Tile & Stone Installation Flashcards

Which type of mortar is specifically designed for use with glass tile installations?

Answer: White non-sanded polymer-modified mortar

White non-sanded polymer-modified mortar prevents color show-through and provides the flexibility needed for glass tiles.

What should an installer do when encountering a crack in a concrete substrate before installing tile?

Answer: Apply a crack isolation membrane over the crack

A crack isolation membrane prevents existing cracks from reflecting through the tile assembly.

When setting a 12-inch tile, what size V-notch trowel is typically specified to achieve proper mortar ridge collapse and coverage?

Answer: 1/4" x 3/8" x 1/4"

A 1/4" x 3/8" x 1/4" V-notch trowel provides sufficient mortar volume for 12-inch tiles to achieve full contact when collapsed.

What is the correct sequence of steps when installing a mortar bed (mud bed) for tile?

Answer: Apply cleavage membrane, pack mortar, screed to grade, allow to cure, then tile

The proper sequence is membrane, pack, screed, then allow the bed to cure before tiling to prevent settlement.

When installing natural stone tile on a floor, why is a penetrating sealer applied before grouting?

Answer: To prevent grout from staining the stone surface

Penetrating sealers protect porous stone from grout staining during the grouting process.

What type of grout is most appropriate for joints less than 1/8 inch wide?

Answer: Unsanded (non-sanded) grout

Unsanded grout is formulated for narrow joints under 1/8 inch; sand particles in sanded grout are too large for these joints.

On a wood-framed floor, what is the recommended total thickness for a mortar bed installation to provide adequate stiffness for tile?

Answer: 1-1/4 inches minimum

TCNA guidelines recommend a minimum 1-1/4 inch mortar bed thickness over wood framing to reduce deflection risk.