CTI CTI Grout & Mortar Systems 2

Question 1

Which setting mortar has a peanut-butter consistency and is applied with a notched trowel to create bonding ridges?

Accepted Answer

Thinset mortar

Answer

Thinset mortar has a wet, spreadable consistency applied with a notched trowel; the ridges collapse when tile is pressed in, maximizing contact.

Question 2

ANSI A118.4 specifies performance requirements for which type of tile setting mortar?

Accepted Answer

Latex-Portland cement (polymer-modified) mortar

Answer

ANSI A118.4 specifies requirements for latex-Portland cement (polymer-modified) mortar, offering improved bond strength and flexibility over standard thinset.

Question 3

When inspecting large-format tile (24"×24" or larger) installations, what technique should a CTI inspector verify was used to achieve proper coverage?

Accepted Answer

Large-format mortar with back-buttering of tile back

Answer

Large-format tiles require medium-bed mortar and back-buttering to achieve the minimum 95% mortar contact coverage required by TCNA.

Question 4

What minimum mortar contact coverage does TCNA require for tile installations in wet areas such as showers?

Accepted Answer

95%

Answer

TCNA requires 95% mortar contact coverage in wet areas and exterior installations to prevent water infiltration and ensure structural integrity.

Question 5

What product is the standard recommendation for removing dried cement grout haze from tile surfaces?

Accepted Answer

Sulfamic acid-based cleaner

Answer

Sulfamic acid cleaners dissolve dried cement grout haze without the aggressive strength of muriatic acid, making them safe for most tile surfaces.

CTI - Certified Tile Inspector Practice Test

CTI - Certified Tile Inspector Practice Test

CTI CTI Grout & Mortar Systems 2