Tile & Stone Installation Flashcards

What is the minimum recommended grout joint width for rectified porcelain tiles?

Answer: 1/16 inch

Rectified tiles have precise, uniform edges allowing grout joints as narrow as 1/16 inch.

When installing large-format tiles (24"x24" or larger), which trowel method is recommended to ensure full mortar coverage?

Answer: Back-buttering combined with substrate troweling

Large-format tiles require both back-buttering and substrate troweling to achieve the required 95% mortar contact.

What does ANSI A108.02 specify as the minimum bond coat coverage for tile installed in wet areas?

Answer: 95%

ANSI A108.02 requires 95% mortar coverage for tiles in wet areas, exterior applications, and for large-format tiles.

Which type of membrane is most appropriate for waterproofing a shower floor prior to tile installation?

Answer: Fabric-reinforced liquid-applied waterproof membrane

Fabric-reinforced liquid-applied membranes create a continuous waterproof barrier that fully bonds to the substrate.

What is the purpose of a cleavage membrane (like 15-lb felt) installed beneath a mortar bed?

Answer: To allow the mortar bed to float independently of the substrate

A cleavage membrane allows the mortar bed to move independently, preventing cracks in the substrate from telegraphing through.

When using epoxy grout, what is the most critical installation condition to monitor?

Answer: Ambient temperature and humidity

Epoxy grout has a limited working time that shortens significantly in high heat, making temperature and humidity control critical.

What is the industry-standard maximum lippage allowed between adjacent tiles in a standard residential floor installation?

Answer: 1/16 inch

ANSI A108.02 specifies a maximum lippage of 1/16 inch plus the allowable variation in the tile itself for floor installations.