CTI CTI Tools & Equipment 2 — Questions and Answers
Question 1: Which tool is used to accurately transfer an irregular wall profile onto a tile for a precise fit?
- T-square
- Contour gauge (profile gauge) (Correct answer)
- Chalk line
- Level
Correct answer: Contour gauge (profile gauge)
A contour gauge has sliding pins that conform to any irregular profile, which can then be traced onto the tile.
Question 2: What is the recommended notch trowel size for 4×4 inch ceramic wall tiles?
- 1/4" × 1/4" square notch (Correct answer)
- 1/2" × 1/2" square notch
- 3/4" × 3/4" square notch
- 1/8" × 1/8" V-notch
Correct answer: 1/4" × 1/4" square notch
The TCNA handbook recommends a 1/4" × 1/4" square-notch trowel for small ceramic wall tiles to avoid excessive mortar squeeze-out.
Question 3: Why is it important to back-butter a tile in addition to troweling the substrate?
- It speeds up curing time
- It improves adhesion and helps achieve full mortar coverage on the tile back (Correct answer)
- It prevents efflorescence
- It reduces lippage
Correct answer: It improves adhesion and helps achieve full mortar coverage on the tile back
Back-buttering ensures mortar bonds to the tile back directly, achieving the minimum 95% coverage required for wet areas.
Question 4: Which type of grout float is designed to minimize scratching on polished tile surfaces?
- Metal grout float
- Hard rubber grout float
- Foam grout float (Correct answer)
- Steel trowel
Correct answer: Foam grout float
A foam grout float has a softer surface than rubber and reduces the risk of scratching highly polished or honed tile finishes.
Question 5: What is the function of a tile nibbler tool?
- Smoothing grout joints
- Removing small irregular pieces of tile for fitting around obstacles (Correct answer)
- Mixing thin-set
- Spreading sealant
Correct answer: Removing small irregular pieces of tile for fitting around obstacles
A tile nibbler uses a punching action to break away small bits of tile, allowing you to fit around pipes, outlets, or curved edges.
Question 6: When using a laser level during tile installation, what is its primary benefit?
- It measures mortar thickness
- It projects reference lines that ensure tiles remain straight and level across large areas (Correct answer)
- It dries mortar faster
- It detects hollow spots
Correct answer: It projects reference lines that ensure tiles remain straight and level across large areas
A laser level projects perfectly straight horizontal and vertical lines across an entire room, serving as a continuous alignment guide.
CTI CTI Tools & Equipment 2
Which tool is used to accurately transfer an irregular wall profile onto a tile for a precise fit?