Nevada C-15A Roofing Contractor Examination

Under OSHA 1926.501, at what height above a lower level must employees doing roofing work be protected from falling?

• A4 feet (1.2 m)
• B6 feet (1.8 m)
• C10 feet (3.0 m)
• D15 feet (4.6 m)

How does OSHA 1926.500 define a low-slope roof for fall-protection purposes?

• AA roof sloped 2:12 or less
• BA roof sloped less than or equal to 4:12
• CA roof sloped less than 3:12
• DAny roof that drains to internal drains

What work does NAC 624.320 authorize under Nevada C-15A Roofing?

• ASiding and weatherstripping for internal weather control, plus roofing
• BInstallation, application, alteration, and repair of watertight roofing materials, includ…
• CRoofing plus installation of PV conduits, inverters, batteries, and electrical connections
• DAny C-15 siding, insulation, or waterproofing work without a separate subclassification

When mechanical equipment is not being used, how far from the roof edge must a warning line be erected on a low-slope roof?

• ANot less than 4 feet (1.2 m)
• BNot less than 6 feet (1.8 m)
• CNot less than 10 feet (3.1 m)
• DNot less than 15 feet (4.6 m)

A gravel spreader is traveling parallel to a low-slope roof edge. How far back must the warning line be from the edge that is perpendicular to the machine's travel?

• A4 feet (1.2 m)
• B6 feet (1.8 m)
• C10 feet (3.1 m)
• D15 feet (4.6 m)

What height range does OSHA 1926.502(f) require for a warning line, including sag?

• ANo less than 21 inches and no more than 28 inches
• BNo less than 34 inches and no more than 39 inches
• CNo less than 39 inches and no more than 45 inches
• DA constant 42 inches with no sag allowed

On which low-slope roof may a safety-monitoring system be used by itself, without a warning line?

• AAny low-slope roof if a competent person says conventional protection is expensive
• BA roof 50 feet (15.25 m) or less in width
• CA roof 100 feet or less in either plan dimension
• DA steep roof between 4:12 and 6:12

Which fall-protection option is NOT allowed for roofing work on a steep roof (slope greater than 4:12) 6 feet or more above a lower level?

• AGuardrail systems
• BSafety net systems
• CPersonal fall-arrest systems
• DA warning-line system combined with a safety monitor

Which set of warning-line hardware rules matches OSHA 1926.502(f)?

• AFlagged at 10-foot intervals, 200-pound line tensile strength, stanchions that resist 200…
• BFlagged at not more than 6-foot intervals, line tensile strength of at least 500 pounds,…
• CUnflagged cable is acceptable if it is yellow, 5,000-pound tensile strength, stanchions t…
• DFlagged only at corners, 50-pound line, traffic cones used as stanchions

A portable extension ladder serves a 16-foot eave. Using OSHA's 4:1 angle, what is the approximate horizontal distance from the wall to the ladder feet, and how far must the side rails extend above the eave?

• A2 feet out and 2 feet above
• B4 feet out and at least 3 feet above
• C8 feet out and flush with the eave
• D16 feet out and 6 feet above

What deck does IBC 2018 require under asphalt shingles?

• AA solidly sheathed deck
• BOpen purlins spaced 24 inches on center
• CSpaced 1x4 skip sheathing with 3-inch gaps
• DBare steel deck flutes with no cover board

Why are wood shakes commonly applied over spaced sheathing rather than a fully closed solid deck without ventilation?

• ASpaced sheathing increases the fire classification from Class C to Class A
• BThe gaps let the underside of the wood dry and reduce cupping and decay
• CIBC 2018 forbids solid decks under any wood roof covering
• DSpaced sheathing replaces the required underlayment

In roofing estimating (Atcheson and standard trade practice), what is one roofing square?

• A10 square feet of roof surface
• B100 square feet of roof surface
• C1,000 square feet of roof surface
• DThe plan area of one 10-foot by 10-foot room, ignoring slope

Which substrate is the usual nailable deck for steep-slope asphalt shingles on wood-framed buildings?

• AWood structural panel sheathing (plywood or OSB) or solid board sheathing
• BBare light-gauge steel deck without a nailable overlay
• CStructural concrete with no overlay
• DLoose-laid polyisocyanurate only

What is the primary purpose of a cant strip at the base of a built-up or modified-bitumen wall flashing?

• ATo replace the need for counterflashing
• BTo provide a 45-degree transition so the membrane is not bent at a sharp right angle
• CTo vent moisture from the insulation
• DTo serve as the structural nailer for the parapet coping

A 40-foot by 50-foot rectangular low-slope roof is measured in plan and is essentially flat. How many roofing squares of membrane are needed before waste?

• A2.0 squares
• B20 squares
• C45 squares
• D200 squares

Before mopping or adhering a bituminous membrane to a structural concrete deck, what substrate condition is required?

• AThe slab may be damp if a Type I asphalt is used
• BThe concrete must be cured, dry, clean, and primed when the specification requires primer
• CLaitance and form-release oil may remain if they are mopped over hot
• DA flood coat of gravel is applied first to key the felts

How is roof insulation typically attached over a steel roof deck for a low-slope membrane?

• ANailed through the flutes with common 8d nails
• BMechanically fastened or adhered to the deck (or to a cover/thermal barrier) per the list…
• CLoose-laid with no attachment if the membrane is fully adhered
• DHot-mopped directly to galvanized flutes with no insulation

Wet polyisocyanurate or wet wood fiber is found in a test cut on a 10-year-old low-slope roof. What is the correct substrate decision before a new membrane?

• ARecover over the wet insulation; the new sheet will dry it out
• BRemove wet insulation and wet substrate materials and replace them with dry materials bef…
• CInstall a second layer of wet insulation to average out the moisture
• DTorch a cap sheet over the wet area to drive the water out

On a new low-slope roof, how is the IBC 2018 minimum 1/4:12 design slope most often built when the structure itself is dead level?

• ABy relying on camber alone
• BWith tapered insulation, sloped fill, or a sloped structural deck
• CBy increasing membrane thickness from 45 mil to 80 mil
• DBy adding extra gravel at the drains

Where is a vapor retarder placed in a low-slope roof assembly over a conditioned building in a cold or mixed climate?

• AOn top of the membrane as a sacrificial traffic sheet
• BOn the warm side of the insulation, typically on or just above the deck, so interior mois…
• CBetween the flood coat and the gravel
• DVapor retarders are never used under single-ply membranes

A gable roof has a 40-foot by 60-foot plan rectangle and a 4:12 slope (slope factor 1.054). What is the roof surface area, in squares, before waste?

• A20.0 squares
• B24.0 squares
• C25.3 squares
• D40.0 squares

A 2,400-square-foot plan roof is 6:12 (slope factor 1.118). With 10 percent waste, how many squares of steep-slope covering should you order?

• A24 squares
• B27 squares
• C30 squares
• D36 squares

Tapered insulation is specified at 1/4 inch per foot from a 4-inch cricket valley to a 20-foot run toward a curb. What thickness is required at the high edge of that cricket?

• A4.0 inches
• B5.0 inches
• C9.0 inches
• D20.0 inches

What is the IBC 2018 minimum roof slope for asphalt shingles?

• A1:12
• B2:12
• C3:12
• D4:12

On an asphalt-shingle roof with a 3:12 slope, what underlayment application does IBC 2018 require?

• ANo underlayment; the self-seal strip is enough
• BA single layer lapped 2 inches
• CDouble underlayment application
• DOnly ice-barrier membrane from eave to ridge

Where an ice barrier is required, how far must it extend up the roof from the eave?

• ATo the fascia only
• B24 inches past the interior face of the exterior wall
• C6 inches past the exterior face of the wall
• DTo the ridge on every roof, regardless of climate

Where does IBC 2018 require drip edge on an asphalt-shingle roof?

• AAt the ridge only
• BAt eaves and rake edges
• COnly where a gutter is omitted
• DOnly on roofs steeper than 8:12

What is the IBC 2018 minimum slope for wood shakes?

• A2:12
• B2-1/2:12
• C3:12
• D4:12

What is the IBC 2018 minimum slope for clay and concrete tile?

• A2:12
• B2-1/2:12
• C3:12
• D4:12

What is the IBC 2018 minimum slope for slate roofing?

• A2:12
• B2-1/2:12
• C3:12
• D4:12

What is the IBC 2018 minimum slope for wood shingles?

• A2:12
• B3:12
• C4:12
• D6:12

What is the IBC 2018 minimum slope for metal roof shingles?

• A1/4:12
• B1/2:12
• C2:12
• D3:12

What is the IBC 2018 minimum slope for mineral-surfaced roll roofing used as a steep-slope covering?

• A1/4:12
• B1:12
• C2:12
• D4:12

How is underlayment sequenced with drip edge on an IBC 2018 asphalt-shingle roof?

• AUnderlayment over the drip edge at eaves and under the drip edge at rakes
• BUnderlayment under the drip edge at eaves and over the drip edge at rakes
• CUnderlayment over the drip edge at both eaves and rakes
• DDrip edge is installed after the shingles so underlayment sequence does not matter

Which drip-edge dimensions match IBC 2018 1507.2.8.3?

• A1-inch laps, 1-inch vertical leg, flush with the sheathing, fastened 24 inches on center
• BNot less than 2-inch laps, 1-1/2-inch vertical leg extending 1/4 inch below the sheathing…
• C6-inch laps, 4-inch vertical leg, 6 inches back on the roof, fastened 6 inches on center
• DNo lap required if the joints are sealed with roof cement

What fastener rules does IBC 2018 1507.2.6 set for asphalt shingles?

• ACommon 16d nails with 1/4-inch heads, 1/2-inch embedment
• BGalvanized, stainless, aluminum, or copper roofing nails, minimum 12-gage shank, 3/8-inch…
• CStaples of any crown width if they penetrate 1/2 inch
• DDrywall screws with 1-inch embedment

Which materials satisfy the IBC 2018 ice-barrier requirement?

• AA single layer of No. 15 felt turned up the wall 6 inches
• BAt least two layers of underlayment cemented together, or a self-adhering polymer-modifie…
• CA peel-and-stick patch only at each nail hole
• DMetal drip edge with no membrane

How does IBC 2018 start a double-underlayment application on a 2:12 to 4:12 asphalt-shingle roof?

• AWith a full 36-inch sheet starting at the ridge and working down
• BWith a minimum 19-inch-wide strip of underlayment parallel to and starting at the eaves,…
• CWith self-adhering membrane on the ridge only
• DWith a single 36-inch sheet and 2-inch laps

On an asphalt-shingle roof, where two 4:12 planes meet in a valley, about what slope is the valley itself?

• AStill 4:12
• BAbout 3:12 — flatter than the adjacent planes
• CAbout 6:12 — steeper than the adjacent planes
• DDead level

What flashing is required where a steep-slope roof dies into a vertical sidewall?

• AA single L-metal pan running the full wall with no steps
• BStep flashing woven with each shingle course, plus wall covering or counterflashing over…
• CRoof cement only, with no metal
• DDrip edge turned up the wall

Where a sloped roof eave meets a vertical wall, what flashing is needed to kick water out of the wall and into the gutter?

• ARidge vent
• BKickout (diverter) flashing
• CA cricket on the downhill side of the wall
• DGravel stop

When does IBC 2018 require a cricket or saddle on the ridge side of a chimney or penetration?

• AOn every pipe jack, regardless of diameter
• BWhen the chimney or penetration is greater than 30 inches wide measured perpendicular to…
• COnly on chimneys taller than 15 feet
• DOnly when the roof slope is 8:12 or steeper

On slopes under 7:12, what additional step does IBC 2018 require for metal valley flashing underlayment?

• AOmit the valley metal and rely on woven shingles
• BSolidly cement the metal valley flashing underlayment to the roofing underlayment
• CInstall the valley metal over the finished shingles
• DUse only a 6-inch-wide valley metal

What is the usual weather exposure for a standard 36-inch three-tab asphalt shingle?

• A2 inches
• B5 inches
• C12 inches
• D17 inches