Grouting & Finishing Techniques Flashcards

When grouting a floor with large-format tiles (24"x24" or larger), which grout joint width is typically the minimum recommended to allow for lippage tolerance?

Answer: 1/8 inch

Large-format tiles generally require a minimum 1/8-inch grout joint to accommodate slight warpage and lippage inherent in manufacturing.

What is the primary purpose of back-buttering tile edges before grouting a stone installation?

Answer: To fill voids left by the notched trowel

Back-buttering tile edges before grouting fills voids beneath tile edges that notched trowel ridges may not have fully covered.

Efflorescence appearing on a grouted tile surface is caused by:

Answer: Soluble salts carried to the surface by water migration

Efflorescence is a white crystalline deposit formed when water carries soluble salts through the grout and they crystallize on the surface as water evaporates.

Which tool is best suited for packing grout into joints on a mosaic tile installation with small joints?

Answer: A hard rubber float

A hard rubber float provides the firmness needed to force grout deeply into the small joints of mosaic installations without tearing the mesh backing.

After grouting, you notice grout haze has dried on a polished marble surface. What should you use to remove it?

Answer: A manufacturer-approved grout haze remover safe for natural stone

Only a stone-safe, non-acidic grout haze remover should be used on polished marble, as acids and abrasive pads will permanently damage the finish.

What does the ANSI A108.10 standard specifically address regarding grout?

Answer: Installation of grout in tile work

ANSI A108.10 covers installation of grout in tile work, providing the industry standard specifications for grouting procedures.

When installing glass tile, which grout characteristic is most critical to prevent telegraphing through the tile face?

Answer: White or matching color with no aggregate larger than joint width

Glass tile is translucent, so grout color must match or complement the tile and aggregate particle size must not exceed joint width to prevent visible texture behind the glass.