CTI CTI Tools & Equipment 1 — Questions and Answers
Question 1: Which type of trowel is most commonly used to apply thin-set mortar for large-format tiles?
- V-notch trowel
- U-notch trowel
- Square-notch trowel (Correct answer)
- Margin trowel
Correct answer: Square-notch trowel
A square-notch trowel is recommended for large-format tiles because it provides maximum mortar coverage.
Question 2: What is the primary purpose of a rubber mallet in tile installation?
- Cutting tiles to size
- Embedding tiles firmly into mortar without cracking them (Correct answer)
- Mixing mortar
- Removing old grout
Correct answer: Embedding tiles firmly into mortar without cracking them
A rubber mallet gently seats tiles into the mortar bed without the impact force that would crack the tile.
Question 3: Which saw is best suited for cutting curves and irregular shapes in ceramic tile?
- Angle grinder
- Tile wet saw
- Rotary tool with diamond bit (Correct answer)
- Score-and-snap cutter
Correct answer: Rotary tool with diamond bit
A rotary tool fitted with a diamond bit allows freehand curved cuts that straight-blade saws cannot make.
Question 4: What does a tile lippage leveling system primarily help prevent?
- Grout cracking
- Uneven tile edges that create height differences between adjacent tiles (Correct answer)
- Tile discoloration
- Mortar shrinkage
Correct answer: Uneven tile edges that create height differences between adjacent tiles
Lippage systems use clips and wedges to hold adjacent tiles flush while the mortar cures, eliminating height differences.
Question 5: When should a diamond blade wet saw be used instead of a score-and-snap cutter?
- Only for wall tiles
- For porcelain or stone tiles that are too hard or thick to snap cleanly (Correct answer)
- Only for mosaic tiles
- When no water is available on site
Correct answer: For porcelain or stone tiles that are too hard or thick to snap cleanly
Dense porcelain and natural stone require a diamond wet saw because the score-and-snap method causes irregular breaks in hard materials.
Question 6: What is the correct way to check for hollow spots under an installed tile?
- Press firmly on each tile corner
- Tap the tile surface with a grout float
- Use a wooden or metal sounding tool and tap lightly across the surface (Correct answer)
- Pull the tile up and re-examine the mortar
Correct answer: Use a wooden or metal sounding tool and tap lightly across the surface
Sounding (tapping) with a mallet or special tool produces a hollow ring where mortar contact is insufficient.
CTI CTI Tools & Equipment 1
Which type of trowel is most commonly used to apply thin-set mortar for large-format tiles?