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BDU Stone Tile Flooring and Countertop College™


Slate: No Slip-Ups


What you will learn: The origins of slate; applications of slate as flooring; practical advantages of slate; how slate is cut and varieties available; definitions of "gauge" and "calibration" in reference to slate; about color variations in slate.


Slate’s naturally slip-resistant surface is very hard and durable, with varied colors and features that have served builders and architects for centuries. Suitable for indoor as well as outdoor applications, slate satisfies several natural stone flooring needs....


Slate has been a popular choice through centuries and across continents for both practical and decorative uses. Slate is formed by means of tremendous pressure and heat from deep in the earth, and found most commonly along continental coasts all over the world. The harsh beginnings which formed the slate give way to a rock that stands up to wear as well as one that reveals a singular beauty. Slate flooring is typified by earthy color variations that make each tile unique.

Slate is often installed as flooring for use in foyers, hallways and bathrooms as well as for poolside surfaces, due in large part to its characteristic slip-resistance, a common consideration in these areas. One of the most popular textures available in slate is that of the "split face" variety, which is particularly effective when looking for this slip-resistant feature. With a range of colors that vary from orange, to beige, to greens and purples, slate offers a distinct aesthetic dimension as well, adding to its value as a decorative natural stone tile as well as a practical one.


Cutting Slate: Gauge


At the production stage, slate tile processing proceeds with the idea that an installation should be as easy as possible. The first principle in working with any kind of interlocking building material, such as slate, is the dimensional uniformity of the material. The term "gauge" refers to the process of making sure that the slate tiles have been cut square, allowing them to be as uniform as possible when it comes time to install them. Working with slate that is square will allow for a more straight-forward installation, saving time and money for everyone concerned.


Cutting Slate: Calibration


Another term you will commonly hear when looking for slate, or any natural stone for that matter, is "calibration." This refers to the surface of the stone and the process whereby each tile is cut to a specified thickness in relation to other tiles of its variety. Once again, this process is done with simplicity of installation in mind. The slate is machine honed on the back to either a flat or combed finish, and in both cases is made even to achieve uniformity. One of the most vital elements in laying any flooring is to ensure that the resulting flooring is absolutely level, and the process of calibration at this stage of production addresses this requirement. Along with gauge, this mechanical processes of calibration helps to make sure that the slate is cut in such a way as to be practical as well as aesthetically pleasing.


Color variation in slate


Because slate is made from a natural stone, you can expect a certain level of color variation from tile to tile. This is because of the fluctuation of the amounts of minerals and other compounds unique to each individual tile. Although this can be seen as a disadvantage if you’re looking for a monochromatic effect, it can really work in your favor when laying your slate with a more diverse design approach in mind. These natural color variations allow you to be creative when it comes time to laying out each tile, making a unique statement with the individual slate tiles you have at your disposal; let your imagination run wild! No other slate floor will look exactly like yours! For this, a good idea is to open all of the boxes of slate you’ve purchased to see the full spectrum of the natural stone in unique to your batch. This will allow you to plan out how you wish to design your floor in a dry run, much like you would do with ceramic tile or granite tile.

Slate is a popular, practical, and decorative natural stone tile solution for flooring. The slate option is a great choice when you’re looking for a surface that is slip resistant, and one that is specifically designed to be uniform for the most level and even surface possible. With the natural color variations, you have the option of getting creative when it comes time to install your slate, and you can really make a unique statement that will make your floor truly distinctive


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Sealants for Slate

Like most natural stone, slate requires a sealant to allow it to be more resistant to staining. For this, there are several options in terms of the overall visual effect. When applying a sealant, it is always best to test a small area of your slate to make sure that the effect is really what you’re after. There are a variety of sealants which will offer these various looks:

  • high-gloss - lends your slate floor a lustrous "wet" look
  • low sheen - slightly reflective, but without the luster of high-gloss

  • no sheen or natural finish - a sealant which is designed to dry "invisibly" as a means to retain the natural feel of the slate

Consult your local Do-It-Yourself retailer to get ideas about which brands or varieties of sealants would best suit your particular slate project and always follow the manufacturer’s instructions on the products you use. Remember to ask about your choice of sealer, to make sure that it is appropriate for slate – some sealants and waxes reduce the natural slip resistant nature of slate, which can really detract from its intended use if the installation is to be in an area where a slip resistant surface is paramount. Be advised that all stone floors can become slippery when they are wet!