NRCA ProCertified EPDM Installer

What does the acronym EPDM stand for in roofing membrane systems?

• AEthylene Propylene Diene Monomer
• BExpanded Polymer Deck Membrane
• CElastomeric Protective Dual-ply Membrane
• DEthylene Polymer Durable Material

According to ASTM D4637, what are the three standard thicknesses available for EPDM single-ply membranes?

• A30-mil, 45-mil, and 60-mil
• B45-mil, 60-mil, and 90-mil
• C60-mil, 75-mil, and 90-mil
• D45-mil, 75-mil, and 100-mil

What is the primary function of a bonding adhesive in a fully adhered EPDM roofing system?

• ATo seal the seams between adjacent membrane sheets
• BTo adhere the membrane continuously to the substrate across the entire field
• CTo prime the membrane surface before applying seam tape
• DTo bond insulation boards to the roof deck

In a mechanically attached EPDM system, batten bars are typically placed at what interval across the field?

• AAt every 2 feet on center
• BOnly at the perimeter edges
• CAt lap seams and intermediate rows per the project-specific uplift design
• DAt every insulation board joint only

What is the minimum recommended ballast weight per square foot for a ballasted EPDM roofing system to resist wind uplift under standard conditions?

• A5 lb/sf
• B8 lb/sf
• C10 lb/sf
• D15 lb/sf

What type of ballast material is specified in the NRCA Roofing Manual as appropriate for ballasted EPDM systems?

• ACrushed limestone screenings
• BLoose river rock (washed gravel)
• CPea gravel mixed with sand
• DPrecast concrete pavers only

What is the standard width of EPDM seam tape used for factory-made or field-made laps in single-ply EPDM systems?

• A2-inch and 4-inch widths
• B3-inch and 6-inch widths
• C4-inch and 8-inch widths
• D6-inch and 9-inch widths

Why must seam primer be applied to EPDM membrane surfaces before applying seam tape?

• ATo add color for quality control inspection
• BTo clean and prepare the membrane surface to improve seam tape adhesion
• CTo vulcanize the membrane at the seam location
• DTo replace the need for T-joint patches

What is the difference between cured and uncured EPDM flashing material?

• ACured flashing is used in field seams; uncured flashing is used only at drains
• BUncured EPDM is pliable and can be stretched around complex details; cured EPDM is vulcan…
• CCured EPDM comes only in black; uncured EPDM comes in white only
• DThere is no functional difference; the terms are interchangeable

When and why is a T-joint patch required in an EPDM roofing system?

• AAt every lap seam, regardless of configuration
• BOnly at drain locations
• CWherever three or more membrane sheets or pieces intersect to prevent water intrusion at…
• DOnly on mechanically attached systems, not fully adhered systems

Which of the following best describes proper deck preparation before installing EPDM roofing?

• AThe deck must be swept clean and any projections ground flush or covered
• BOnly structural deficiencies need correction; surface contamination does not affect EPDM…
• CThe deck must be wet to activate the bonding adhesive properly
• DSurface preparation is only required for mechanically attached systems

What is the primary purpose of roof insulation placed beneath an EPDM membrane?

• ATo add structural strength to the roof assembly
• BTo provide thermal resistance, reduce energy loss, and create a stable substrate for the…
• CTo serve as a vapor retarder only
• DTo increase the dead load capacity of the roof system

What is the minimum temperature at which solvent-based bonding adhesive can be effectively applied in cold weather?

• A50°F (10°C)
• B32°F (0°C)
• C60°F (15.5°C)
• D40°F (4.5°C)

What problem can occur when bonding adhesive is applied in temperatures below the manufacturer's minimum and how does it manifest?

• AThe adhesive turns white and is cosmetically unacceptable only
• BThe adhesive does not flash off properly, resulting in poor bond strength and membrane bl…
• CThe adhesive bonds too quickly, making installation difficult
• DCold temperature adhesive application causes membrane shrinkage

When installing an EPDM pipe boot penetration detail using uncured flashing, what material is wrapped around the pipe?

• ACured EPDM secured with metal clamps
• BUncured EPDM stretched and molded around the pipe, secured with seam tape and a stainless…
• CA pre-molded TPO boot
• DNeoprene collar only, without any EPDM

How are inside corners treated in EPDM roofing to prevent membrane bridging and stress?

• AThe membrane is cut and folded at inside corners without additional material
• BA cant strip is installed and uncured EPDM flashing is used to fill the corner, providing…
• CInside corners require no special treatment as EPDM is flexible enough
• DA metal corner piece is installed before the membrane

What is the proper method for terminating an EPDM membrane at a roof drain?

• AThe membrane is simply cut to the drain opening and pressed flat
• BThe membrane extends into the drain bowl and is clamped by the drain clamping ring, with…
• CThe membrane terminates 6 inches from the drain and is covered with uncured flashing
• DThe membrane is adhered to the drain body using bonding adhesive only, without mechanical…

What ANSI/SPRI standard governs the design and installation of edge metal at the perimeter of EPDM low-slope roofing systems?

• AASTM D4637
• BANSI/SPRI ES-1
• COSHA 1926 Subpart M
• DNFPA 13

Which OSHA standard covers fall protection requirements for workers performing EPDM roofing installation?

• AOSHA 1910 Subpart D
• BOSHA 1926 Subpart M
• COSHA 1926 Subpart Q
• DOSHA 1926 Subpart L

On low-slope roofs, OSHA allows what specific fall protection alternative to personal fall arrest systems for roofing workers working more than 6 feet from the roof edge?

• ASafety monitor system without any other protection
• BWarning line system set back at least 6 feet from the roof edge, used in combination with…
• CRoof brackets and rope grabs only
• DA perimeter rope system at knee height

What is the purpose of a vapor retarder in an EPDM roofing assembly?

• ATo increase the fire resistance rating of the roof assembly
• BTo control vapor diffusion from the interior into the insulation layer, reducing the risk…
• CTo serve as the primary waterproofing layer
• DTo prevent membrane shrinkage

Why is it important to allow EPDM bonding adhesive to flash off (dry) before pressing the membrane into place?

• ATo allow the adhesive to change color so the applicator can see coverage
• BTo allow solvents to evaporate so the adhesive becomes tacky and forms an aggressive cont…
• CTo give the adhesive time to cure and harden completely before the membrane is applied
• DFlash-off time is not critical; the membrane can be laid immediately after adhesive appli…

What is the appropriate ballast wind-uplift design strategy for EPDM roof edges and corners compared to the field of the roof?

• AEdges and corners use the same ballast weight as the field of the roof
• BEdges and corners require increased ballast weight or supplemental mechanical attachment…
• CEdges and corners require less ballast because they drain more efficiently
• DWind uplift is uniform across the entire roof surface

How should the EPDM field membrane be handled to avoid membrane movement after installation in a fully adhered system?

• AThe membrane should be stretched tight during installation to pre-tension it
• BThe membrane should be relaxed and allowed to lie flat without stretching before adhesive…
• CMembrane handling does not affect post-installation performance
• DThe membrane should be installed in rolls without unfolding first

What is a field seam in EPDM roofing, and how is it typically made?

• AA factory splice made at the manufacturing plant using vulcanization
• BAn overlap seam made at the job site by lapping adjacent membrane sheets and bonding with…
• CA seam created only at the perimeter of the roof using metal edge bars
• DA temporary connection that is later replaced with a permanent welded seam

What minimum overlap width is typically required at EPDM field seams according to NRCA guidelines?

• A1 inch
• B2 inches
• C3 inches
• D6 inches

What is the NRCA ProCertification program designed to accomplish?

• ATo license roofing companies as general contractors
• BTo certify individual roofing workers as competent in specific roofing systems through wr…
• CTo certify that a roofing company has liability insurance
• DTo train safety monitors for fall protection only

Which of the following conditions would cause a fully adhered EPDM system to be rejected during quality control inspection?

• AWrinkles larger than 1 inch in the field of the membrane
• BAll seams fully bonded with seam tape and primer visible along the seam edge
• CMembrane rolls stored flat on the roof deck overnight
• DT-joint patches installed at all three-way membrane intersections

What is the purpose of a membrane termination bar at roof-to-wall or curb flashings in an EPDM system?

• ATo provide a decorative finish at wall and curb tops
• BTo mechanically secure and waterproof the upper edge of the EPDM flashing material agains…
• CTo serve as a lightning protection termination point
• DTo indicate the required membrane lap width

What is lap sealant used for in EPDM roofing installations?

• ATo bond the field membrane to the insulation
• BTo seal the exposed edge of seam tape and termination bars to prevent edge lifting and wa…
• CTo replace seam tape when tape is unavailable on-site
• DTo prime the membrane surface before seam tape application

When installing EPDM on a roof with large areas of ponded water (positive drainage not achieved), what is the primary concern?

• AEPDM membranes are completely intolerant of standing water and will degrade immediately
• BProlonged ponding can cause insulation compression, promote biological growth, and increa…
• CPonding water has no effect on EPDM systems
• DStanding water is beneficial because it ballasts the membrane without requiring loose bal…

What is the difference between reinforced and non-reinforced EPDM membranes?

• AReinforced EPDM contains a polyester or fiberglass scrim, improving dimensional stability…
• BReinforced EPDM is thicker than 90-mil and used only on steep-slope roofs
• CReinforced EPDM contains metal wire mesh for lightning protection
• DThere is no difference; all EPDM is manufactured with reinforcement

What is the minimum height of EPDM flashing at curbs and vertical walls above the finished roof membrane surface per NRCA guidelines?

• A2 inches
• B4 inches
• C8 inches
• D12 inches

Which property makes EPDM membranes particularly resistant to weathering and UV radiation compared to some other roofing materials?

• AThe presence of carbon black pigment, which absorbs UV radiation and provides oxidation r…
• BIts white color, which reflects UV radiation
• CThe synthetic rubber is fully vulcanized before installation
• DEPDM contains fiberglass reinforcement that blocks UV penetration

What action must be taken when cutting EPDM membrane sheets for installation around a penetration such as a pipe or conduit?

• AThe cut edge of the field membrane must be sealed with lap sealant to prevent edge wicking
• BCut edges do not require special treatment; EPDM does not absorb moisture
• CCut edges must be heat-welded to prevent delamination
• DCut edges must be coated with bonding adhesive and allowed to cure for 24 hours

In a mechanically attached EPDM system, what role do fasteners play in the batten bar attachment?

• AFasteners are only used at the perimeter; the field relies entirely on membrane weight
• BFasteners penetrate through the batten bar, membrane, and insulation into the structural…
• CFasteners are applied only to the membrane surface without penetrating the deck
• DFasteners hold the insulation boards together horizontally

What is a common cause of EPDM seam failures in the field, and how can it be prevented?

• AApplying seam tape in cold weather above 60°F
• BInsufficient seam primer application, inadequate roller pressure, or contaminated membran…
• CUsing 6-inch tape instead of 3-inch tape
• DApplying too much seam primer, which softens the tape

What is the recommended practice for EPDM membrane installation in relation to roof slope?

• AEPDM should only be installed on perfectly flat roofs with no slope
• BEPDM can be installed on low-slope roofs (typically 1/4-inch per foot to 3 inches per foo…
• CEPDM is exclusively for steep-slope roofing above 4:12
• DEPDM cannot be used on slopes greater than 1/2-inch per foot

When EPDM membrane is used as base flashing at a wall, what must the membrane be bonded to for secure attachment?

• AThe exterior face of the wall only
• BBoth the horizontal roof field membrane and the vertical surface of the wall or curb, usi…
• COnly the horizontal field membrane; the vertical portion hangs freely
• DThe metal flashing cap only

What type of fastener is typically specified for securing batten bars in mechanically attached EPDM systems into steel decking?

• AWood screws
• BSelf-drilling or self-tapping screws with plates designed for metal deck attachment
• CSpiral shank nails
• DMasonry anchors

What is the NRCA Roofing Manual's recommended minimum pitch for positive drainage on EPDM roofs?

• A1/8-inch per foot
• B1/4-inch per foot
• C1/2-inch per foot
• D1-inch per foot

What is the purpose of applying a hand roller over an EPDM seam after seam tape installation?

• ATo flatten any surface bubbles in the membrane field
• BTo apply firm, uniform pressure that ensures complete contact between the seam tape adhes…
• CTo spread the seam primer evenly before tape application
• DTo stretch the seam tape to its final width

Under OSHA regulations, what is the minimum height above a lower level at which fall protection is required for roofing construction workers?

• A4 feet
• B6 feet
• C8 feet
• D10 feet

What is the role of cover tape (also called overlap tape or seam tape) at factory seams in EPDM sheeting?

• AFactory seams are welded and do not require any tape
• BCover tape is applied at the factory over the seam created when two rubber strips are joi…
• CCover tape is a decorative element indicating the seam location
• DCover tape replaces the need for field seam primer at factory seams

How does EPDM's coefficient of thermal expansion affect its installation?

• AEPDM does not expand or contract with temperature changes
• BEPDM expands and contracts with temperature; membranes must be installed with appropriate…
• CEPDM only expands in summer and must be installed only in winter
• DEPDM has such a small coefficient of expansion that it can be installed fully tensioned w…