As you shop for natural stone tiles, these are a number of general factors that you should consider.
Absorption Rating
The absorption rating refers to how porous a given material is. The more absorbent it is, the more susceptible the stone will be to stain. Absorbent stone can also be prone to cracking damage if it is subjected to freezing conditions. Natural stones vary greatly in their absorption rates, with sandstone being the most porous and granite the most impervious to water absorption. Absorption rates are classified according to the following terms:
Non-vitreous: This is the highest absorption level. In most cases, non-vitreous tiles should not be used in any damp environment.
Semi-vitreous: While these tiles are less absorbent, the more liquid they are exposed to, the more maintenance they will require.
Vitreous: This is the standard absorption level for flooring tiles and these materials are generally considered appropriate for most low- to mid-traffic indoor and outdoor applications.
Impervious: These materials are resistant to the absorption of liquids and thus will be easier to maintain. They are often used in high-traffic commercial applications.
In general, sandstone is the most porous natural stone material. Travertine, limestone, and slate have medium absorbency, while granite is relatively waterproof. Polished materials also absorb less water than honed or cleft surfaces.
Grade
Some retailers use a grading system to rate the quality of materials. This can refer to the size, shape, and thickness of the tile, as well as the condition of its surface. Most grading systems have three levels of quality:
Grade 1 refers to high-quality, uniform materials.
Grade 2 consists of materials with minor defects, such as chips, scratches, or irregular surfaces.
Grade 3 materials have major flaws in size, shape, surface, or chipping, making them appropriate only as accent pieces, or in certain rustic decorative applications.
Coefficient of Friction
This measures how slippery various materials are. The higher the coefficient, the more traction a tile will have. This number is especially important in moist environments such as bathrooms and kitchens, as well as high-traffic commercial areas. The Americans with Disabilities Act requires that flooring material has a minimum of a .6 dryness coefficient.
Indoor vs. Outdoor Rating
Some natural stone flooring materials are more suited to outdoor applications than others. Many of the factors above will determine whether a material should be used in an open-air environment.
Warning
Non-vitreous materials will be subject to staining through dirt and acid rain, as well as cracking when absorbed materials freeze and expand. Stones that have a low coefficient of friction will also pose a slipping hazard during rain and snowstorms.
Oxidation
Natural stone materials are formed beneath the earth over millions of years, and often contain a variety of disparate elements. Sometimes iron is present in these materials, which can manifest as bright red and amber hues in the surface of the stone. The problem in an outdoor environment is that those traces of iron can oxidize, a process more commonly known as rusting. This can cause the entire tile to degenerate over time.
Benefits of Using Natural Stone Flooring
There are many aesthetic and practical reasons why natural stone flooring can be a good choice:
Each piece of stone is a unique creation of the earth, making every flooring application one of a kind. Every floor is entirely unique.
The mountain-born qualities of the stone can help to give living spaces a direct and eternal connection to the natural world, unlike any other building material.
Stone tiles are natural, nonpolluting, eco-friendly pieces. Purchasing stones which were acquired locally can cut down on the environmental impact of transport
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