California CSLB C-47 General Manufactured Housing Examination

What initial training requirement must a C-47 contractor fulfill before obtaining authorization to perform manufactured home installations?

• ACompletion of an HCD-approved initial installer training course
• BCompletion of a 40-hour Cal/OSHA heavy equipment operator course
• CSubmission of a 100-hour residential framing apprenticeship card
• DCompletion of an EPA certified lead-safe renovator training class

A 14-foot wide single-section manufactured home has a total roof live and dead load of 40 psf. If piers are spaced at 6-foot intervals along each main chassis beam, what concentrated load must each intermediate chassis pier support?

• A840 lbs of roof load
• B1,680 lbs of roof load
• C3,360 lbs of roof load
• D5,040 lbs of roof load

When planning the installation of a manufactured home on a private lot outside a mobilehome park in California, which agency issues the installation permit?

• ACalifornia Department of Transportation Highway Division
• BContractors State License Board Enforcement Division
• CLocal City or County Building Enforcement Department
• DFederal Housing Administration Regional District Bureau

What primary technical document governs the structural setup, blocking, and tie-down locations during the installation of a new manufactured home?

• AThe generic California Residential Building Code table
• BThe local city general land use zoning ordinance map
• CThe national electrical code emergency backup section
• DThe manufacturer's DAPIA-approved installation manual

A pier block supports a concentrated load of 4,500 lbs. If the site soil has an allowable soil bearing capacity of 1,500 psf, what minimum pre-cast concrete footing pad area is required?

• A3.0 sq ft
• B2.0 sq ft
• C4.5 sq ft
• D6.0 sq ft

What must a C-47 contractor verify regarding site utility connection points before finalizing an installation cost estimate?

• AVerify utility meters are mounted inside the home crawl space
• BVerify utility locations match home utility connection outlets
• CVerify electric utilities provide three-phase 480V industrial power
• DVerify water utilities provide minimum 120 psi main pressure

Where are perimeter piers required along the exterior marriage line of a multi-section manufactured home?

• APerimeter piers are only required at the four home corners
• BPerimeter piers are only required beneath interior partition walls
• CPerimeter piers are required under load-bearing wall openings
• DPerimeter piers are required under non-structural window frames

How often must certified manufactured home installers complete continuing education requirements to maintain active certification status in California?

• AAnnually
• BEvery 5 years
• CEvery 10 years
• DEvery 3 years

When planning an installation in a California mountain zone with a roof snow load exceeding 40 psf, what structural design requirement applies?

• AThe home must be installed with DAPIA high-snow engineering plans
• BStandard 20 psf single-wide pier blocking spacing may be used
• CGround anchors are prohibited in areas prone to heavy snow accumulation
• DUnder-floor crawl space ventilation must be completely eliminated

A contractor is estimating 6-mil polyethylene ground vapor retarder material for a 28 ft x 60 ft multi-section home crawl space. Allowing 10% extra for seam overlaps, how much plastic sheeting is required?

• A1,512 sq ft
• B1,848 sq ft
• C2,156 sq ft
• D2,464 sq ft

When planning hardware takeoffs for marriage line structural attachment, what fastener type is specified by standard DAPIA details for joining floor rim joists?

• ASmooth shank 8d finish nails at 24 inches on center intervals
• BSelf-tapping drywall screws at 12 inches on center
• C3/8-inch diameter lag screws or bolts with flat washers
• D1/4-inch concrete wedge anchors through rim joists

What is the primary scope limitation of a C-47 General Manufactured Housing classification license issued by CSLB?

• AConstructing multi-story wood framing additions
• BPerforming major commercial plumbing installations
• CInstalling high-voltage utility power substations
• DLimited to manufactured homes and accessories

A 60-foot manufactured home requires diagonal ground anchors spaced at a maximum of 6 feet on center along both main chassis beams. What minimum number of diagonal anchors is required?

• A22 anchors for both sides
• B16 anchors for both sides
• C12 anchors for both sides
• D8 anchors for both sides

When estimating contract pricing, what document must a C-47 contractor provide to home purchasers before executing the purchase agreement?

• AA copy of the local municipal master traffic control plan
• BA written itemized estimate and installation disclosure
• CA certified copy of the state highway bridge load rating guide
• DA 10-year commercial property environmental impact statement

What site access dimension must a C-47 contractor verify during pre-installation job site planning for multi-section transport delivery?

• AMinimum 8-foot wide site entry gate clearance
• BMinimum 10-foot overhead tree branch clearance
• CMinimum 14 to 16-foot wide clear transport roadway
• DMinimum 25-foot turning radius at all cul-de-sacs intersections

What default allowable soil bearing capacity must be assumed for foundation pad sizing when soil testing is not conducted?

• A3,000 psf
• B2,500 psf
• C2,000 psf
• D1,500 psf

What slope requirement applies to site grading surrounding a manufactured home pad?

• ASlope away at 1/2 inch per foot for at least 10 ft
• BSlope toward at 1/4 inch per foot for at least 5 ft
• CLevel within 20 feet of home perimeter
• DSlope away at 2 inches per foot for at least 3 ft

What is the minimum required vertical clearance between the unexcavated ground surface and the bottom of the main steel chassis beams?

• A6 inches under chassis beams
• B12 inches under chassis beams
• C18 inches under chassis beams
• D24 inches under chassis beams

What pre-installation site clearing operation is required before placing concrete footing pads?

• ACompacting topsoil over organic tree roots
• BSpreading fresh wood chip mulch under pier locations
• CRemoving all organic vegetation, sod, and loose topsoil
• DFlooding the excavation pit with standing surface water

What installation standard applies to ground vapor retarders placed under manufactured homes?

• AOverlap 3 inches with loose edges
• B2-mil clear cellophane plastic
• COptional if skirting vents are non-operable
• D6-mil polyethylene overlapped 12 inches

When constructing continuous concrete footings in areas subject to freezing temperatures in California, what depth requirement applies to footings?

• AExtend below the established local frost line depth
• BPlaced flush with the top layer of organic topsoil surface
• CExcavated to a uniform depth of exactly 6 inches
• DPoured 4 inches above surrounding finish grade

Where should site utility service risers (water, gas, sewer) be located relative to the manufactured home footprint during site prep?

• ADirectly under main I-beam webs
• BWithin designated crawl space utility zones
• CCast directly inside pier footings concrete bases
• D10 feet outside property lines

What minimum thickness is required for poured-in-place concrete footing pads under federal installation standards?

• AAt least 2 inches thick
• BAt least 4 inches thick
• CAt least 6 inches thick
• DAt least 10 inches thick

A pier carries a total structural load of 3,600 lbs. If soil test data indicates an allowable soil bearing capacity of 2,000 psf, what is the minimum required footing footprint size?

• A12 x 12 inches (1.0 sq ft)
• B14 x 14 inches (1.36 sq ft)
• C16 x 16 inches (1.78 sq ft)
• D18 x 18 inches (2.25 sq ft)

What site preparation measure must be installed if high groundwater or surface runoff threatens under-floor crawl space areas?

• ASubsurface French drains or an automatic sump pump system
• BA 12-inch thick layer of loose dry cedar wood shavings
• CSealed rubber gaskets around all perimeter skirting vents
• DA continuous electrical heating cable grid across ground soil

What is the minimum required separation distance between manufactured home walls on adjacent mobilehome park lots?

• A3 feet wall-to-wall clearance
• B6 feet wall-to-wall clearance
• C10 feet wall-to-wall clearance
• D15 feet wall-to-wall clearance

When placing foundation pads on imported fill material, what compaction standard is required by site engineering guidelines?

• AMinimum 70% relative compaction
• BMinimum 80% relative compaction
• CMinimum 90% relative compaction
• DLeft uncompacted to allow natural settling

What requirement applies to crane placement pads when hoisting manufactured home modules over site obstacles?

• AOutriggers may rest directly on uncompacted topsoil
• BOutriggers must rest on asphalt roadway gutters only
• COutriggers must rest on 2-inch thick plywood sheets
• DOutriggers on firm soil with timber mats

Where must the main gas shutoff valve be located relative to the site supply riser?

• AAbove ground on the riser pipe, upstream of the flexible connector
• BInside the site riser box below ground level, accessible with a key
• CDirectly beneath the marriage line floor insulation in the crawl space
• DMounted on the exterior roof ridge beam adjacent to the chimney vent

What minimum depth below finish grade must water supply lines be buried on site to comply with California plumbing standards?

• AAt least 6 inches below grade
• BAt least 12 inches below grade
• CAt least 24 inches below grade
• DAt least 36 inches below grade

What slope requirement applies to site sewer drainage piping connecting the home drop point to the park sewer riser?

• ASloped upward at 1/8 inch per foot toward riser
• BSloped downward at 1/16 inch per foot minimum
• CSloped downward at 1/4 inch per foot minimum
• DMaintained completely level without slope

What working space clearance must be maintained around electrical service pedestals on park lots?

• A12 inches wide by 24 inches deep
• B18 inches wide by 30 inches deep
• C24 inches wide by 36 inches deep
• D30 inches wide by 36 inches deep

When constructing piers using 8x8x16 concrete masonry units under federal installation standards, how must the block cells be oriented?

• AVertically so open cores align
• BHorizontally parallel to main beams
• CDiagonally at a 45-degree angle
• DOptional if cap blocks are used

Under federal installation standards, single-open-cell block piers may be used up to what maximum pier height before double-block corner interlocking is required?

• A24 inches
• B36 inches
• C48 inches
• D60 inches

What cap block material combination is permitted on top of a concrete masonry block pier under federal installation standards?

• AA 1-inch thick fiberglass insulation pad
• BA 3/4-inch interior grade particleboard cutout
• CA 4-inch solid concrete cap or 2-inch solid hardwood cap
• DA stack of four 1/2-inch untreated soft pine shims under each beam

What rule governs the installation of wood shims placed between the cap block and the steel chassis beam?

• ASoft pine, max 2 inches total thickness
• BSingle wedges placed parallel to beam web
• CHollow plastic tiles stacked up to 3 inches high
• DHardwood, max 1 inch thick, in opposing pairs

A 16 ft x 70 ft single-wide home main beam carries 500 lbs per linear foot. If each pier has a maximum allowable capacity of 3,000 lbs, what maximum pier spacing along the main I-beam is permitted?

• A6.0 feet on center
• B8.0 feet on center
• C10.0 feet on center
• D12.0 feet on center

What primary alignment step must be completed before bolting marriage line wall studs together on a double-wide manufactured home?

• AApply exterior vinyl siding over un-clamped marriage seams without clamping
• BLevel both sections and draw marriage walls tight with clamps
• CInstall perimeter skirting to lock chassis beams in position
• DConnect site sewer drops to pull floor sections into line

According to DAPIA structural connection details, how are ridge beam marriage line connections secured in multi-section homes?

• A16d finish nails spaced 36 inches on center
• BPlastic cable ties wrapped around rafter tails
• CLag screws or steel straps per manufacturer schedules
• DExpanding polyurethane foam adhesive along entire ridge line

What weatherproofing detail must be installed along the roof marriage line seam during multi-section assembly?

• ASingle layer 15 lb felt paper over rafter edges
• BUnsealed aluminum flashing laid loose beneath ridge caps only
• CDuct tape strips applied over shingle joints
• DFoam gasket, butyl tape, membrane, and ridge cap shingles

What purpose does the marriage line floor gasket serve during multi-section home setup?

• APrevents air, moisture, and insect passage
• BActs as a structural beam supporting chassis iron
• CReplaces lag screw fasteners at rim joists
• DRaises crawl space floor height by 3 inches

When connecting under-floor crossover heating ducts between home sections, what attachment method is required?

• ADuct tape wrapped over bare insulation
• BSheet metal collars, draw bands, foil tape, and vapor barrier
• CFriction fit flex duct over plastic sewer pipe sections without sealing
• DWire staples through flex duct inner core

How must electrical crossover circuits between multi-section home units be enclosed under California Electrical Code?

• ATwisted open wire splices left exposed under floor insulation
• BWire splices with wire nuts inside accessible junction boxes
• CSolderless crimps wrapped in cloth friction tape in crawl space
• DLow-voltage bell wire run through open skirting louvers

What requirement applies to ABS drain-waste-vent crossover piping connections under multi-section manufactured home floors?

• AJoined with threaded hose clamps
• BJoined with un-glued slip couplings and no mechanical fasteners
• CJoined with duct tape bands
• DSolvent welded or approved shielded couplings

When installing ground anchors, at what angle should diagonal tie-down anchors be driven into the earth?

• AAligned with the tie strap angle or use stabilizer plates
• BPerfectly vertical at 90 degrees to ground
• CHorizontally under concrete pier pads
• D15 degrees inward toward the home center axis on every tie-down strap

How are diagonal tie-down straps attached to the main steel chassis beams of a manufactured home?

• AStapled through bottom board wrap into floor joists
• BWrapped around main beam with approved frame clamps
• CTied in square knots around axle spring hangers
• DTack-welded with 6010 electrodes to beam flanges

Under state seismic tie-down standards, what primary purpose do longitudinal ground anchors serve?

• APrevent vertical roof uplift in heavy snow
• BPrevent floor joist sagging between piers
• CResist end-to-end horizontal home movement
• DSupport weight of perimeter skirting panels