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NRCA ProCertified Asphalt Shingle Installer study materials
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NRCA ProCertified Asphalt Shingle Installer practice questions

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Question 1Jobsite Safety and Fall Protection

At what height above a lower level must an employee be protected from falling while working on a residential roof, according to OSHA's general industry fall protection rules for construction work?

  1. 6 feet Correct answer.
  2. 10 feet
  3. 4 feet
  4. 15 feet

Explanation

OSHA's construction fall protection standard for residential roofing requires conventional fall protection when employees are exposed to falls of 6 feet or more to a lower level. The 6-foot trigger applies to steep and low-slope residential roofs alike. Knowing the exact threshold helps the crew leader decide when harnesses, guardrails, or warning lines must be deployed.

Question 2Jobsite Safety and Fall Protection

A roofer is installing shingles near a roof edge on a steep-slope roof. Which practice best satisfies the requirement to provide conventional fall protection?

  1. Keeping the ladder in place at the eave as the only safeguard
  2. Standing only on the lower half of the roof
  3. Relying on steady footing and experience alone
  4. Using a personal fall arrest system anchored to a suitable anchor point Correct answer.

Explanation

Conventional fall protection for steep-slope roofing includes guardrail systems, safety net systems, or personal fall arrest systems. A personal fall arrest system with a proper anchor, full-body harness, and connecting device is the standard method on residential steep roofs. Skill and caution do not substitute for an engineered protective system.

Question 3Jobsite Safety and Fall Protection

Which component of a personal fall arrest system is designed to limit the maximum arresting force on the worker's body during a fall?

  1. The lanyard's shock absorber Correct answer.
  2. The roof jack
  3. The D-ring on the harness
  4. The drip edge

Explanation

A shock-absorbing lanyard deploys or stretches to dissipate energy and cap the arresting force transmitted to the body. Without it, a fall could impose forces high enough to cause serious injury even if the harness holds. The other listed items do not manage energy during a fall.

Question 4Jobsite Safety and Fall Protection

Where should a personal fall arrest system anchor point be located for a worker on a roof?

  1. Below the eave line
  2. At or above the worker's shoulder level, where feasible Correct answer.
  3. At the base of the ladder
  4. At the worker's knee level

Explanation

Anchoring at or above shoulder height reduces free-fall distance and swing-fall hazard and helps keep the arrest force within limits. Anchors below the worker increase both drop distance and the chance of hitting a lower surface. Choosing an overhead-capable anchor is a key planning step before roof work begins.

Question 5Jobsite Safety and Fall Protection

Before climbing onto a roof, a crew member inspects the full-body harness and finds frayed webbing and a cracked D-ring. What is the correct action?

  1. Reverse the harness so the damaged side faces outward
  2. Tape the frayed area and proceed
  3. Tag the harness out of service and replace it before use Correct answer.
  4. Use the harness only for short tasks

Explanation

Damaged personal fall arrest equipment must be removed from service immediately and replaced; it cannot be repaired in the field with tape or workarounds. Frayed webbing and a cracked D-ring compromise the system's ability to arrest a fall. A pre-use inspection is required before each use.

Question 6Jobsite Safety and Fall Protection

What is the primary purpose of a warning line system on a low-slope commercial roof during shingle or membrane work?

  1. To warn workers that they are approaching an unprotected roof edge Correct answer.
  2. To provide an anchor for lanyards
  3. To physically stop a falling worker
  4. To mark the location of roof drains

Explanation

A warning line is a barrier set back from the roof edge to alert workers they are nearing a fall hazard; it does not physically restrain or arrest a fall. On low-slope roofs it is often combined with a safety monitoring system for certain tasks. Workers must understand that crossing the line signals proximity to the edge.

Question 7Jobsite Safety and Fall Protection

A safety monitor system is being used on a low-slope roof. What is the safety monitor's required role?

  1. To operate the hoist
  2. To inspect the roof deck for moisture
  3. To install shingles alongside the crew
  4. To warn workers when they are unaware of a fall hazard and to be able to see them at all times Correct answer.

Explanation

The safety monitor must be a competent person whose sole responsibility is to recognize fall hazards and warn workers who appear unaware of them. The monitor must be positioned to see the workers and communicate effectively. Performing other tasks defeats the purpose of the role.

Question 8Jobsite Safety and Fall Protection

Which ladder setup is acceptable when accessing a roof to install shingles?

  1. The ladder is placed on soft ground without footings
  2. The ladder top is flush with the eave and unsecured
  3. The ladder is leaned at a very shallow angle for stability
  4. The ladder extends at least 3 feet above the roof edge and is secured against movement Correct answer.

Explanation

Extension ladders used for roof access should extend at least 3 feet above the landing surface and be secured to prevent slipping or shifting. A proper 4:1 angle and firm footing are also required. These measures give the worker a handhold when stepping onto the roof and keep the ladder stable.

Question 9Jobsite Safety and Fall Protection

A worker is using a rope grab on a vertical lifeline while moving across a steep roof. How should the rope grab be positioned?

  1. Kept above the worker and adjusted to minimize slack as the worker moves Correct answer.
  2. Left at the bottom of the lifeline
  3. Clipped to the worker's belt rather than the harness D-ring
  4. Detached while moving between sections

Explanation

A rope grab should ride above the worker so that a fall is arrested quickly with minimal free fall. The worker adjusts it along the lifeline as they move to keep slack low. Detaching the grab or clipping elsewhere defeats the arrest function.

Question 10Jobsite Safety and Fall Protection

How often must a personal fall arrest system be inspected by the user?

  1. Only after a fall
  2. Before each use Correct answer.
  3. Only when the equipment looks new
  4. Once per year

Explanation

OSHA requires a personal fall arrest system to be inspected before each use for wear, damage, and deterioration. Frequent pre-use inspection catches frayed webbing, cracked hardware, and damaged lanyards before they fail. Annual or post-fall inspections by a competent person supplement, but do not replace, the daily check.

Question 11Jobsite Safety and Fall Protection

What is the maximum free-fall distance generally allowed for a personal fall arrest system before the worker's body contacts a lower level?

  1. 20 feet
  2. 6 feet Correct answer.
  3. 15 feet
  4. 10 feet

Explanation

Personal fall arrest systems are generally limited to a maximum free fall of 6 feet, with the anchor at or above shoulder level. This limit keeps arresting forces within the body's tolerance and allows the shock absorber to function as designed. Exceeding it can cause the worker to strike a lower surface or suffer excessive force.

Question 12Jobsite Safety and Fall Protection

A crew is installing shingles on a roof with a 4:12 slope. Which fall protection approach is most consistent with OSHA's low-slope residential requirements?

  1. Conventional fall protection such as a personal fall arrest system or guardrails Correct answer.
  2. Only a warning line at the ridge
  3. No protection, because 4:12 is considered flat
  4. Relying on the roof's texture for grip

Explanation

A 4:12 roof is a low-slope roof, and OSHA's residential fall protection rules still require protection when workers are exposed to a 6-foot or greater fall. Conventional systems such as guardrails or personal fall arrest are acceptable. Roof slope alone never eliminates the need for protection.

Question 13Jobsite Safety and Fall Protection

After a worker's fall arrest system has arrested a fall, what must happen to the equipment?

  1. It must be removed from service and inspected by a competent person before reuse Correct answer.
  2. It can be reused immediately if it looks clean
  3. It can be sold to another crew
  4. Only the lanyard needs replacement

Explanation

Any personal fall arrest system that has arrested a fall must be removed from service and inspected by a competent person before it is used again. The forces involved can damage webbing and hardware in ways that are not always visible. Reuse without inspection risks catastrophic failure in a subsequent fall.

Question 14Jobsite Safety and Fall Protection

Which condition on a roof deck should prompt a worker to stop and reassess fall protection before proceeding?

  1. Frost or morning dew on the shingle surface Correct answer.
  2. A roof with a preinstalled anchor point
  3. A roof with a parapet wall on all sides
  4. A clear, dry roof with a gentle slope

Explanation

Frost, dew, or wet shingles create a slip hazard that increases the likelihood of a fall and may require additional precautions or postponement. Workers should reassess conditions and protection before continuing. Dry surfaces, engineered anchors, and parapets reduce risk rather than increase it.

Question 15Jobsite Safety and Fall Protection

A worker on a steep roof must cross a roof valley to reach the work area. What is the safest approach regarding fall protection?

  1. Have a coworker hold the lanyard by hand
  2. Cross without protection because valleys are flat
  3. Remain tied off and plan the route so the lifeline does not create a swing-fall hazard Correct answer.
  4. Untie to cross the valley quickly, then re-tie

Explanation

Workers should stay connected and plan movement so the lifeline remains overhead and swing-fall hazards are minimized. Disconnecting removes protection entirely, and a hand-held lanyard is not an anchor. Valley geometry can create pendulum hazards that must be anticipated.

Question 16Jobsite Safety and Fall Protection

What is the required clearance below a worker when using a shock-absorbing lanyard, and why does it matter?

  1. Clearance matters only on flat roofs
  2. No clearance is needed if the harness fits well
  3. Exactly 2 feet, regardless of lanyard type
  4. Enough distance for the lanyard to deploy plus a safety margin, so the worker does not strike a lower level Correct answer.

Explanation

The worker must have enough clearance below for the shock absorber to fully deploy, the harness to stretch, and a safety margin so the body does not contact a lower surface. This distance depends on the lanyard type and anchor height. Ignoring it can turn an arrested fall into an impact injury.

Question 17Jobsite Safety and Fall Protection

A worker is using a self-retracting lifeline on a roof. What advantage does it offer compared with a standard shock-absorbing lanyard?

  1. It continuously takes up slack, reducing free-fall distance Correct answer.
  2. It can be anchored to the roof jack
  3. It eliminates the need for a harness
  4. It allows the worker to work without an anchor

Explanation

A self-retracting lifeline pays out and retracts line as the worker moves, keeping slack minimal and reducing free-fall distance. This makes it well suited to roof work where the worker travels across the surface. It still requires a harness and a suitable anchor.

Question 18Jobsite Safety and Fall Protection

Which of the following best describes a competent person for fall protection purposes?

  1. The crew member who owns the harnesses
  2. Someone capable of identifying existing and predictable hazards and authorized to take prompt corrective action Correct answer.
  3. The supplier who delivers the shingles
  4. Any worker with at least one year of roofing experience

Explanation

A competent person is defined by the ability to identify hazards and the authority to correct them promptly, not simply by tenure. This role is central to equipment inspection, hazard assessment, and enforcement of fall protection on the jobsite. Experience alone does not confer the authority the role requires.

Question 19Jobsite Safety and Fall Protection

A worker is installing ridge cap shingles while straddling the ridge. What fall protection consideration applies?

  1. Straddling the ridge eliminates the fall hazard
  2. The worker is still exposed to a fall and must be protected, even when straddling the ridge Correct answer.
  3. Ridge work requires only a warning line
  4. Ridge work can be done without protection if the roof is under 6 feet tall

Explanation

Straddling a ridge does not remove the fall exposure, and the worker must be protected according to the applicable fall protection requirements. The height threshold and roof slope determine which systems are acceptable. Assuming the ridge position is inherently safe is a common and dangerous mistake.

Question 20Jobsite Safety and Fall Protection

What should a crew do with a roof hatch or skylight that creates a fall hazard during shingle installation?

  1. Leave it open for ventilation
  2. Guard or cover it with a secured, marked cover that supports the intended load Correct answer.
  3. Rely on workers to remember its location
  4. Mark it with a single cone

Explanation

Holes and openings such as roof hatches and skylights must be guarded or covered with a cover that is secured, marked, and strong enough to support the intended load. This prevents workers from stepping or falling through. A cone or memory alone does not provide fall protection.

Question 21Jobsite Safety and Fall Protection

A worker's lanyard is anchored to a point that is offset far to one side of the work area. What hazard does this create?

  1. A swing fall that could cause the worker to strike a structure or the ground Correct answer.
  2. An increase in shingle adhesion
  3. A shorter free-fall distance
  4. A reduction in harness comfort

Explanation

An anchor offset to the side creates a pendulum or swing-fall hazard: the worker swings like a pendulum after the lanyard engages and may strike a wall, scaffold, or the ground. Anchoring above the work area minimizes this. Swing-fall hazards are a frequent cause of serious injury in roof work.

Question 22Jobsite Safety and Fall Protection

Which of the following is an acceptable way to protect workers from falls at the leading edge of a roof being shingled?

  1. Install guardrails along the edge before work begins Correct answer.
  2. Use caution tape as the only protection
  3. Rely on the roof's pitch to slow a fall
  4. Ask workers to stay back from the edge by memory

Explanation

Guardrails installed along the roof edge provide a physical barrier that prevents workers from reaching the fall hazard. Memory, caution tape, and slope do not provide fall protection. Guardrails are one of the conventional systems recognized for edge protection.

Question 23Jobsite Safety and Fall Protection

A crew plans to work on a roof in high winds with gusts forecast above 40 mph. What is the most appropriate safety decision?

  1. Continue and stack shingles near the edge for convenience
  2. Continue but remove all fall protection to reduce wind drag
  3. Continue with only one worker on the roof
  4. Postpone the work because wind increases fall and material-handling hazards Correct answer.

Explanation

High winds increase the risk of losing balance, being struck by wind-blown materials, and having equipment or shingle bundles shift. Postponing the work is the safest decision when conditions exceed what can be managed safely. Removing fall protection or reducing crew size does not address the wind hazard.

Question 24Jobsite Safety and Fall Protection

What is the purpose of a rescue plan when personal fall arrest systems are used on a roofing project?

  1. To ensure a worker suspended after a fall is retrieved promptly to prevent suspension trauma Correct answer.
  2. To replace the need for fall protection
  3. To satisfy the building inspector's permit requirements
  4. To document the number of shingles installed

Explanation

A fall arrest system leaves a worker suspended after arresting a fall, and prompt rescue is essential to prevent suspension trauma and other medical emergencies. The rescue plan identifies equipment, trained personnel, and procedures before work begins. It complements, rather than replaces, fall protection.

Question 25Roof Deck and Underlayment Preparation

What is the minimum nominal thickness of wood structural panel roof sheathing that is typically required before asphalt shingles are installed, per common code provisions?

  1. 5/8 inch
  2. 15/32 inch Correct answer.
  3. 3/8 inch
  4. 3/4 inch

Explanation

Most codes and shingle manufacturers require a minimum nominal 15/32-inch (or thicker) wood structural panel deck for asphalt shingle roofs, because thinner panels deflect too much and can crack shingles. The 15/32-inch figure corresponds to nominal 1/2-inch rated sheathing.

Question 26Roof Deck and Underlayment Preparation

When installing wood board (plank) roof decking, what maximum gap between boards is generally permitted under asphalt shingles?

  1. 3/4 inch
  2. 1/2 inch
  3. 1/4 inch
  4. 1/8 inch Correct answer.

Explanation

Board decks should be laid with edges tight; a small gap of about 1/8 inch is allowed for seasonal movement. Larger gaps can allow shingle deformation, fastener withdrawal, or water intrusion through the underlayment.

Question 27Roof Deck and Underlayment Preparation

A roof deck shows localized soft spots and deflection when walked. What is the correct first action before any underlayment is laid?

  1. Replace or sister the damaged decking to restore a solid surface Correct answer.
  2. Fill the soft spot with roofing cement
  3. Add a second layer of shingles over the soft spot
  4. Install underlayment over the soft area to stiffen it

Explanation

Any rotted or deflecting decking must be repaired or replaced before underlayment and shingles are installed, because shingles need a sound, flat substrate. Covering a soft spot traps the defect and leads to premature failure.

Question 28Roof Deck and Underlayment Preparation

What is the primary purpose of installing a roof underlayment beneath asphalt shingles?

  1. To increase the fire rating of the shingles
  2. To bond the shingles to the deck
  3. To level uneven decking
  4. To provide a secondary water-shedding layer and protect the deck Correct answer.

Explanation

Underlayment acts as a secondary moisture barrier that sheds water that gets past the shingles and protects the deck during installation. It does not glue shingles down or level the deck.

Question 29Roof Deck and Underlayment Preparation

Under most asphalt shingle manufacturer instructions, what is the typical minimum underlayment coverage requirement for a standard sloped roof?

  1. Only at the ridge
  2. Only in valleys
  3. One layer covering the entire deck Correct answer.
  4. Only at the eaves

Explanation

Manufacturers generally require underlayment over the entire roof deck, not just at details, so the deck is protected everywhere. Localized coverage leaves most of the deck unprotected if water infiltrates.

Question 30Roof Deck and Underlayment Preparation

When installing a standard No. 15 asphalt-saturated felt underlayment, how should the horizontal laps be positioned relative to water flow?

  1. Laps alternated direction each course
  2. Lower courses lapped over upper courses
  3. Laps butted tight with no overlap
  4. Upper courses lapped over lower courses Correct answer.

Explanation

Underlayment laps must shed water, so each upper course overlaps the course below it, with the lap oriented down-slope. This directs any water that reaches the felt toward the eave rather than under the laps.

Question 31Roof Deck and Underlayment Preparation

What is the typical minimum horizontal lap for No. 15 asphalt-saturated felt underlayment?

  1. 1 inch
  2. 2 inches Correct answer.
  3. 12 inches
  4. 6 inches

Explanation

No. 15 felt is commonly lapped a minimum of 2 inches on the sides, while heavier felts and synthetic underlayments may require more. The lap ensures the sheets overlap enough to shed water without gaps.

Question 32Roof Deck and Underlayment Preparation

Where is underlayment typically doubled (two layers) under asphalt shingles?

  1. In valleys and at the eaves Correct answer.
  2. At the rake edges only
  3. Across the entire roof field
  4. Only at the ridge vent

Explanation

Valleys and eave areas receive extra protection because they carry the greatest water concentration and are subject to ice damming. A second layer of underlayment or a dedicated valley lining is commonly required there.

Question 33Roof Deck and Underlayment Preparation

What is the purpose of installing ice dam protection membrane along the eaves in cold climates?

  1. To reflect sunlight
  2. To prevent water backup from entering the building at the eave Correct answer.
  3. To bond the shingles to the fascia
  4. To insulate the roof deck

Explanation

Ice dam membrane is a self-adhering waterproof layer placed at the eaves to stop water backed up by ice dams from penetrating the deck. It is not insulation and does not attach shingles to trim.

Question 34Roof Deck and Underlayment Preparation

When installing self-adhering ice dam membrane at the eave, how should the membrane be applied to the deck?

  1. Loose-laid without adhesion
  2. Over the finished shingles
  3. In direct contact with the primed or clean deck surface, adhered fully Correct answer.
  4. Over a layer of building paper

Explanation

Self-adhering membrane must be fully adhered to a clean, dry deck so it forms a continuous waterproof seal. It is installed before shingles, not over them, and must not be loose-laid.

Question 35Roof Deck and Underlayment Preparation

Which fastener is appropriate for securing underlayment to a wood deck before shingles are installed?

  1. Staples through the shingle area only
  2. Cap nails or approved fasteners driven through the underlayment into the deck Correct answer.
  3. Roofing cement
  4. Adhesive only

Explanation

Underlayment is fastened with cap nails or manufacturer-approved fasteners that hold it flat until shingles are installed. Adhesive or cement alone will not secure it against wind.

Question 36Roof Deck and Underlayment Preparation

What minimum roof slope generally requires a double layer of underlayment under asphalt shingles?

  1. Slopes below 2:12
  2. Slopes of 8:12 and steeper
  3. Slopes of 4:12 and steeper
  4. Slopes between 2:12 and 4:12 Correct answer.

Explanation

On low-slope roofs between 2:12 and 4:12, shingles are more vulnerable to water infiltration, so codes commonly require two layers of underlayment. Steeper roofs need only a single layer.

Question 37Roof Deck and Underlayment Preparation

On a roof with a slope below 2:12, what is the standard practice regarding asphalt shingles?

  1. Install shingles directly on the deck
  2. Do not install standard asphalt shingles; use a low-slope roofing system Correct answer.
  3. Install a double underlayment and shingle normally
  4. Install shingles with extra nails only

Explanation

Standard asphalt shingles are not intended for slopes below 2:12 because water will not shed fast enough. Such roofs require a low-slope membrane system instead.

Question 38Roof Deck and Underlayment Preparation

What is the purpose of a drip edge installed at the eave before shingles are applied?

  1. To support the shingles only
  2. To hold the underlayment down
  3. To vent the attic
  4. To direct water away from the fascia and deck edge Correct answer.

Explanation

Drip edge metal at the eave directs water off the roof edge and away from the fascia and deck, reducing rot. It also helps support the shingle overhang but its primary purpose is water diversion.

Question 39Roof Deck and Underlayment Preparation

When installing drip edge at the eave, what is the typical correct layering relative to the underlayment?

  1. Underlayment over the drip edge at the eave
  2. Drip edge over the underlayment at the eave Correct answer.
  3. Drip edge installed after the shingles
  4. Drip edge omitted at the eave

Explanation

At the eave, underlayment is typically installed first and the drip edge is placed over it so water sheds off the metal. At the rake, the order is generally reversed. This layering directs water away from the deck.

Question 40Roof Deck and Underlayment Preparation

What should be done with the deck surface immediately before installing underlayment?

  1. Cover it with plastic sheeting
  2. Clean it of debris and ensure it is dry and sound Correct answer.
  3. Apply a coat of primer
  4. Wet it to improve adhesion

Explanation

The deck must be clean, dry, and sound so the underlayment lies flat and adheres or fastens properly. Debris or moisture trapped under the felt can cause wrinkling and premature deterioration.

Question 41Roof Deck and Underlayment Preparation

What fastener length is generally appropriate for nailing underlayment to a 15/32-inch wood structural panel deck?

  1. 2-1/2 inches
  2. 7/8 inch to 1 inch Correct answer.
  3. 3 inches
  4. 1/2 inch

Explanation

Underlayment fasteners should penetrate the deck sufficiently to hold without protruding through the underside. Nails about 7/8 to 1 inch long are typical for a 15/32-inch panel.

Question 42Roof Deck and Underlayment Preparation

How should underlayment be installed at a valley before shingles are applied?

  1. Omitted entirely in the valley
  2. Installed with a gap at the valley center
  3. Run continuously across the valley with a doubled layer or valley lining Correct answer.
  4. Cut short of the valley centerline

Explanation

Valleys carry concentrated water, so underlayment should be continuous and typically doubled or supplemented with a dedicated valley lining. Leaving gaps or cutting short invites leaks.

Question 43Roof Deck and Underlayment Preparation

What is the concern with installing underlayment over a deck that has a noticeable dip or hump?

  1. It has no effect on the finished roof
  2. It increases the fire rating
  3. It improves drainage
  4. It can telegraph through and cause shingle distortion and premature wear Correct answer.

Explanation

Uneven decking can telegraph through the underlayment and shingles, causing visible distortion and stress points that shorten shingle life. The deck should be flattened or repaired before covering.

Question 44Roof Deck and Underlayment Preparation

Which underlayment is commonly used where a manufacturer requires a synthetic product rather than asphalt-saturated felt?

  1. Synthetic woven or nonwoven roof underlayment Correct answer.
  2. Housewrap
  3. Tar paper only
  4. Polyethylene vapor barrier

Explanation

Synthetic roof underlayments are engineered woven or nonwoven sheets approved for use under asphalt shingles, often lighter and more tear-resistant than felt. Housewrap and vapor barriers are not roof underlayments.

Question 45Roof Deck and Underlayment Preparation

When two layers of underlayment are required on a low-slope roof, how should the second layer be oriented?

  1. Parallel to the eave, with shingle-fashion overlaps and staggered joints, per manufacturer instructions Correct answer.
  2. Only at the rake
  3. Parallel to the first layer with laps aligned
  4. Only at the ridge

Explanation

For ordinary double-coverage underlayment on low-slope shingle roofs, courses run parallel to the eave with generous shingle-fashion overlaps and staggered joints. Upper courses lap over lower courses to shed water downslope. Follow the manufacturer's specified overlap and fastening requirements.

Question 46Roof Deck and Underlayment Preparation

What is the function of a roof deck protection product such as a peel-and-stick membrane in addition to ice dam protection?

  1. To insulate the roof
  2. To replace shingles entirely
  3. To provide structural support
  4. To serve as a waterproof secondary barrier in vulnerable areas Correct answer.

Explanation

Peel-and-stick membranes provide a waterproof secondary barrier in vulnerable areas such as eaves, valleys, and penetrations. They supplement shingles but never replace them and provide no structural or insulating value.

Question 47Roof Deck and Underlayment Preparation

A roofer is installing underlayment on a steep roof with a 10:12 slope. What fastening and lap practice is most appropriate?

  1. Underlayment omitted because the roof is steep
  2. Single layer with standard laps and approved fasteners, following manufacturer instructions Correct answer.
  3. Double layer everywhere regardless of manufacturer instructions
  4. No fasteners, relying on gravity

Explanation

On a 10:12 slope, a single layer of underlayment with standard laps and approved fasteners is generally sufficient, following the manufacturer's written instructions. Doubling everywhere is unnecessary, and omitting underlayment is never acceptable.

Question 48Roof Deck and Underlayment Preparation

What should be verified about the roof deck before installing underlayment on a re-roof where old shingles have been removed?

  1. That the deck is painted
  2. That the deck is wet to test adhesion
  3. That the deck is clean, dry, and free of protruding fasteners and rot Correct answer.
  4. That the deck is covered with plastic

Explanation

After tear-off, the deck must be inspected for protruding nails, rot, and debris, then cleaned and dried before underlayment is installed. Protrusions can puncture the underlayment and shingles, and rot compromises fastening.

Question 49Asphalt Shingle Application and Fastening

When installing asphalt shingles, what is the standard exposure for a typical three-tab shingle with a nominal 12-inch height?

  1. 4 inches
  2. 6 inches
  3. 8 inches
  4. 5 inches Correct answer.

Explanation

Standard three-tab shingles are designed around a 5-inch exposure, giving roughly 36 courses per 100 square feet of roof area when lapped correctly. Using a larger exposure reduces the number of shingle layers at any point and voids the manufacturer's wind and weather warranty.

Question 50Asphalt Shingle Application and Fastening

Where should fasteners be placed on a standard three-tab shingle?

  1. At the very edge of each shingle tab
  2. In the common bond area just above the exposure line Correct answer.
  3. Through the exposure area so heads are visible
  4. Above the nail line near the top edge of the shingle

Explanation

Fasteners belong in the nailing zone, which sits just above the exposure line within the common bond area so each nail passes through the underlying shingle as well. Nailing in the exposure area or too high leaves the shingle vulnerable to wind uplift and may puncture the visible surface.