CSLB C-39 Roofing (Trade Exam) — All Questions

Which standard covers coal-tar pitch used in roofing?

• a.ASTM D312
• b.ASTM D41
• c.ASTM D450✓
• d.ASTM D6083

Coal tar used in roofing is listed under ASTM D450, Type I or II. D312 is roofing asphalt, D41 asphalt primer and D6083 acrylic coating.2025 CRC Table R905.9.2

Which tests does the CRC list for the wind resistance of single-ply roofing?

• a.ASTM E108, E119 or E1592
• b.ASTM D7158, D3161 or D3462
• c.FM 4474, UL 580 or UL 1897✓
• d.UL 2703, UL 7103 or UL 790

Single-ply roofing is tested to FM 4474, UL 580 or UL 1897. D7158 and D3161 are shingle wind tests, and E108 and UL 790 are fire tests.2025 CRC R905.12.4

What is the minimum number of fasteners for an individual (non-strip) asphalt shingle?

• a.Two✓
• b.Four
• c.One
• d.Six

The CRC requires at least the manufacturer's number of fasteners, but not less than four per strip shingle or two per individual shingle.2025 CRC R905.2.6

What minimum head diameter must an asphalt shingle roofing nail have?

• a.3/8 inch✓
• b.5/16 inch
• c.1/2 inch
• d.1/4 inch

Asphalt shingle nails need a minimum 3/8-inch-diameter head and a 12-gage shank. The 5/16-inch head is the tile nail minimum.2025 CRC R905.2.5

What minimum shank size must an asphalt shingle roofing nail have?

• a.12-gage✓
• b.18-gage
• c.14-gage
• d.16-gage

Asphalt shingle fasteners need at least a 12-gage [0.105 inch] shank. The 11-gage figure is the minimum for tile nails.2025 CRC R905.2.5

To which standard must asphalt shingles comply under the CRC?

• a.ASTM D226
• b.ASTM C406
• c.ASTM D3462✓
• d.ASTM D3909

Asphalt shingles comply with ASTM D3462. D226 is felt underlayment, D3909 mineral-surfaced roll roofing and C406 slate.2025 CRC R905.2.4

Concrete tile is installed at 3:12. What underlayment application is required?

• a.Double underlayment✓
• b.A single layer lapped 2 inches
• c.Self-adhered membrane at the eaves only
• d.No underlayment

For tile slopes from 2-1/2:12 to 4:12, double underlayment application is required. A single layer lapped 2 inches is the method at 4:12 and steeper.2025 CRC R905.3.2

In an area designated for ice barriers, which building does NOT need one?

• a.A two-story house
• b.A house with a 12:12 roof
• c.A detached unheated shed✓
• d.A heated garage attached to a house

The ice barrier requirement has an exception for detached accessory structures not containing conditioned floor area.2025 CRC R905.1.2 exception

Step flashing is installed where shingles meet a wall covered with lap siding. Where does the flashing's vertical leg go?

• a.On top of the siding, sealed
• b.Behind the sheathing
• c.Cut off at the siding's bottom edge
• d.Continuous under the siding✓

Where siding is provided on the vertical sidewall, the vertical leg of the sidewall flashing must be continuous under the siding.2025 CRC R905.2.8.3

What is the minimum thickness of corrosion-resistant metal cap flashing on an asphalt shingle roof?

• a.0.032 inch
• b.0.019 inch✓
• c.0.010 inch
• d.0.0125 inch

Cap flashing must be corrosion-resistant metal of minimum nominal 0.019-inch thickness, the same minimum as metal base flashing.2025 CRC R905.2.8.1

When must valley linings be installed on an asphalt shingle roof?

• a.After the shingles, as a cover
• b.Before the shingles✓
• c.Only on slopes below 4:12
• d.Only when the valley is closed

Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles.2025 CRC R905.2.8.2

Which copper valley lining meets the CRC table for asphalt shingle open valleys?

• a.Copper-colored paint on steel
• b.Copper foil tape
• c.16 oz cold-rolled copper✓
• d.8 oz copper sheet

The table lists cold-rolled copper of 0.0216 inch nominal, ASTM B370, 16 oz per square foot (and high-yield copper at 12 oz).2025 CRC Table R905.2.8.2

What minimum height must the splash diverter rib on clay tile valley flashing have?

• a.2 inches
• b.3/4 inch
• c.1/2 inch
• d.1 inch✓

Tile valley flashing extends at least 11 inches each way and has a splash diverter rib at least 1 inch high. The 3/4-inch rib is the metal roof shingle rule.2025 CRC R905.3.9

What minimum head size must a nail for clay or concrete tile have?

• a.5/16 inch✓
• b.3/8 inch
• c.1/4 inch
• d.1/2 inch

Tile nails must be at least 11-gage with a 5/16-inch head. The 3/8-inch head is the asphalt shingle rule.2025 CRC R905.3.7

Concrete tile is installed in an area subject to snow. How many fasteners per tile are required at minimum?

• a.One
• b.One on every other row
• c.None below 5:12
• d.Two✓

In areas subject to snow, not less than two fasteners per tile are required.2025 CRC R905.3.8

Concrete tile is laid on solid sheathing without battens at 3:12 (no snow, no wind design, tile over 9 psf). How are field tiles fastened?

• a.Two fasteners per tile
• b.One fastener per tile✓
• c.No fasteners needed below 5:12
• d.One fastener every other row

On solid sheathing without battens, the table requires one fastener per tile at all slopes. The no-fastener entry below 5:12 applies to spaced sheathing or solid sheathing with battens.2025 CRC Table R905.3.8

Which ASTM standard must roofing slate meet under the CRC?

• a.ASTM C1167
• b.ASTM D3462
• c.ASTM C1492
• d.ASTM C406✓

Slate shingles comply with ASTM C406. C1167 is clay tile, C1492 concrete tile and D3462 asphalt shingles.2025 CRC R905.6.4

What minimum metal does the CRC require for slate valley and flashing metal?

• a.Any painted steel
• b.0.0179-inch G90 steel✓
• c.0.0125-inch G60 steel
• d.0.010-inch aluminum

Slate valley and flashing metal must be a minimum uncoated thickness of 0.0179 inch, zinc-coated G90, and valley flashing at least 15 inches wide.2025 CRC R905.6.7

Slate is installed on a very steep 22:12 mansard. What minimum headlap does the table require?

• a.6 inches
• b.3 inches
• c.2 inches✓
• d.4 inches

At slopes of 20:12 and steeper the minimum slate headlap is 2 inches; 3 inches applies from 8:12 to below 20:12 and 4 inches from 4:12 to below 8:12.2025 CRC Table R905.6.6

Which rule applies to joints in wood shingle courses?

• a.Only the starter course has a joint rule
• b.Joints must line up every other course
• c.No joints aligned in any three adjacent courses✓
• d.Joints may align if they are sealed

Wood shingles are laid with a side lap of at least 1-1/2 inches between joints in courses, and no two joints may be in direct alignment in any three adjacent courses.2025 CRC R905.7.6

Which nail does the table specify for 24-inch wood shingles?

• a.4d box nails✓
• b.3d box nails
• c.8d common nails
• d.6d box nails

The table specifies 3d box nails for 16- and 18-inch shingles and 4d box nails (1-1/2 in x 0.076) for 24-inch shingles.2025 CRC Table R905.7.6(2)

What is the minimum felt used as interlayment strips between courses of wood shakes?

• a.18-inch strips of No. 30 felt✓
• b.12-inch strips of No. 15 felt
• c.Self-adhered membrane strips
• d.36-inch strips of house wrap

Shakes are interlaid with 18-inch-wide strips of not less than No. 30 felt, positioned so the felt is not exposed to the weather.2025 CRC R905.8.8

What minimum grade must naturally durable wood shakes meet?

• a.No. 3
• b.No. 1✓
• c.No. 2
• d.Any grade if labeled

The shake material table requires No. 1 grade for wood shakes of naturally durable wood under the Cedar Shake and Shingle Bureau rules.2025 CRC Table R905.8.5

What is the minimum slope for a lapped, nonsoldered-seam metal roof installed without lap sealant?

• a.1/2:12
• b.2:12
• c.3:12✓
• d.1/4:12

Lapped, nonsoldered-seam metal roofs without applied lap sealant need a 3:12 slope; with lap sealant, 1/2:12; standing seam, 1/4:12.2025 CRC R905.10.2

What minimum weight does the CRC table set for cold-rolled copper sheet roofing (not high-yield)?

• a.8 oz per sq ft
• b.16 oz per sq ft✓
• c.20 oz per sq ft
• d.12 oz per sq ft

The metal roof covering table sets ASTM B370 copper at a minimum of 16 oz/sq ft, or 12 oz/sq ft for high-yield copper.2025 CRC Table R905.10.3(1)

Where must required attic ventilation openings open?

• a.Into the garage
• b.Directly outdoors✓
• c.Into the living space
• d.Into a wall cavity

Required ventilation openings must open directly to the outside air and be protected against birds, rodents, snakes and similar creatures.2025 CRC R806.1

How does the NPS clay tile brief describe removing a single broken tile?

• a.Break it out with a hammer from above
• b.Pry up the course above with a crowbar
• c.Leave it and seal the crack
• d.Cut its nails with a ripper or hacksaw blade✓

The NPS says a broken tile should be carefully removed with a slate ripper or hacksaw blade inserted under the tile to cut the nails holding it.NPS Preservation Brief 30

Why does the NPS say slate should be laid with copper or stainless steel nails?

• a.Steel nails crack the slate when driven
• b.Stainless nails need no pre-punched holes
• c.Copper nails are cheaper
• d.Steel nails rust out first✓

The NPS explains that plain steel and galvanized nails usually rust out long before the slate begins to deteriorate, which is a common cause of slate loss.NPS Preservation Brief 29

Where must a roofing contractor's Code of Safe Practices be kept?

• a.At the job site or with supervisors✓
• b.Only in the IIPP binder at home
• c.Filed with CSLB
• d.Only at the main office

The Code of Safe Practices is posted at a conspicuous location at each job site office or provided to each supervisory employee, who keeps it readily available.Cal. Code Regs. tit. 8 §1509(c)

In what form must an employer's Injury and Illness Prevention Program exist?

• a.Oral only
• b.In writing✓
• c.No set form
• d.Posted video only

Section 3203 requires the program to be in writing. Employers with fewer than 10 employees may communicate general safe practices orally, but the program itself is written.Cal. Code Regs. tit. 8 §3203

What container does Cal/OSHA require for the first-aid kit on a construction project?

• a.A locked cabinet in the office
• b.The foreman's truck glove box
• c.Any cardboard box
• d.A weatherproof container✓

Every employer on a construction project must provide at least one first-aid kit in a weatherproof container, with contents inspected and replaced.Cal. Code Regs. tit. 8 §1512

Which describes the drinking water the heat illness standard requires?

• a.Fresh, pure, cool and free✓
• b.Bottled water only above 95°F
• c.Water only during meal breaks
• d.Any water, at cost

Employees must have access to potable water that is fresh, pure, suitably cool and provided free of charge, located as close as practicable to where they work.Cal. Code Regs. tit. 8 §3395

A roofer feels overheated at 86°F and asks to rest in the shade. What does the standard say?

• a.Allow and encourage the rest✓
• b.Allow it only with a doctor's note
• c.Deny it until 95°F
• d.Allow it only at lunch

Employees are allowed and encouraged to take a preventative cool-down rest in the shade whenever they feel the need, and are monitored for symptoms during it.Cal. Code Regs. tit. 8 §3395

Which is one of the high-heat procedures required at 95°F or above?

• a.Supplying salt tablets to all
• b.Naming who may call for help✓
• c.Stopping all work at noon
• d.Doubling the lunch break

High-heat procedures include designating one or more employees on each site as authorized to call for emergency medical services, along with communication, observation, water reminders and pre-shift meetings.Cal. Code Regs. tit. 8 §3395(e)

What is the maximum setting for the relief valve on a kettle fuel tank pressurized by pumped air?

• a.100 psi
• b.150 psi
• c.60 psi✓
• d.30 psi

The spring-loaded relief valve pops at no more than the vessel's safe working pressure, but in no case greater than 60 pounds per square inch.Cal. Code Regs. tit. 8 §1726(c)

A kettle must be moved along a public street. How must it be prepared?

• a.Drained 5 in below the splash rail✓
• b.Kept hot with the burner running
• c.Covered with a canvas tarp only
• d.Filled to the top so it cannot slosh

When a kettle is moved on any public street or roadway, it must be drained at least 5 inches below the splash rail.Cal. Code Regs. tit. 8 §1725(f)

What must happen to the burner of a kettle mounted on an elevated truck bed while the truck moves?

• a.It may stay on if the lid is closed
• b.It may stay on low
• c.It may stay on with an attendant riding
• d.It must be extinguished✓

Kettle burners must be extinguished when the truck is moving, and no riders are allowed on the elevated platform while the truck is in motion.Cal. Code Regs. tit. 8 §1727

What minimum construction does Cal/OSHA require for a hot asphalt bucket?

• a.Aluminum with a wooden handle
• b.No. 24 gauge steel, 1/4-inch bail✓
• c.Any plastic pail
• d.No. 30 gauge steel with a rope handle

Hot asphalt and pitch buckets must be No. 24 gauge or heavier sheet steel with a metal bail of 1/4-inch diameter or larger.Cal. Code Regs. tit. 8 §1729(a)

An open container other than a carrying bucket is used to move hot asphalt. How full may it be?

• a.90 percent of capacity
• b.Up to the brim if lidded
• c.Completely full
• d.75 percent of capacity✓

Carrying buckets are filled no closer than 4 inches from the top, and no other open container transporting hot asphalt or pitch may be filled beyond 75 percent of capacity.Cal. Code Regs. tit. 8 §1725(c)

Coal-tar pitch is handled in a poorly ventilated confined space. What must be readily available?

• a.Respiratory and eye protection✓
• b.Nothing beyond normal clothing
• c.Only leather gloves
• d.A two-way radio

Suitable respiratory and eye protection must be readily available to workers handling coal tar pitch in confined spaces where ventilation is inadequate.Cal. Code Regs. tit. 8 §1728(b)

How far may a worker have to travel on a construction site to reach the nearest general-purpose (2A) fire extinguisher?

• a.No more than 25 feet
• b.No more than 200 feet
• c.No more than 75 feet✓
• d.Any distance on site

A 2A extinguisher is required for each 3,000 sq ft, and travel distance to the nearest one may not exceed 75 feet.Cal. Code Regs. tit. 8 §1922(a)

A ladder is set where it could contact an unprotected energized service conductor. What ladder is required?

• a.A steel ladder
• b.A non-conductive ladder✓
• c.Any ladder with rubber feet
• d.An aluminum ladder

Non-conductive ladders must be used where the ladder or user may contact unprotected energized electrical conductors or equipment.Cal. Code Regs. tit. 8 §3276

How must an extension ladder be erected?

• a.Rung locks released for flexibility
• b.Base section on top of the fly
• c.Fly section tied beside the base
• d.Fly on top, rung locks engaged✓

Extension ladders are always erected so the fly section is above and resting on the base section with the rung locks engaged.Cal. Code Regs. tit. 8 §3276

A flat residential roof has a 36-inch parapet. How is the employee's fall height measured under Section 1731?

• a.From the top of the parapet
• b.From the work surface down✓
• c.From the ceiling below the roof
• d.From the ridge of the neighboring roof

The fall height is the vertical distance from the employee's walking/working surface to the ground or level below, and parapet height is not included.Cal. Code Regs. tit. 8 §1731(e)

A commercial shingle roof (multiple-unit) at 4:12 is 24 feet high. Which protection does Section 1730 list?

• a.No protection below 30 feet
• b.Warning lines at 5 feet only
• c.Roof jacks or a 24-inch parapet✓
• d.A safety monitor only

For multiple-unit coverings from 0:12 through 5:12 on roofs more than 20 feet high, Section 1730 requires a roof jack system, a parapet at least 24 inches high, or equivalent protection.Cal. Code Regs. tit. 8 §1730(e)

What minimum material may span between roof jacks as a plank?

• a.2 x 4 construction lumber
• b.2 x 6 selected lumber✓
• c.Plywood strips, any size
• d.1 x 6 boards

Wooden members spanning between roof jacks must be selected lumber of at least 2 x 6 material, with jacks no more than 10 feet apart.Cal. Code Regs. tit. 8 §1724(a)

What must be laid beside each crawling board as a handhold?

• a.A snapped chalk line
• b.A warning line at 5 feet
• c.A fastened 3/4-inch Manila rope✓
• d.A second crawling board

A firmly fastened line of at least 3/4-inch diameter Manila rope, or equivalent, is laid beside each crawling board for use as a handhold.Cal. Code Regs. tit. 8 §1724(b)

When does Section 1671 require safety nets?

• a.Whenever a crew requests them
• b.Only over open water
• c.At 6 feet on all roofs
• d.At 25 feet when others fail✓

Safety nets are required where the elevation is 25 feet or more and personal fall arrest, restraint, positioning or more conventional protection is clearly impractical.Cal. Code Regs. tit. 8 §1671

How far may a worker free fall on a positioning device system?

• a.No more than 2 feet✓
• b.No more than 6 feet
• c.No more than 3.5 feet
• d.No more than 10 feet

Positioning devices must be rigged so the employee cannot free fall more than 2 feet. Six feet is the personal fall arrest limit.Cal. Code Regs. tit. 8 §1670(c)

What force must a guardrail midrail withstand without failure?

• a.50 pounds
• b.200 pounds
• c.150 pounds✓
• d.500 pounds

Midrails, screens and similar members must withstand at least 150 pounds in any downward or outward direction; the top rail must withstand 200 pounds.Cal. Code Regs. tit. 8 §1620(d)