Grouting
What kind of Grout?
  • Grout comes in 4 basic forms:  Sanded,  Unsanded,  Premixed and Epoxy Based.
  • Sanded Grout is the best choice for most projects.  Sand adds to the strength and helps to prevent shrinkage.  Sanded grout is intended for joints up to 1/2".  Look for polymer fortified versions.  I use sanded grout almost exclusively.  Note:  The sand particles can scratch the surface if delicate glazes and mirrored glass.  This can be prevented by careful cleaning with a light hand.  You may also tape off these surfaces to protect until you are finished grouting.  Most sanded grouts can be used indoors and out and in moisture rich conditions.  Check the back of the box for manufacturers recommendations.
  • Unsanded grout can ONLY be used for grout joints that are 1/8" or smaller.   If the joint is any larger the grout will crack, it may sink, and it is also very difficult to smooth out.  Note: if your joints are 1/8" or less you can still use sanded grout.
  • Premixed comes with wet with the liquids added and can be used directly from the container.  I know you are thinking  "ahhh! This sounds great!".  Remember easier is not always better.   Most premixed grout is unsanded and subject to the same problems.  I find it difficult to work with and personally believe it is never a good choice.
  • Epoxy grouts can be used where high levels of moisture are present.  Most epoxy grouts are water proof and will withstand the worst conditions.  Epoxy based grouts will come in multi part containers that need to be mixed in specific proportions.  A hardener, a resin and sometimes a separate aggregate.  Epoxy based grouts are more difficult to work with, to clean up and I suggest before tackling a prized piece you practice using it.
  • Polymer Fortified Sanded grout in pre-mixed colors can be purchased on this site on the Grout and Adhesives page.