Installer EPDM Exam Practice Questions

NRCA ProCertification Roof System Installer EPDM Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What does EPDM stand for?
• Ethylene Propylene Diene Monomer
• Ethylene Polypropylene Diethylene Membrane
• Ethyl Propyl Diene Material
• Ethylene Polyester Diene Monomer
• Ethylene Propylene Diene Monomer

Rationale: EPDM is a synthetic rubber membrane commonly used in

low-slope roofing systems.

• What is the primary function of an EPDM roofing membrane?
• Provide structural support 1 / 4

• Serve as a weatherproof barrier
• Act as insulation
• Protect against fire
• Serve as a weatherproof barrier

Rationale: EPDM is designed to prevent water infiltration and protect

the building envelope.

• What is the typical thickness range of an EPDM membrane?
• 30–45 mils
• 45–60 mils
• 45–90 mils
• 100–150 mils
• 45–90 mils

Rationale: EPDM membranes are commonly manufactured in 45, 60,

or 90 mil thicknesses, depending on application.

• Which roof deck type is generally suitable for fully adhered EPDM

installations?

• Steel
• Concrete
• Plywood or wood fiber
• All of the above
• All of the above

Rationale: EPDM can be fully adhered to a variety of structurally

sound roof decks with appropriate adhesives. 2 / 4

• What type of adhesive is typically used for fully adhered EPDM

systems?

• Water-based
• Solvent-based contact cement
• Hot asphalt
• Coal tar pitch
• Solvent-based contact cement

Rationale: Solvent-based adhesives provide a strong bond between

EPDM and the substrate.

• What is the minimum recommended slope for an EPDM roof to ensure

proper drainage?

A. 0.25%

• 1/4 inch per foot
• 1/2 inch per foot
• 2 inches per foot
• 1/4 inch per foot

Rationale: A minimum slope of 1/4 inch per foot is required to

prevent ponding water.

• When installing a mechanically fastened EPDM system, what is the

typical fastener spacing?

• 6–8 inches
• 12–18 inches
• 24 inches 3 / 4

• 36 inches
• 12–18 inches

Rationale: Fasteners are typically spaced 12–18 inches apart to

secure the membrane while allowing for expansion and contraction.

• What is a primary advantage of a fully adhered EPDM system over a

mechanically attached system?

• Lower cost
• Improved wind uplift resistance
• Easier installation
• Requires fewer accessories
• Improved wind uplift resistance

Rationale: Fully adhered systems bond directly to the substrate,

providing superior resistance to wind uplift.

• What tool is commonly used to ensure proper adhesion of EPDM in

fully adhered installations?

• Heat gun
• Roller
• Hammer
• Trowel
• Roller

Rationale: A weighted roller is used to press the membrane into the

adhesive to ensure full contact and adhesion.

• / 4