Exam Questions And Correct Answers

CA D66 Waterproofing Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the primary purpose of a waterproofing membrane in building

construction?

• Provide structural support
• Prevent water penetration
• Insulate against heat
• Improve aesthetics
• Prevent water penetration

Rationale: Waterproofing membranes are designed to prevent water from

entering the structure, protecting materials from moisture damage.

• Which of the following materials is most commonly used for liquid-

applied waterproofing?

• Polyurethane
• Concrete
• Asphalt shingles
• Gypsum board
• Polyurethane

Rationale: Polyurethane is flexible, durable, and commonly used in liquid-

applied waterproofing systems for roofs and balconies.

• When installing a below-grade waterproofing system, what is critical to

ensure proper performance?

• Adequate slope and drainage 1 / 3

• Bright color coating
• Thick insulation
• Use of decorative tiles
• Adequate slope and drainage

Rationale: Proper drainage prevents water accumulation and hydrostatic

pressure, which can compromise the waterproofing system.

• What is the main cause of blistering in waterproofing membranes?
• Excess sunlight
• Trapped moisture or air
• Low temperature
• Incorrect membrane color
• Trapped moisture or air

Rationale: Blisters form when air or water vapor is trapped under the

membrane during installation.

• Which of the following is a common method for testing waterproofing

installations?

• Tensile strength test
• Water ponding test
• Thermal conductivity test
• Paint adhesion test
• Water ponding test

Rationale: The water ponding test assesses the membrane’s ability to resist

water penetration over a set period.

6. In sheet membrane waterproofing, seams must be:

• Left loose
• Mechanically fastened only
• Properly bonded or welded
• Painted over
• Properly bonded or welded

Rationale: Properly bonding seams ensures the membrane is continuous

and watertight. 2 / 3

• What is the role of a primer in waterproofing applications?
• Add decorative color
• Improve adhesion of membrane to substrate
• Increase thermal insulation
• Reduce structural weight
• Improve adhesion of membrane to substrate

Rationale: Primers prepare the surface and enhance adhesion of

waterproofing materials to substrates.

• Which type of waterproofing is most suitable for flat roofs?
• Sheet membranes or liquid-applied systems
• Gypsum board
• Paint coatings
• Ceramic tiles
• Sheet membranes or liquid-applied systems

Rationale: These systems provide continuous coverage and durability for

flat roof surfaces where water may pond.

• What is hydrostatic pressure in relation to waterproofing?
• Pressure caused by wind
• Pressure caused by water accumulation
• Pressure caused by heat expansion
• Pressure from structural load
• Pressure caused by water accumulation

Rationale: Hydrostatic pressure occurs when water builds up against a

surface, requiring effective waterproofing to resist penetration.

• Which of the following is a characteristic of self-adhered

bituminous sheet membranes?

• Requires heat welding
• Has a sticky backing for adhesion
• Only for decorative purposes
• Not suitable for roofs
• / 3