CSLB C-39 Roofing (Trade Exam) — All Questions
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33 questions
Under the Fire Code, where must the attendant of an operating asphalt kettle be?
- a.Within 100 feet, in sight✓
- b.Anywhere on the roof above it
- c.Inside the truck cab
- d.Within 500 feet by radio
An operating kettle must be attended by at least one knowledgeable employee within 100 feet who has the kettle within sight, with no ladder in the route.2025 CFC 303.4
What is the maximum capacity of a hi-boy used to carry hot asphalt on a roof?
- a.100 gallons
- b.55 gallons✓
- c.20 gallons
- d.9-1/2 gallons
The Fire Code limits hi-boys to 55 gallons, requires noncombustible construction, and allows no heat source as part of a hi-boy.2025 CFC 303.7
A crew wants to tow a kettle to the next job with the burner running to save heating time. What does the Fire Code say?
- a.Allowed if the lid is closed
- b.Not allowed on any road✓
- c.Allowed with a flag car
- d.Allowed below 25 mph
Asphalt kettles may not be transported over any highway, road or street while the heat source is operating, except kettles patching road surfaces.2025 CFC 303.1
Asbestos-containing roofing is being removed next to rooftop air handlers. What must be done with the air intakes?
- a.Isolate them or shut the system down✓
- b.Nothing if the crew wears respirators
- c.Point a fan at them
- d.Tape a sign on each unit
During removal of asbestos-containing roofing, roof-level heating and ventilation air intake sources must be isolated or the ventilation system shut down.Cal. Code Regs. tit. 8 §1529
Two crews each remove 15 square feet of intact asbestos-containing roofing on the same roof on the same day. Does the under-25-square-foot allowance apply?
- a.Yes, if the crews use different tools
- b.Yes, if the work is on different slopes
- c.No; count all same-day work✓
- d.Yes; each crew is under 25 sq ft
In deciding whether a job is under 25 square feet, the employer must count all removal and repair work performed on the same roof on the same day. Together the crews remove 30 square feet.Cal. Code Regs. tit. 8 §1529
An existing roof covering is water soaked and no longer an adequate base. The owner asks for a recover. What does the code say?
- a.A recover is allowed after one week of drying
- b.A recover is allowed with a new base sheet
- c.A recover is allowed if the new roof is metal
- d.A recover is not permitted✓
A roof recover is not permitted where the existing roof or roof covering is water soaked or deteriorated to the point it is not an adequate base for additional roofing.2025 CRC R908.4
Which new system may be installed over an existing roof covering without removing it, because it carries its own loads to the structure?
- a.Shingles over two existing layers
- b.Clay tile over existing slate
- c.A separate standing-seam system✓
- d.Wood shakes over existing clay tile
Complete and separate roofing systems, such as standing-seam metal systems that transmit loads directly to the structure and do not rely on the existing roof, do not require removal of existing coverings.2025 CRC R908.4
What does the CRC mean by a roof replacement?
- a.Replacing only damaged shingles
- b.Coating the existing roof surface
- c.Removal down to the deck✓
- d.Adding a new layer over the old one
Roof replacement includes the removal of existing layers of roof coverings down to the roof deck. Installing a new covering over the old one is a recover.2025 CRC R908.3
An existing ice barrier membrane is well adhered to a sound, dry deck. During replacement, what may the roofer do with it?
- a.Cover it with more ice barrier, if permitted✓
- b.Leave it exposed as the finished roof
- c.Cover it with wood shakes directly
- d.Always grind it off the deck
Where an adhered ice barrier is on sheathing that is not water soaked or deteriorated, it may remain and be covered with an additional ice barrier layer where the roof covering and ice barrier manufacturers permit.2025 CRC R908.3 exception
During a ballasted single-ply reroof, some of the existing ballast stones are cracked. What may be done with them?
- a.Reinstall them at the roof corners
- b.Reinstall them under the new membrane
- c.Reinstall them if painted
- d.They may not be reinstalled✓
Existing ballast that is damaged, cracked or broken shall not be reinstalled under the CBC's reroofing section.2025 CBC 1512.4
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A walkway is provided past a roofing job for pedestrians. What is its minimum width?
- a.2 feet
- b.4 feet✓
- c.6 feet
- d.3 feet
Walkways must be of sufficient width for the pedestrian traffic but not less than 4 feet wide, with a durable walking surface.2025 CBC 3306.2
Where may pallets of roof tile be staged next to a neighbor's property line?
- a.Where no one or nothing is endangered✓
- b.Anywhere on the owner's lot
- c.In the neighbor's driveway overnight
- d.Against the neighbor's fence to save space
Construction equipment and materials must be stored and placed so as not to endanger the public, the workers or adjoining property for the duration of the project.2025 CBC 3301.2
When may an overhead conductor near a roofing job be treated as de-energized?
- a.When it sags below the roof edge
- b.When it looks old and unused
- c.When the homeowner says it is off
- d.After owner verification and visible grounding✓
Any overhead conductor is considered energized unless and until the person owning or operating the line verifies it is not energized and the line is visibly grounded at the work site.Cal. Code Regs. tit. 8 §2946(d)
What is the minimum clearance the Fire Code sets between an asphalt kettle and combustible material or a building opening?
- a.50 feet
- b.5 feet
- c.10 feet
- d.20 feet✓
Kettles stay at least 20 feet from combustible material, combustible building surfaces and building openings, inside a controlled area marked by cones or barriers. 10 feet is the distance for fuel containers from the burner, and 5 and 50 feet are not figures in this section.2025 CFC 303.2
To shorten the hose run, a roofer wants the kettle parked on the commercial roof deck. What does the Fire Code say?
- a.Kettles are not allowed on the roof✓
- b.It is allowed with a fire watch posted
- c.It is allowed if attended
- d.It is allowed on a noncombustible deck
Asphalt kettles and pots shall not be used inside or on the roof of a building. Attendance, a noncombustible deck and a fire watch are conditions found elsewhere in the rules, but none of them overrides this prohibition.2025 CFC 303.2
What extinguisher rating must be within 25 feet of an asphalt kettle while it is in use under the Fire Code?
- a.At least 3-A
- b.At least 20-B:C
- c.At least 40-B:C✓
- d.At least 2-A:10-B:C
The Fire Code requires an extinguisher with a minimum 40-B:C rating within 25 feet of each kettle in use, plus a separate multipurpose unit on the roof. 2-A:10-B:C and 20-B:C are too small for this rule, and 3-A alone has no flammable-liquid rating.2025 CFC 303.5
How must waste materials from a roofing job be removed, under CBC 3301.5?
- a.By burning them on site in a steel barrel each day
- b.By dropping them in a pile beside the wall for pickup
- c.So they do not injure persons or damage adjacent property✓
- d.By sweeping them into the street gutter each evening
Waste must be removed in a manner that prevents injury or damage to persons, adjacent properties and public rights-of-way. Piling, burning and sweeping into the street all create hazards.2025 CBC 3301.5
Where must roofing materials and equipment NOT be placed on a job next to a public road?
- a.Within 10 feet of a neighbor's fence
- b.Within 15 feet of a utility pole
- c.Within 30 feet of a driveway
- d.Within 20 feet of a street intersection✓
The code bars storage that obstructs hydrants, standpipes, alarm boxes, catch basins or manholes, and bars storage within 20 feet of a street intersection. The fence, driveway and utility-pole distances are not part of that rule.2025 CBC 3308.1.1
Before a reroof, what must the structural roof components be capable of supporting?
- a.The weight of the crew standing on the deck
- b.The dead weight of the finished covering itself
- c.The new covering plus material and equipment loads✓
- d.The weight of the existing covering being replaced
R908.2 requires the structure to carry the covering system and the material and equipment loads during installation. The finished covering alone, the old covering alone, or the crew alone each leave out part of the load.2025 CRC R908.2
A low-slope roof has an existing scupper that serves as its required secondary drainage. The roof is being replaced. What is the rule?
- a.Keep it if the roof membrane is a white one
- b.Keep it unless a code-compliant overflow system replaces it✓
- c.Remove it and seal the parapet wall opening shut with sealant
- d.Replace it with a single primary roof drain
Existing secondary drainage required by the code shall not be removed unless replaced by secondary drains or scuppers designed to Section 1502.2. Sealing the parapet would trap water, membrane color is unrelated, and a primary drain does not provide emergency overflow.2025 CBC 1512.1
A roof is not sloped to drain over its edges. Where does CRC R903.4 require roof drains?
- a.At each corner of the building
- b.Along the ridge line
- c.At the center of the roof
- d.At each low point of the roof✓
Unless the roof drains over its edges, drains go at every low point where water would collect. The center, the corners and the ridge are not selected by where water pools.2025 CRC R903.4
How tall must the opening of an overflow scupper through a parapet be, at minimum?
- a.6 inches
- b.8 inches
- c.2 inches
- d.4 inches✓
Overflow scuppers must be three times the size of the roof drains with a minimum opening height of 4 inches, and their inlet sits 2 inches above the low point. 2 inches is the inlet elevation, not the opening height; 6 and 8 inches are not set by the section.2025 CRC R903.4.1
During a reroof, an existing roof vent flange and edging are rusted. What does the CRC require?
- a.Prime and reuse them
- b.Replace them✓
- c.Cover them with mastic
- d.Reuse them if they are sealed
Existing flashings, edgings, outlets and vents that are rusted, damaged or deteriorated shall be replaced. Priming, mastic and sealing do not restore a corroded component.2025 CRC R908.5
Before bitumen is applied to sheet-metal flashing, what step does the CRC require?
- a.Leave it bare for best bonding
- b.Sand it before installation
- c.Prime it before installation✓
- d.Coat it with aluminized emulsion
Metal flashing to which bituminous materials are to be adhered shall be primed before installation. Sanding, aluminized emulsion and bare metal do not meet that requirement.2025 CRC R908.6
A roof leaks, and the owner wants a reflective coating applied. According to the DOE, what comes first?
- a.Apply ordinary exterior paint as a primer
- b.Apply the coating thick enough to bridge them
- c.Wait for the next rain to find them
- d.Repair the leaks and membrane problems✓
The DOE guidance says any leaks or problems with the membrane must be repaired before the roof is coated. A thick coating hides rather than cures defects, waiting does not repair, and ordinary paints are not designed to last on roofs.DOE Guidelines for Selecting Cool Roofs
A clay tile roof is leaking. According to the NPS, what must happen before repairs are made to the sheathing, felt or structural members?
- a.Identify the source and cause of the leak✓
- b.Remove the felt and underlayment from the deck
- c.Coat the entire roof with a thick sealant layer
- d.Replace the tiles on the leaking slope at once
The NPS says repairs to structural members, sheathing, felt or roofing paper follow once the source and cause of the leak are identified. Replacing every tile, sealing the roof or stripping the underlayment would not locate the cause.NPS Preservation Brief 30
Which condition prevents a roof recover (a new covering over the old) under the CRC?
- a.The deck is dry and sound
- b.The new covering follows manufacturer instructions
- c.The existing covering is one layer of shingles
- d.The roof already has two or more coverings✓
A recover is not allowed where the existing roof already has two or more applications of any covering. One existing layer, a dry sound deck and manufacturer-instructed installation are conditions that permit a recover.2025 CRC R908.4
When asbestos-containing roofing is removed, how must the material be taken off the roof wherever feasible?
- a.Pulverized with a power broom
- b.In an intact state✓
- c.Broken into small pieces
- d.Pried off with sudden force
Section 1529 requires roofing material to be removed in an intact state to the extent feasible, which limits dust. Breaking, pulverizing or prying with sudden force all render the material non-intact and release fibers.Cal. Code Regs. tit. 8 §1529
Asbestos-containing roofing will be rendered non-intact during removal. What method is required unless it is infeasible or creates a hazard?
- a.Dry power brushing
- b.Wet methods✓
- c.Compressed-air blowing
- d.Dry sweeping
Wet methods are required for roofing that is not intact or will be made non-intact, unless they are infeasible or create safety hazards. Dry sweeping, compressed air and dry brushing all throw dust into the air.Cal. Code Regs. tit. 8 §1529
Gravel-surfaced built-up roofing containing asbestos felts is being cut with a power cutter. What controls the dust?
- a.Collected by HEPA or HEPA vacuumed at the cut✓
- b.Left in place and covered with loose gravel
- c.Collected with a standard shop vacuum at the cut
- d.Swept dry with a broom along the cut line
For aggregate-surfaced built-up roofs, dust from the cutter must be collected by a HEPA dust collector or HEPA vacuumed along the cut line. Dry sweeping and ordinary vacuums release fibers, and leaving dust in place does not control it.Cal. Code Regs. tit. 8 §1529
Intact asbestos-containing roofing has been removed and is waiting on the roof. By when must it be lowered to the ground?
- a.By the end of the work week in which it is removed
- b.Within seven days after the material is removed
- c.After the entire roof job is finished and cleaned
- d.As soon as practicable, and by the end of the shift✓
Intact asbestos-containing material must be lowered as soon as practicable and in any event no later than the end of the work shift. Seven days, the end of the week or the end of the job all leave debris on the roof too long.Cal. Code Regs. tit. 8 §1529
Non-intact asbestos-containing roofing must stay on the roof for a time. What are the allowed ways to hold it?
- a.Piled by the roof edge under a weighted tarp until pickup
- b.Stacked loose and covered with roofing felt scraps
- c.Left dry on the roof so it stays light to lift
- d.Kept wet, bagged impermeably, or wrapped in plastic✓
While it stays on the roof, non-intact material must be kept wet, placed in an impermeable waste bag, or wrapped in plastic sheeting. Loose stacks, dry piles and tarps do not contain fibers.Cal. Code Regs. tit. 8 §1529
During a reroof, existing clay tiles are removed for reinstallation. Which of them may NOT be reinstalled?
- a.Tiles from the lowest course
- b.Tiles with moss on them
- c.Tiles that are cracked or broken✓
- d.Tiles with faded color
Existing slate, clay or cement tile may be reinstalled, but damaged, cracked or broken pieces may not. Color fade, position on the roof and moss are not damage under the rule.2025 CRC R908.5