CTI Surface Preparation & Adhesives 2

Question 1

What is the maximum allowable moisture vapor emission rate (MVER) for a concrete slab before installing a moisture-sensitive adhesive?

Accepted Answer

5 lbs/1000 sq ft/24 hrs

Answer

ANSI A108.02 limits MVER to 5 lbs per 1,000 sq ft per 24 hours for moisture-sensitive adhesives.

Question 2

When installing cement board over wood subfloors, which fastener pattern is required by ANSI standards?

Accepted Answer

6 inches on edges, 12 inches in the field

Answer

ANSI A108.11 requires screws or nails 6 inches on center at edges and 12 inches in the field for cement board.

Question 3

A glass mat gypsum backer board is best suited for which application?

Accepted Answer

Wall tile in wet areas

Answer

Glass mat gypsum backer boards are designed for wall tile in wet areas but are not recommended for steam rooms or submerged conditions.

Question 4

Which test method uses a hood and calcium chloride crystals to measure concrete slab moisture emission?

Accepted Answer

Calcium chloride test (ASTM F1869)

Answer

ASTM F1869 is the calcium chloride test that measures moisture vapor emission rate (MVER) from concrete slabs.

Question 5

Organic mastic adhesive (Type I) should NOT be used in which situation?

Accepted Answer

Continuously wet areas like showers

Answer

Organic mastic adhesives are not waterproof and must never be used in continuously wet or submerged areas.

(CTI) Certified Tile Installer Practice Test