Gray Vs. White Thin Set Mortar

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White thinset is recommended for clear or opaque mosaic tile installation.

Required for the installation of tile ranging from tiny mosaics to large limestone tile, thinset comes in two colors: white or gray. The color of thinset is determined by the type of cement used during the manufacturing process; white cement is used in white thinset; gray cement in gray; both colors perform identically. In many cases, the color of thinset does not matter. Nevertheless, in some instances the do-it-yourselfer's choice of material determines the color of thinset required for the job.

Glass Mosaic Tile

Due to their translucent or completely transparent properties, mosaic tiles require installation with white thinset. If installed with gray thinset, the coloring of mosaics will change drastically. On the other hand, white thinset does not alter the look and color range of glass mosaic tile.

Travertine and Porous Natural Stone

Limestone such as travertine is very porous and stains easily. For this reason, experts recommend the use of white thinset in installing porous stone. Take note that white thinset can still stain the most porous varieties of limestone.

Slate Tile

Slate tile is typically less porous than travertine and has a dark-colored body. For this reason, gray thinset is recommended. White thinset may prove to be difficult to clean off the surface and small cracks on the finished surface area of slate; gray thinset eliminates this risk.

Granite Tile

Granite tile is extremely dense and impervious to staining during installation, therefore either gray or white thinset are appropriate, although the do-it-yourselfer may want to choose the thinset color that is the closest in color range to his selected grout color.

Ceramic and Porcelain Tile

Ceramic and porcelain tile share a common characteristic: it does not matter whether you install them with either gray or white thinset. Often the choice of thinset color simply comes down to the grout color selection. For instance, if you are installing granite tiles and have selected a gray-toned grout color, gray thinset is a good choice for installation. If the thinset shows through the grout, it will be less noticeable.

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Tim Daniel

Residing in San Diego, Calif., Tim Daniel is a professional writer specializing in politics. His work has appeared at both the Daily Caller and Pajamas Media. With more than 20 years of experience in the field of construction, Daniel also specializes in writing about tile, stone and construction management. He is pursuing a bachelor's degree in communications.