Tile Contractor Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a backer board in tile installation?
A. To act as the finished surface
B. To provide a waterproof layer
C. To provide a stable, flat surface for tile adhesion
D. To reduce sound transmission
Rationale: Backer boards provide a firm, stable substrate that helps
prevent cracking of tiles over time.
2. What is the standard thickness for most cement backer boards used in
residential tile installations?
A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 3/4 inch
,Rationale: 1/2 inch is the most common thickness for cement backer
boards in floor and wall applications.
3. Which trowel notch size is generally recommended for 12x12 inch
ceramic floor tile?
A. 1/4 inch square notch
B. 3/8 inch square notch
C. 1/2 inch square notch
D. 5/8 inch square notch
Rationale: Larger tiles require more adhesive coverage; 1/2 inch square
notch trowels provide adequate coverage for 12x12 tiles.
4. What is the main function of grout in tile installation?
A. To support the tile
B. To fill gaps between tiles and provide a finished look
C. To waterproof the floor
D. To act as a backer board
Rationale: Grout fills joints between tiles, preventing debris accumulation
and providing structural stability.
5. Which type of tile is most appropriate for high-moisture areas like
showers?
A. Vinyl
B. Porcelain or ceramic
, C. Laminate
D. Hardwood
Rationale: Porcelain and ceramic tiles are water-resistant and durable,
making them ideal for wet areas.
6. What is the recommended spacing for standard 12x12 inch floor tiles?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
D. 1/2 inch
Rationale: A 1/4 inch joint allows for proper grout placement and
accommodates minor expansion.
7. What is the best method for cutting large-format porcelain tiles?
A. Hand tile cutter
B. Wet saw
C. Utility knife
D. Scoring tool
Rationale: Wet saws provide clean, precise cuts for dense porcelain tiles.
8. Which is a characteristic of natural stone tiles compared to ceramic
tiles?
A. Less porous
B. More porous and requires sealing
, C. Cannot be polished
D. Always uniform in size
Rationale: Natural stone is generally porous and often requires sealing to
prevent staining.
9. When installing tile on a floor over a wood subfloor, which method is
preferred?
A. Directly on plywood with mastic
B. Using cement backer board over the wood subfloor
C. Floating floor method
D. Gluing tile to wood without preparation
Rationale: Cement backer board over wood prevents movement and
cracking of tiles.
10. Which adhesive is commonly recommended for exterior tile
installations?
A. Mastic
B. Thin-set mortar rated for exterior use
C. Epoxy glue
D. Construction adhesive
Rationale: Exterior conditions require durable thin-set mortar that
withstands temperature changes and moisture.
11. Which tool is essential for leveling tiles during installation?
A. Rubber mallet
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a backer board in tile installation?
A. To act as the finished surface
B. To provide a waterproof layer
C. To provide a stable, flat surface for tile adhesion
D. To reduce sound transmission
Rationale: Backer boards provide a firm, stable substrate that helps
prevent cracking of tiles over time.
2. What is the standard thickness for most cement backer boards used in
residential tile installations?
A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 3/4 inch
,Rationale: 1/2 inch is the most common thickness for cement backer
boards in floor and wall applications.
3. Which trowel notch size is generally recommended for 12x12 inch
ceramic floor tile?
A. 1/4 inch square notch
B. 3/8 inch square notch
C. 1/2 inch square notch
D. 5/8 inch square notch
Rationale: Larger tiles require more adhesive coverage; 1/2 inch square
notch trowels provide adequate coverage for 12x12 tiles.
4. What is the main function of grout in tile installation?
A. To support the tile
B. To fill gaps between tiles and provide a finished look
C. To waterproof the floor
D. To act as a backer board
Rationale: Grout fills joints between tiles, preventing debris accumulation
and providing structural stability.
5. Which type of tile is most appropriate for high-moisture areas like
showers?
A. Vinyl
B. Porcelain or ceramic
, C. Laminate
D. Hardwood
Rationale: Porcelain and ceramic tiles are water-resistant and durable,
making them ideal for wet areas.
6. What is the recommended spacing for standard 12x12 inch floor tiles?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
D. 1/2 inch
Rationale: A 1/4 inch joint allows for proper grout placement and
accommodates minor expansion.
7. What is the best method for cutting large-format porcelain tiles?
A. Hand tile cutter
B. Wet saw
C. Utility knife
D. Scoring tool
Rationale: Wet saws provide clean, precise cuts for dense porcelain tiles.
8. Which is a characteristic of natural stone tiles compared to ceramic
tiles?
A. Less porous
B. More porous and requires sealing
, C. Cannot be polished
D. Always uniform in size
Rationale: Natural stone is generally porous and often requires sealing to
prevent staining.
9. When installing tile on a floor over a wood subfloor, which method is
preferred?
A. Directly on plywood with mastic
B. Using cement backer board over the wood subfloor
C. Floating floor method
D. Gluing tile to wood without preparation
Rationale: Cement backer board over wood prevents movement and
cracking of tiles.
10. Which adhesive is commonly recommended for exterior tile
installations?
A. Mastic
B. Thin-set mortar rated for exterior use
C. Epoxy glue
D. Construction adhesive
Rationale: Exterior conditions require durable thin-set mortar that
withstands temperature changes and moisture.
11. Which tool is essential for leveling tiles during installation?
A. Rubber mallet
