concrete slab with water for 7 consecutive days
• CSprinkling dry lime over top of the vapor retarder membrane
• DMixing termiticide powder directly into ready-mix concrete trucks at the batch plant

According to ASTM C143 standard test method for slump of hydraulic-cement concrete, how many equal-volume layers of fresh concrete must be filled into the slump cone, and how many times must each layer be rodded?

• A2 layers, rodded 20 times per layer
• B3 layers, rodded 25 times per layer
• C4 layers, rodded 30 times per layer
• D5 layers, rodded 15 times per layer

Per ASTM C39 compressive strength testing of cylindrical concrete specimens, at what standard curing age is specified compressive strength (f'c) officially evaluated to verify contract design compliance?

• A3 days
• B7 days
• C28 days
• D90 days

Calculate the total volume of concrete in cubic yards required for a rectangular slab-on-grade measuring 40 feet long, 30 feet wide, and 5 inches thick, assuming a 10% waste and spillage factor.

• A16.5 cubic yards
• B18.5 cubic yards
• C19.2 cubic yards
• D20.4 cubic yards

Per ACI 318 and IRC R404.1.2.3, what is the minimum concrete clear cover required for reinforcing steel bars in footings cast directly against and permanently exposed to earth?

• A3 inches
• B2 inches
• C1-1/2 inches
• D3/4 inch

When splicing #4 (1/2-inch diameter) steel rebar in residential foundation footings, what is the standard lap splice length required per standard trade practice (30 bar diameters)?

• A8 inches
• B15 inches
• C24 inches
• D36 inches

Per IRC R403.1.6, anchor bolts connecting wood sill plates to concrete stem walls must be at least 1/2 inch in diameter, embedded a minimum of 7 inches, spaced maximum 6 feet o.c., and located within what distance from each end of any plate section?

• AWithin 6 inches of ends and min 2 inches from ends
• BWithin 18 inches of ends and min 6 inches from ends
• CWithin 12 inches of ends and min 4 inches from ends
• DWithin 24 inches of ends and min 12 inches from ends

What is the primary chemical or physical purpose of incorporating air-entraining admixtures into fresh concrete mix designs for exterior slabs in freeze-thaw climates?

• ATo increase dry concrete density above 160 lbs/cu ft
• BTo accelerate initial set time during hot weather pours
• CTo eliminate all void spaces and achieve 100% solid compaction
• DTo create billions of microscopic air bubbles that relieve internal hydraulic expansion p…

Per ACI 302.1R, what is the required minimum saw-cut depth and maximum recommended spacing for control joints (contraction joints) in a 4-inch thick unreinforced concrete slab-on-grade?

• AMinimum 1 inch depth (1/4 slab thickness) spaced maximum 8 to 10 feet apart
• BMinimum 2 inches depth (1/2 slab thickness) spaced maximum 15 to 20 feet apart
• CMinimum 1/2 inch depth (1/8 slab thickness) spaced maximum 25 feet apart
• DMinimum 3 inches depth (3/4 slab thickness) spaced maximum 5 feet apart

Per ACI 306R Cold Weather Concreting guidelines, concrete placement should be protected from freezing when the average daily ambient temperature drops below 40°F, and fresh concrete temperature must be maintained above what minimum temperature during curing?

• A32°F
• B50°F
• C70°F
• D85°F

During hot weather concrete placement in Arizona summer conditions (ACI 305R), fresh concrete temperature at time of delivery should not exceed what maximum temperature to prevent rapid slump loss and thermal cracking?

• A75°F
• B80°F
• C90°F
• D105°F

Per IRC R506.2.3, what is the minimum required thickness of a polyethylene vapor retarder placed below conditioned space interior concrete floor slabs, and how far must sheet joints overlap?

• A2-mil thickness, lapped 2 inches
• B4-mil thickness, lapped 4 inches
• C6-mil thickness, lapped 4 inches
• D6-mil thickness, lapped 6 inches

Per ACI 308, standard moist curing or liquid membrane-forming curing compound application on fresh concrete slabs should be maintained continuously for at least how many days?

• A7 days
• B14 days
• C21 days
• D28 days

A continuous perimeter footing measuring 50 ft by 30 ft requires 2 continuous horizontal lines of #5 steel rebar around the entire perimeter. If #5 rebar weighs 1.043 lbs per linear foot, and an extra 10% length is added for lap splices and corner hooks, what is the total weight of rebar required?

• A333.8 lbs
• B367.1 lbs
• C400.5 lbs
• D450.0 lbs

Why is it critical that concrete finishing operations (such as floating and steel troweling) are NOT performed while bleed water is still standing on the surface of the slab?

• ABleed water accelerates concrete setting time prematurely
• BFinishing bleed water into the surface weakens the top layer, causing scaling, dusting, a…
• CBleed water increases compressive strength above design limits
• DTroweling bleed water turns concrete into an acidic hazardous chemical

In residential post-tensioned slab-on-grade construction, at what minimum concrete compressive strength are high-strength steel tendons typically stressed per Post-Tensioning Institute (PTI) specifications?

• A1,000 psi
• B1,500 psi
• C1,800 psi
• D2,000 psi

Per IRC Table R403.1(1), for a 2-story light-frame house built on soil with a bearing capacity of 1,500 psf, what is the minimum required footing width and minimum footing thickness?

• A15 inches wide by 6 inches thick
• B12 inches wide by 4 inches thick
• C24 inches wide by 12 inches thick
• D30 inches wide by 8 inches thick

Where should welded wire reinforcement (WWR 6x6-W1.4/W1.4) be placed within a 4-inch concrete slab to effectively control shrinkage and temperature cracking?

• ADirectly on subgrade earth under the vapor barrier
• BIn the top one-third of slab thickness supported on chairs or dobies
• CFlush with the bottom surface of the slab touching gravel
• DFloating loosely on top of fresh concrete during troweling

What are the exact actual dimensions of a standard nominal 8 in x 8 in x 16 in concrete masonry unit (CMU)?

• A8 in x 8 in x 16 in
• B7-1/4 in x 7-1/4 in x 15-1/4 in
• C7-5/8 in x 7-5/8 in x 15-5/8 in
• D7-1/2 in x 7-1/2 in x 15-1/2 in

Per ASTM C270, which mortar type offers high flexural bond strength and is specifically recommended for exterior load-bearing concrete masonry walls below grade or subject to severe lateral wind/seismic loads?

• AType O mortar
• BType N mortar
• CType K mortar
• DType S mortar

Calculate the total number of standard 8x8x16 CMU blocks required to construct a foundation wall 40 feet long and 8 feet high, including a 5% waste factor. (Note: standard CMU coverage is 1.125 blocks per sq ft).

• A378 blocks
• B360 blocks
• C396 blocks
• D420 blocks

Per TMS 602 / IRC R606, what is the maximum vertical spacing permitted for continuous horizontal joint reinforcement (ladder or truss wire) in reinforced masonry wall construction?

• A8 inches o.c.
• B16 inches o.c.
• C24 inches o.c.
• D32 inches o.c.

Per TMS 602 grout placement standards, low-lift grouting without special inspection or cleanouts is limited to what maximum grout pour height in a single lift?

• A4 feet 0 inches
• B5 feet 4 inches
• C8 feet 0 inches
• D12 feet 0 inches

Where should vertical expansion or control joints be located in long straight concrete masonry walls to prevent stress concentration and uncontrolled cracking?

• AOnly at the bottom footing corner joints
• BEvery 5 feet along solid un-windowed walls
• CAt maximum 50-foot intervals
• DAt changes in wall height or thickness, near wall intersections, and at maximum 20 to 25…

What structural masonry element is constructed along the top of a CMU wall or below floor ledger connections to tie the wall together and distribute concentrated overhead loads?

• ABond beam
• BPilaster cap
• CExpansion joint
• DWeep hole lintel

Per TMS 602 cold weather masonry requirements, when ambient temperature drops below 40°F during construction, what precaution must be taken regarding mortar mixing water and materials?

• AAdd antifreeze windshield washer fluid to mortar mix water
• BHeat mixing water and/or sand so mortar is produced between 40°F and 120°F and protect co…
• CDouble the proportion of hydrated lime in mortar
• DEliminate mortar completely and dry-stack units with adhesive

Per IRC R606.10, what is the minimum bearing length of a steel or precast concrete lintel resting on CMU jambs on each side of a door or window opening up to 6 feet wide?

• A2 inches
• B3 inches
• C4 inches
• D8 inches

In standard cold-formed steel framing member designations (such as 362S125-33), what does the number '33' represent?

• A33 ksi yield strength
• B3.3 inches overall flange depth
• C33% total recycled steel content
• D33 mil minimum steel thickness (20 gauge structural)

When fastening cold-formed steel bottom runner tracks to a concrete floor slab, what is the maximum recommended fastener spacing per AISI standards and standard industry practice?

• A24 inches o.c., and within 2 to 3 inches of track ends
• B48 inches o.c., and within 12 inches of track ends
• C12 inches o.c. along the center line only
• D6 inches o.c. staggered along both flanges