CTI CTI Tools & Equipment 2

Question 1

Which tool is used to accurately transfer an irregular wall profile onto a tile for a precise fit?

Accepted Answer

Contour gauge (profile gauge)

Answer

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?

Accepted Answer

1/4" × 1/4" square notch

Answer

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?

Accepted Answer

It improves adhesion and helps achieve full mortar coverage on the tile back

Answer

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?

Accepted Answer

Foam grout float

Answer

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?

Accepted Answer

Removing small irregular pieces of tile for fitting around obstacles

Answer

A tile nibbler uses a punching action to break away small bits of tile, allowing you to fit around pipes, outlets, or curved edges.

(CTI) Certified Tile Installer Practice Test