NRCA ProCertified Asphalt Shingle Installer

What is the minimum thickness of OSB decking required by NRCA and IRC for steep-slope asphalt shingle applications?

• A7/16-inch span-rated OSB
• B3/8-inch OSB
• C1/2-inch OSB
• D5/8-inch OSB

Which underlayment standard specifies the requirements for Type II (heavyweight #30) felt used beneath asphalt shingles?

• AASTM D226 Type II
• BASTM D1970
• CASTM D4869
• DASTM D6757

According to ASTM D1970, self-adhering polymer-modified bituminous sheet (ice and water shield) must be applied at which locations on a steep-slope roof?

• AEaves, valleys, and all penetrations in cold climates
• BOnly at ridge vents and hip caps
• CEntire deck surface in all climates
• DOnly on north-facing slopes

Drip edge should be installed at the eave in what sequence relative to the underlayment?

• ADrip edge first (under the underlayment) at the eave
• BUnderlayment first, then drip edge over it at the eave
• CDrip edge installed over underlayment at both eave and rake
• DDrip edge is not required at the eave, only at the rake

What is the primary purpose of a starter strip course at the eave of an asphalt shingle roof?

• ATo seal the eave edge and provide backing for the first course of shingles
• BTo add a decorative border along the fascia
• CTo increase the total thickness at the ridge
• DTo replace the drip edge at the eave

When installing a 3-tab asphalt shingle in standard conditions, where should the nails be placed according to NRCA nailing zone guidelines?

• AIn the nail zone just above the adhesive strip, below the top of the cut-out slots
• BAlong the top edge of the shingle to minimize splitting
• C1 inch above the butt edge for maximum holding power
• DThrough the adhesive strip to seal the nail heads

What is the key difference between 'low-nailing' and 'high-nailing' on laminated asphalt shingles?

• ALow-nailing places fasteners in the manufacturer's nail zone for optimal wind resistance;…
• BLow-nailing is used on low-slope roofs; high-nailing is used on steep-slope roofs
• CHigh-nailing penetrates more shingle layers and is preferred by NRCA
• DLow-nailing is a defective installation that voids manufacturer warranties

In a high-wind zone (130+ mph design speed), how many nails per shingle does NRCA recommend for standard laminated asphalt shingles?

• A6 nails per shingle
• B4 nails per shingle
• C2 nails per shingle
• D8 nails per shingle

What is the standard exposure for a 3-tab asphalt shingle with a 36-inch-long tab section?

• A5 inches
• B6 inches
• C4 inches
• D7 inches

The minimum offset (horizontal stagger) between vertical joints in adjacent courses of asphalt shingles should be at least:

• A5 to 6 inches
• B1 to 2 inches
• C12 inches
• DEqual to one full tab width (12 inches for 3-tab)

In an open-metal valley installation on an asphalt shingle roof, what is the minimum width of the open channel that must remain clear at the center of the valley?

• AAt least 3 inches wide at the top, expanding 1/8 inch per foot toward the eave
• BExactly 6 inches wide throughout
• CThe full width of the metal flashing, with no shingles along the edge
• D1 inch wide — only enough to direct water to the metal

What distinguishes a 'closed-cut' valley from a 'woven' valley in asphalt shingle installation?

• AIn a closed-cut valley, shingles from one roof plane extend past the centerline and are t…
• BA closed-cut valley uses no metal flashing; a woven valley requires metal at the bottom
• CWoven valleys are required in high-wind zones; closed-cut is for low-wind areas
• DClosed-cut valleys are only used on roofs with slopes above 12:12

When installing step flashing at a sidewall-to-roof intersection, what dimension should each individual step flashing piece be?

• AAt least as tall as the shingle exposure plus 2 inches, and wide enough to extend at leas…
• BEqual to the full shingle height with no overlap required
• C6 inches by 6 inches for all shingle exposures
• DOne continuous piece running the full length of the wall

What is the function of counterflashing in a roofing assembly?

• ACounterflashing covers the top of step flashing to prevent water from running behind the…
• BCounterflashing is installed at the drip edge to direct water into gutters
• CCounterflashing replaces valley metal in chimney intersections
• DCounterflashing seals the ridge vent to prevent moisture infiltration

For hip and ridge shingles, NRCA recommends nailing the cap pieces to ensure each nail is covered by the next overlapping cap shingle. The nail should be positioned approximately how far from the exposed butt edge of the cap shingle?

• AAt the head of the cap shingle, within 1 inch of the end that will be covered by the next…
• BAlong the center of the cap shingle for maximum holding power
• C1 inch from the butt (exposed) edge
• DOn both sides of the ridge for a balanced connection

The IRC requires ridge ventilation to follow the 1:150 or 1:300 net free area rule. Under the 1:300 rule, a 1,500-square-foot attic floor requires how many square inches of total net free ventilation area?

• A60 square inches (half intake, half exhaust)
• B150 square inches total
• C30 square inches total
• D300 square inches at the ridge only

Under IRC R806.2, which condition allows attic ventilation to meet the 1:300 ratio instead of the stricter 1:150 ratio?

• AAt least 50% of the required ventilation area is provided at the eave or below the top of…
• BThe attic has a vapor retarder on the warm-in-winter side
• CThe roof slope is greater than 4:12
• DThe attic is conditioned space with HVAC equipment

Cold-weather shingle installation requires attention to handling and adhesion. At what approximate temperature does NRCA caution that asphalt shingle sealant strips may not self-seal without supplemental application of roofing cement?

• ABelow 40°F (4°C)
• BBelow 32°F (0°C)
• CBelow 50°F (10°C)
• DBelow 20°F (-7°C)

When asphalt shingles become brittle in cold weather, what installation precaution should roofers take?

• AStore shingles in a heated space and handle gently to prevent cracking; warm bundles befo…
• BInstall shingles immediately upon delivery regardless of temperature
• CIncrease nail count to compensate for reduced flexibility
• DApply a heat gun to each shingle to soften it before nailing

What is the fundamental difference between a 'tear-off' and a 'reroof' (overlay) when replacing an existing asphalt shingle roof?

• ATear-off removes all existing shingles and underlayment to the bare deck; reroof installs…
• BTear-off adds a second layer; reroof removes the old roof entirely
• CReroof is required by NRCA in all climate zones; tear-off is only used in coastal areas
• DThere is no functional difference — both methods expose the deck during installation

Under OSHA 29 CFR 1926 Subpart M, at what height does fall protection become mandatory for residential roofing work?

• AAny fall hazard greater than 6 feet above a lower level
• BAny fall hazard greater than 4 feet
• COnly when the ridge height exceeds 10 feet from grade
• DFall protection is required only on commercial roofing, not residential

Which of the following is an acceptable method of fall protection under OSHA Subpart M for residential steep-slope roofing?

• APersonal fall arrest system (PFAS) anchored to a certified roof anchor point
• BA warning line system set 2 feet from the roof edge
• CSafety monitor system used alone without any other protection on roofs over 10:12 pitch
• DRoofing brackets (jacks) installed at 4-foot intervals

What manufacturer warranty condition is most commonly voided when asphalt shingles are installed improperly?

• AHigh-nailing (nails placed above the manufacturer's marked nail zone)
• BUsing galvanized steel roofing nails instead of stainless steel
• CInstalling shingles on a slope less than 4:12 with standard exposure
• DLapping felt underlayment more than 6 inches

A laminated shingle manufacturer requires a minimum 4:12 roof slope for standard installation. What special installation procedure is required if the slope is between 2:12 and 4:12?

• ADouble underlayment and hand-sealing of each shingle with roofing cement, plus reduced ex…
• BNo additional steps — standard installation applies below 4:12
• CIce and water shield is applied as the only underlayment, replacing felt
• DShingles are installed horizontally (turned 90°) for better water shedding

What is the correct nail type and minimum size for fastening asphalt shingles to standard wood decking?

• ARoofing nails with a 3/8-inch head diameter, minimum 1-1/4 inches long (or long enough to…
• B16d sinker nails, hot-dipped galvanized
• CStaples with a 1-inch crown, minimum 7/8 inch long
• DDrywall screws, coarse thread, 1-1/2 inch

Synthetic underlayment used beneath asphalt shingles must meet which performance criteria compared to #30 felt per ASTM D226 Type II?

• AIt must meet or exceed the tear strength and water resistance of ASTM D226 Type II, typic…
• BSynthetic underlayment has no formal ASTM requirement — any woven polypropylene product i…
• CSynthetic underlayment must only meet ASTM D1970 (self-adhering sheet) requirements
• DSynthetic underlayment is prohibited under laminated (architectural) shingles per NRCA

When installing #30 felt underlayment on a 6:12 slope, what is the minimum head lap (vertical overlap) between courses required by NRCA?

• A2 inches minimum horizontal lap between courses
• B6 inches minimum
• CNo minimum — underlayment is only a secondary protection
• D12 inches — the full width of one half of the felt roll

What is the purpose of the 'ice dam protection zone' required by IRC R905.2.7 at roof eaves?

• ATo prevent water from an ice dam from infiltrating the structure by applying self-adherin…
• BTo provide additional structural support at the eave under ice loads
• CTo improve ventilation at the eave to melt ice dams faster
• DTo waterproof the gutter attachment point

What is the purpose of installing drip edge at the rake (gable) edge of a roof?

• ATo direct water away from the fascia board and into the gutter or clear of the structure…
• BTo provide additional nailing support for the first course of shingles
• CTo create a decorative border at the gable end of the roof
• DTo seal the gap between the last rafter and the exterior wall

When applying a starter strip at the eave, the NRCA recommends the sealant strip of the starter should face in which direction?

• AFacing up (toward the sky), positioned at the eave edge
• BFacing down (toward the deck) to adhere the starter to the deck
• CFacing toward the ridge, positioned 3 inches back from the eave
• DSealant strip direction does not matter as long as nails are applied

A roofer is nailing laminated shingles on a 7:12 slope. The air nailer is set too deep, causing the nail heads to break through the shingle granules. What defect does this create?

• AOverdriven nails cut through the shingle mat, reducing wind uplift resistance and creatin…
• BOverdriven nails increase adhesion of the sealant strip to the course below
• CDeeply set nails improve holding power and are preferred by manufacturers
• DOverdriven nails only affect aesthetics, not structural performance

In an open-metal valley, what type of metal flashing does NRCA recommend, and why is it installed with the center crimped?

• A24-gauge galvanized steel or aluminum valley metal, with a center crimp (ridge) to preven…
• B22-gauge copper, crimped to allow thermal expansion without buckling
• CAny sheet metal painted to match the shingles; the crimp improves drainage velocity
• DGalvanized sheet metal, uncrimped, with a sealant bead along the center

When laminated (architectural) shingles are used in a woven valley, what issue commonly arises?

• ALaminated shingles are too thick and rigid to weave through the valley — the multiple gra…
• BLaminated shingles cannot be nailed within 6 inches of the valley centerline
• CWoven valleys work best with laminated shingles because of their irregular surface pattern
• DWoven valleys require copper valley flashing, which is incompatible with laminated shingl…

Where should nails NOT be placed in an open-metal valley installation?

• AWithin 6 inches of the valley centerline
• BWithin 12 inches of the drip edge
• CAlong the first course at the eave in the valley
• DWithin the nail zone printed on the shingle

A chimney wider than 30 inches requires what special cricket (saddle) requirement according to NRCA and IRC?

• AA cricket (saddle) must be installed at the high side of the chimney to divert water arou…
• BExtra counterflashing must be lapped 4 inches over the chimney cap
• CThe chimney must be waterproofed with a single-ply membrane on all four sides
• DAn additional course of shingles must be installed across the entire chimney width

Galvanized roofing nails used for asphalt shingles should have a minimum zinc coating weight of what specification to meet corrosion resistance requirements?

• AASTM A153 Class D hot-dipped galvanized coating (or equivalent)
• BElectroplated zinc coating, any thickness
• CStainless steel (Type 304 or 316) is the minimum requirement for all regions
• DAny zinc coating meeting ASTM A641 is acceptable

A homeowner's asphalt shingle roof shows granule loss in patches but no visible cracking. What is the most likely cause and expected consequence?

• ANormal weathering aging or hail impact; granule loss accelerates UV degradation of the as…
• BImproper felt underlayment causing moisture damage from below
• CBiological growth (moss/algae) that can be pressure-washed off to restore granule coverage
• DThermal shock from cold-weather installation causing granules to detach

Before performing a full tear-off, the roofer inspects the wood deck and finds a section of 7/16-inch OSB with soft spots and discoloration. What is the correct action per NRCA best practices?

• AReplace the damaged OSB section with new span-rated 7/16-inch (or equivalent) OSB before…
• BCover the soft spot with a self-adhering ice-and-water shield and proceed with roofing
• CInstall a second layer of 3/8-inch OSB over the soft area and continue
• DApply roofing cement to the soft spots to stabilize the OSB and nail into surrounding goo…

A roofer needs to install a ladder to access a residential roof. Under OSHA 1926.1053, which ladder setup rule applies?

• AExtension ladders must be set up at a 4:1 angle (1 foot out for every 4 feet of height) a…
• BLadders must be set up vertically against the wall for maximum stability
• CA ladder angle of 3:1 is acceptable for roofing access ladders
• DLadders must be secured at the top but need not extend above the landing point

In a reroof (overlay) installation, what is the maximum number of asphalt shingle layers most building codes allow on a residential structure?

• ATwo layers maximum
• BThree layers if the existing deck is in good condition
• CNo limit — code defers to manufacturer recommendation
• DOne layer — reroof overlays are not code-compliant

What is the purpose of 'kick-out flashing' (diverter flashing) at the lower end of a roof-to-wall intersection where a step flashing terminates?

• ATo direct water away from the wall cladding and into the gutter rather than allowing it t…
• BTo provide additional wind resistance at the wall-to-roof transition point
• CTo serve as a starter strip for the rake shingles along the wall
• DTo prevent thermal expansion of the step flashing from damaging the wall finish

When a roofing contractor establishes a competent person for fall protection on a residential project, what responsibilities does that person hold under OSHA?

• AThe competent person must identify existing and predictable fall hazards and have the aut…
• BThe competent person only needs to verify that harnesses are present on the job site
• CThe competent person is responsible for setting up scaffolding but not for fall arrest sy…
• DCompetent person designation is only required on projects over 3 stories in height

Hip roofs require hip cap shingles to be installed from the eave up toward the ridge. What is the correct installation direction?

• AFrom the eave toward the ridge, beginning at the eave end of the hip
• BFrom the ridge downward toward the eave to ensure caps cover the ones below
• CHip direction does not matter as long as nails are in the correct zone
• DFrom the centerline of the hip outward to both the eave and ridge simultaneously

A manufacturer's product data sheet specifies a maximum slope of 21:12 for a particular laminated shingle. What application challenge exists for steep slopes above this limit?

• AOn slopes above 21:12 (approximately 60°), shingles are nearly vertical and cannot self-s…
• BAbove 21:12, shingles must be replaced with metal roofing — asphalt shingles are structur…
• CIRC prohibits asphalt shingles above 12:12 slope
• DAbove 21:12, three courses of underlayment are required instead of two

During a reroof overlay, the roofer discovers the existing shingles are cupped (concave) along the tabs. What should the roofer do before applying the new shingles?

• AIdentify and repair the cause of the cupping, then mechanically fasten down cupped tabs t…
• BProceed with the overlay immediately — the new shingle layer will flatten the existing cu…
• CRemove and replace only the cupped shingles, leaving the rest as a base for overlay
• DApply roofing cement under each cupped tab to fill the void and continue

When estimating waste factor for a standard hip-and-ridge roof with multiple valleys compared to a simple gable roof, how does the waste factor typically change?

• AHip-and-ridge roofs and roofs with valleys have higher waste factors (typically 15–20%+)…
• BWaste factor is the same for all roof types — always 10%
• CGable roofs have higher waste due to more rake-edge cuts
• DHip roofs require less material than gable roofs because there are no rakes