NRCA ProCertified Modified Bitumen Installer

Which type of modified bitumen membrane uses styrene-butadiene-styrene polymer for modification?

• AAPP (atactic polypropylene)
• BSBS (styrene-butadiene-styrene)
• CBUR (built-up roofing)
• DEPDM (ethylene propylene diene monomer)

What application method is typically used for APP modified bitumen membranes?

• ACold-adhesive bonding
• BHot asphalt mopping
• CTorch application
• DSelf-adhering peel-and-stick

ASTM D6162 governs which modified bitumen membrane product?

• AAPP torch-applied cap sheets
• BSBS-modified bitumen sheets using a combination of reinforcements
• CAPP granule-surfaced cap sheets
• DSBS self-adhering base sheets

What ASTM standard covers APP torch-applied granule-surfaced cap sheets?

• AASTM D6163
• BASTM D6164
• CASTM D6222
• DASTM D4601

What ASTM standard governs asphalt-coated glass fiber base sheets used under modified bitumen systems?

• AASTM D6162
• BASTM D4601
• CASTM D6223
• DASTM D6164

What NRCA certification is required before applying torch-applied modified bitumen membranes?

• ANRCA CertifiedPro
• BNRCA CERTA (Certified Roofing Torch Applicator)
• COSHA 30-Hour Construction
• DFM Global Approved Installer

How long must a fire watch be maintained after torch work is completed on a modified bitumen roof?

• A30 minutes
• B1 hour
• C2 hours
• D4 hours

What is the minimum ambient temperature requirement for heat-welding seams on APP modified bitumen membranes?

• A0°F (−18°C)
• B12°F (−11°C)
• C32°F (0°C)
• D40°F (4°C)

In a two-ply modified bitumen assembly, what is the role of the base sheet (ply sheet)?

• AProvide the UV-resistant, weather-exposed surface
• BAct as the vapor retarder above the structural deck
• CProvide the first layer of waterproofing and a substrate for the cap sheet
• DServe as the primary fire-rated barrier under code

What granulated surface is typically found on the exposed cap sheet of an SBS or APP modified bitumen system?

• ACeramic-coated mineral granules
• BSmooth bitumen coating
• CSand-surfaced film
• DAluminum foil facing

Hot asphalt used in SBS modified bitumen mop-applied systems should be maintained at what kettle temperature range?

• A300–350°F (149–177°C)
• B350–400°F (177–204°C)
• C450–500°F (232–260°C)
• D550–600°F (288–316°C)

Which OSHA standard primarily governs fall protection requirements for roofing workers?

• A29 CFR 1926 Subpart M
• B29 CFR 1926 Subpart P
• C29 CFR 1910 Subpart D
• D29 CFR 1926 Subpart Q

What is the purpose of a base flashing in a modified bitumen roofing system?

• ATo provide additional drainage capacity at the eave
• BTo seal the vertical transition from the roof membrane to a wall or curb
• CTo protect insulation boards from UV degradation
• DTo mechanically fasten the cap sheet at perimeter edges

Counter flashings are typically made of which material and serve what purpose?

• AModified bitumen; they extend the base flashing up the wall
• BMetal; they cap and protect the top edge of the base flashing
• CEPDM; they bridge the gap between the roof and wall
• DFiberglass; they reinforce the base flashing at parapet walls

ANSI/SPRI ES-1 establishes requirements for which roofing component?

• ADrainage sumps and overflow scuppers
• BEdge metal fascia, coping, and gravel stop systems
• CRooftop HVAC equipment curbs
• DModified bitumen seam strength testing

What is the primary hazard that makes asphalt kettle safety critical on a modified bitumen roofing project?

• AExcessive weight loading on the roof deck
• BVolatile fume release and fire risk from overheated asphalt
• CSlippery surfaces created by asphalt spills
• DNoise levels that exceed OSHA hearing protection thresholds

FM Global wind uplift standards FM 1-29 and FM 1-49 pertain to which aspect of a modified bitumen roofing system?

• AFire resistance ratings of modified bitumen assemblies
• BWind uplift performance of insulation and membrane attachment
• CHail impact resistance classifications
• DThermal resistance (R-value) requirements for roofing insulation

What is the function of a cover board in a modified bitumen roofing assembly?

• ATo serve as the finished interior ceiling surface
• BTo protect foam insulation from torch heat and provide a firm substrate for the membrane
• CTo provide structural spanning capability across joists
• DTo act as the primary drainage layer under the membrane

When installing modified bitumen membrane at a roof drain, what detail is critical to prevent water backup?

• AStripping the membrane back 12 inches from the drain bowl
• BInstalling a secondary (overflow) drain at the same elevation as the primary drain
• CExtending the membrane beneath the drain flange and securing with the clamping ring
• DCoating the drain bowl with asphaltic primer before the membrane is installed

What minimum PPE is required when working with hot asphalt (mopping) on a modified bitumen roof?

• AHard hat and steel-toed boots only
• BHeat-resistant gloves, long sleeves, safety glasses, and appropriate footwear
• CFull chemical-resistant suit and SCBA respirator
• DOnly a standard construction vest and hard hat per OSHA general requirements

What is the typical lap (side lap) requirement for modified bitumen sheet courses in a field installation?

• A1 inch minimum
• B2 inches minimum
• C3–4 inches minimum
• D6 inches minimum

When installing modified bitumen roofing in cold weather (below 50°F), which precaution is most important for SBS membranes installed by cold adhesive?

• AUsing a propane torch to supplement cold-adhesive bonding
• BWarming rolls to improve flexibility and adhesive viscosity before installation
• CDoubling the number of plies to compensate for reduced adhesive strength
• DUsing APP instead of SBS to avoid cold-weather installation restrictions

Which type of insulation board is most commonly used directly under modified bitumen membranes as the primary insulation layer?

• AExpanded polystyrene (EPS) without a cover board
• BPolyisocyanurate (polyiso) foam board
• CMineral wool board
• DFiberglass batt insulation

What is the correct sequence for a two-ply modified bitumen system installation on a steel deck?

• ACap sheet → base sheet → insulation → primer → deck
• BDeck → insulation → base sheet (ply sheet) → cap sheet
• CDeck → cap sheet → insulation → base sheet
• DInsulation → deck → base sheet → cap sheet

What is the main difference between SBS and APP modified bitumen in terms of low-temperature flexibility?

• AAPP is more flexible at low temperatures than SBS
• BSBS is more flexible at low temperatures due to its elastomeric rubber modifier
• CBoth perform identically at low temperatures
• DNeither APP nor SBS is suitable for use in cold climates

What is the purpose of priming a concrete or masonry substrate before applying modified bitumen base flashing?

• ATo increase the R-value of the assembly
• BTo seal surface pores and improve adhesion of the modified bitumen
• CTo provide fire resistance at the vertical surface
• DTo replace the need for a counter flashing at the wall

Which direction should modified bitumen membrane sheets be installed relative to roof drainage?

• APerpendicular to the direction of water flow, with laps running up-slope
• BParallel to the direction of water flow, with all laps on the high side
• CPerpendicular to water flow, with up-slope sheets lapping over down-slope sheets
• DDirection does not matter for waterproofing performance

What does a properly heat-welded torch seam on an APP membrane look like upon inspection?

• AA clean, dry edge with no visible bitumen bleed-out
• BA small, continuous bead of bitumen bleed-out along the seam edge
• CA charred or blackened line indicating sufficient heat
• DNo visible change — correct welding is invisible to the naked eye

What is the purpose of staggering end laps in a modified bitumen two-ply system?

• ATo reduce material waste during installation
• BTo prevent alignment of weak points and improve waterproofing redundancy
• CTo improve aesthetic appearance of the finished roof
• DTo allow faster installation by reducing the number of cuts

What is the primary advantage of a self-adhering (peel-and-stick) SBS modified bitumen membrane?

• AHigher wind uplift resistance than torched or mopped systems
• BElimination of open-flame or hot asphalt, reducing fire risk during installation
• CBetter UV resistance than granulated cap sheets
• DLower cost per square foot than torch-applied APP membranes

When is a hot-work permit required for modified bitumen torch work?

• AOnly when working within 35 feet of fuel storage
• BOnly when working on occupied buildings
• CWhenever open-flame torch equipment is used on a roofing project
• DOnly when required by the general contractor, not by code

What is the minimum height that base flashings must extend up a vertical surface per NRCA guidelines?

• A4 inches
• B6 inches
• C8 inches
• D12 inches

What does 'wicking' mean in the context of modified bitumen roofing membrane installation?

• AMoisture absorbed into the reinforcing mat of the membrane
• BWater channeling under the membrane through an inadequately sealed seam
• CFlame tracking along the underside of the membrane during torch application
• DBitumen migration to the surface of the cap sheet in hot weather

What is the purpose of a T-patch (T-lap) at the intersection of end laps and side laps in modified bitumen work?

• ATo reinforce the membrane at points where three layers converge
• BTo mark the location of the lap for quality inspection
• CTo provide additional granule coverage at transition points
• DTo create a drainage channel at the intersection

When a modified bitumen roofing system is to be installed over an existing BUR (built-up roofing) system, what condition must be confirmed first?

• AThe BUR system must be at least 5 years old before re-roofing
• BThe existing system must be dry (no trapped moisture) and structurally sound
• CThe BUR must be removed — re-roofing over existing membranes is prohibited
• DA new vapor retarder must be installed over the BUR before the new system

What is the purpose of a field seam probe test for torch-applied modified bitumen membranes?

• ATo measure the thickness of the installed membrane
• BTo verify seam adhesion by attempting to separate the lap with a probe or putty knife
• CTo check the temperature of the membrane surface post-installation
• DTo locate drains hidden beneath granules

In modified bitumen roofing, what does the term 'interply' refer to?

• AThe granulated surface layer of the cap sheet
• BAny sheet between the base sheet and cap sheet in a multi-ply assembly
• CThe adhesive used between the insulation and base sheet
• DThe metal edge termination at the perimeter

Why is it important to back-nail (mechanically fasten) the base sheet at the upper lap area in a mop-applied modified bitumen system on a sloped substrate?

• ATo prevent the sheet from curling during hot weather
• BTo resist wind uplift forces and prevent slippage down the slope during installation
• CTo eliminate the need for a hot-asphalt bond on the bottom of the sheet
• DTo comply with manufacturer warranty requirements for flat roofs

What PPE should be worn when using a propane torch for APP modified bitumen installation?

• ANo special PPE is required beyond standard construction gear
• BWelding helmet, asbestos gloves, and full fire suit
• CSafety glasses/goggles, leather gloves, long sleeves, leather boots, and nearby fire exti…
• DChemical respirator, chemical-resistant gloves, and face shield

What does NRCA's ProCertified Modified Bitumen Installer credential specifically verify?

• AThat the installer has passed the OSHA 10-hour safety course
• BThat the installer has demonstrated competency in modified bitumen roofing installation t…
• CThat the installer is approved to apply FM-rated roofing systems
• DThat the installer holds a valid state roofing contractor license

What is the primary reason granule-surfaced cap sheets are used on modified bitumen roofing systems?

• ATo add structural strength to the membrane assembly
• BTo protect the bitumen from UV degradation and provide weather and fire resistance
• CTo increase the R-value of the overall roofing assembly
• DTo allow water to drain more efficiently across the roof surface

What is a 'bleed sheet' and when is it used in modified bitumen roofing?

• AAn additional base ply applied over wet insulation to absorb trapped moisture
• BA perforated venting base sheet used to allow trapped moisture vapors to escape
• CA sacrificial sheet placed under the torch flame to prevent insulation damage
• DA slip sheet between old and new roofing to prevent bonding during re-roofing

Which polyester-reinforced SBS modified bituminous sheet standard does ASTM D6164 cover?

• ASBS sheets with glass fiber reinforcement only
• BSBS sheets with combined glass and polyester reinforcement
• CSBS sheets with polyester reinforcement only
• DAPP sheets with polyester reinforcement

What does 'softening point' indicate for a modified bitumen membrane?

• AThe temperature at which the membrane can be unrolled without cracking
• BThe temperature at which the bitumen softens sufficiently to bond under heat welding
• CThe temperature at which the membrane loses all tensile strength
• DThe temperature at which the membrane reaches its maximum elongation

What material is typically used for pipe penetration flashings in modified bitumen roofing systems?

• ACopper sheet formed to cover the pipe
• BPreformed lead or neoprene pipe boot with a modified bitumen collar
• CStandard drywall compound applied around the pipe
• DHydraulic cement formed in a cone around the pipe base

In which condition is a propane torch most likely to cause a 'flashback' fire when applying APP modified bitumen?

• AWhen the torch flame is too small and the membrane too cold
• BWhen the torch contacts the underside of the membrane, igniting vapors that travel back t…
• CWhen the ambient temperature is above 90°F
• DWhen the membrane is installed over a concrete deck

What is the function of an overflow (secondary) drain in a modified bitumen roofing system?

• ATo drain condensation from rooftop HVAC equipment
• BTo provide emergency drainage if the primary drain becomes blocked, preventing structural…
• CTo improve drainage speed on large roof areas
• DTo meet energy code requirements for roof drainage