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Granite Tiles: Sizes, textures, and prices

You can buy slate in rectangular and square sizes that range from machine-finished pieces about 1/4 inch thick, which are best for counters and walls, to hand-split ones about 1/2 to 1 inch thick, which are most suitable for floors and terraces. Slate is either gauged or ungauged. Gauged slate has gone through a grinding machine, usually to smooth out one side, leaving the other (cleft) side alone. The machine finish guarantees a uniform thickness for ease in setting. Ungauged tiles are uneven on both sides, vary in thickness, and are best used as patio paving.

Price varies with type and source, but you can figure on $4 to $7.50 per square foot (some slates are more rare than others)--much less than marble, granite, or limestone. You can often find a limited range of 12-inch tiles for about $2 apiece in the tile section at home improvement centers. Slate is also available in slabs (the price range per square foot is comparable to that for marble and granite slab) for kitchen counters or tabletops, as tiles for roofing, and in random shapes that are suitable for patios. Some manufacturers are beginning to offer tumbled slate in small pieces and etched slate, which can be used to create ornamental details.

The most popular texture for slate is the roughened surface that results from the cleaving (splitting) process. It's wonderful for floors and patios, as it reduces the likelihood of slipping. The color and irregular pattern of the natural cleft gives each tile a singularity that, when grouped with others in a broad surface, achieves a one-of-a-kind appearance. You may have to purchase more than you need for covering to get consistent color. Slate is commonly sold at home centers, tile shops, and stone yards.

Wine-colored slate forms an elegant accent wall in this contemporary kitchen. Under-the-cabinet lighting adds to the warm glow. By Brukoff Design Associates

The sand-hued slate tiles covering this tub platform complement the natural wood trim of the windows and help set a tranquil mood. DESIGN: SkB Architects, Seattle (206/903-0575)