Practice Exam Questions And Correct

Low-Slope Roofing Installer Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What minimum slope is typically required for a low-slope roof?

A. 1/4:12

B. 1/2:12

C. 2:12

D. 3:12

Rationale: A slope of at least 1/2:12 improves drainage beyond the absolute minimum and is widely accepted for performance in low-slope systems.

• Which membrane type is most resistant to UV exposure?
• SBS-modified bitumen
• APP-modified bitumen 1 / 4

C. EPDM

D. BUR

Rationale: EPDM is highly UV-resistant due to its synthetic rubber

composition.

• What is the primary purpose of roof insulation?
• Aesthetic appeal
• Waterproofing
• Thermal resistance
• Fire stopping

Rationale: Insulation reduces heat transfer and improves energy efficiency.

• Which fastener pattern best prevents wind uplift?
• Random spacing
• Horizontal only
• Vertical only
• Grid pattern

Rationale: A grid distributes loads evenly and increases uplift resistance.

• What is the typical thickness of a single-ply membrane?
• 10–20 mil
• 40–90 mil
• 120–150 mil
• 200 mil 2 / 4

Rationale: Commercial single-ply membranes commonly fall within this

thickness range.

• Which component protects the membrane from foot-traffic damage?
• Vapor barrier
• Fasteners
• Walk pads
• Primer

Rationale: Walk pads provide a reinforced surface for traffic areas.

• What does a vapor barrier primarily control?
• Wind
• Rainwater
• UV light
• Moisture diffusion

Rationale: Vapor barriers limit moisture migration from inside the building.

• Which adhesive is used most often for EPDM adhered systems?
• Hot asphalt
• Contact cement
• Silicone
• Latex glue

Rationale: EPDM membranes are typically applied with contact adhesives

for secure bonding.

• In BUR systems, what is the purpose of surfacing? 3 / 4

• Increase membrane thickness
• Protect from UV and weathering
• Fireproofing
• Insulation

Rationale: Surfacing shields bitumen from degradation.

• Which tool is required for hot-air welding TPO seams?
• Roller only
• Heat welder and roller
• Torch
• Water sprayer

Rationale: Hot-air welding requires heat application and pressure to fuse

seams.

• What is the function of cover boards?
• Primary waterproofing
• Decoration
• Fire suppression
• Surface protection and improved substrate stability

Rationale: Cover boards improve durability, impact resistance, and

attachment quality.

12. Proper drainage on a low-slope roof is generally achieved with:

• Scuppers only
• Gutters only
• / 4