Slate is a metamorphic rock. It is valued for its ability to break into thin plates. Slate is derived from shale or mudstone that has experienced intense heat or pressure beneath the surface of the earth. It is made up of parallel foliated plates. This gives it the ability to break smoothly and evenly along its cleavage. Slate ranks at 5.5 on the Mohs scale. Slate comes in a wide range of colors that are determined by the minerals found within the stone.

Each slate is unique. Its texture tells us the story. Formed by all the natural forces and made up of many different minerals. No other artificial alternatives could compare with a product which has been molded by nature for over 500 million years. The cleavage surface of slate may have either a shiny or dull luster. Cross fractures are typically dull. Slate is an opaque material that does not transmit any light. Unlike the artificial products, the colour and the properties of slate stay, unalterable, through time with no need of maintenance.

Slate is a product with unmatchable technical properties that adapts to any project, always providing considerable added value. Using slate in architecture has endless design possibilities. It is very versatile and can be used to cover any shape of roof or facade. This versatility allows builders to incorporate intricacies in their design that would be impossible to achieve in other materials. Natural slate, the best material for roofs and facades known to man. With a durability of over 100 years, natural slate is the most resistant material used for roofing.

Slate is capable of enduring extreme temperatures, difficult snow formation, fire-resistance as well as being fully waterproof. Only natural slate guarantees a perfect performance in any weather condition. Slate has endured the test of time. Its unparalleled character and durability makes this material ideal to preserve the aesthetics appearance and personality of any architectural project.

WHY SHOULD YOU CHOOSE NATURAL STONE?

Natural stone is held in high regard as a premier building material because it reflects unique character, stability, and grandeur. Variations in natural stone’s broad range of color, pattern, and texture are visually interesting and impossible to replicate. And, because it comes from the earth, from eco-friendly compositions, it is a natural choice.

Variety: The diversity of natural stone products encourages limitless design potential. Aesthetically, what you do with stone is as varied as your imagination. Its many factors in the way stone formed within the Earth contribute to its varieties and enhance the innovation it provides, something that cannot be duplicated in a laboratory or come from a mould.

Durability: Natural stone exhibits a durability not found in other building materials. There is an emotional connection to buildings and monuments built in stone that carries a great deal of meaning due to enduring history and a legacy of mankind through the ages.

Green Attributes: Natural stone products like those formed in granite, marble, travertine, onyx, tra-onyx, quartzite, limestone, sandstone, slatestone and others, differently from artifical materials, innate characteristics that contribute toward LEED (Leadership in Energy and Environmental Design) or LEED intended construction. Consider stone’s low embodied energy, ready availability as a naturally occurring material, no off-gases to impair indoor air quality, high thermal capacitance, and exceptional durability for low maintenance and structural permanence. Using natural stone for your projects shows that you care about the environment and consciously strive to preserve it.

Unique: Design projects should stand out and reflect the passion, taste, and personality of the designer. Natural stone is a one-of-a-kind building material that sets you apart from others because it can’t be mimicked, manufactured, or faked.

Value: The value in natural stone is more than a monetary measure. It involves longevity, ease of maintenance, permanence and stability that far exceed initial investment. Utilizing natural stone is now more affordable than ever due to advancing stone quarrying and processing technology that has improved efficiency over the years. New automated machinery allows fabricators to cut natural stone thinner, faster, more consistently and at less cost than in times past. Development of anchoring technologies and systems make installation easier, quicker, and more secure. In addition, natural stone is simple to care for, has an appearance that literally improves with age and can last a lifetime.

NATURAL STONE INSTALLATION INSTRUCTIONS

The proper choice of tools and implements is very important; angle grinder machine or water jet cutting table with diamond blades, notched trowel, spirit level, white rubber mallet, rubber trowel for grouting, cross-spacers for joints and mixing vessels for adhesive preparation etc.

The flatness of the substrate should not be over 5 mm span, therefore must be checked with a 2 meter rule. In case of any flatness defect, the substrate must be re-leveled in order to fix the difference. The substrate must be resistant, stable and totally dry, in order to obtain a correct adherence.

In order to avoid bonding problems, the substrate must be totally clean, free of dust, grease, mortar residues, etc. It is advisable to clean the surface before laying the tiles.

The adhesive type must be chosen in relation to the material absorption and the substrate properties. In any situation, as a precautionary measure, we do not recommend sand mortars use, since sand contains different salts, and when mixed with the cement and water, could be absorbed by the material porosity and may produce pathologies called efflorescence.

For high-absorption materials, like sandstone and limestone, we recommend C1 adhesive for indoor use, and C2 for outdoors. In case of marbles and granites, C2 adhesives can be used in both indoors and outdoors, since the main property of this product is the great adherence and elasticity. In case of natural stone materials with fiberglass or mesh backing, we recommend the use of Type R reactive resin adhesives.

Use a notched trowel to spread the product on the substrate, in order to control the thickness and assure the adhesive distribution all over the surface. For 30x30 cm or larger pieces, it is recommended to use the buttering-floating technique, which consists of applying the adhesive on both the substrate and the back of the tile, in order to ensure a 100% contact with the bonding material.

In order to ensure a total flattening of the grooves left by the notched trowel on the bonding material, lay the pieces and tap them with a rubber mallet. We recommend leaving at least a 1.5 mm. joint between interior pieces and 3 mm for exterior pieces. This is to compensate possible material expansion/contraction caused by temperature variations, of course considering perimeter and structural joints.

The grouting process consists of filling the space between pieces, better known as joints. The installation joints must be clean and free of bonding materials, traces of dirt and grime. This way, adherence of grout will be improved and more effective.

The grouting material should be applied 24-48 hours after the covering application, in order to help the evaporation of the water used to prepare the bonding mixture. This way is possible to avoid moisture stains that might end up causing efflorescence pathologies.

The grouting material should be applied with a rubber trowel and always in the joint gap. Never use the traditional grouting method, which consists of spreading the grouting material all over the coated surface, since the stone porosity can cause scale problems and interfere with the subsequent cleaning.

The removal of grouting material residues must be done not too long after the application. It is necessary to use a damped sponge to avoid leaving grouting material deposits.

In case of laying polished or honed floor coverings, it is advisable to protect the surface until the building work is over. This is mainly not to damage the material and make the cleaning easier.

To carry out cutting procedures in natural stone pieces, it is advisable to mark the pieces with a pencil. To carry out stone drilling, it is necessary to use carbide bits, always beginning with a small diameter until getting the expected result.

NATURAL STONE CARE AND MAINTENANCE

Natural Stone is considered a high quality covering, which fulfills all the physicochemical and building requirements to carry out a good project with demonstrable benefits. One of the main benefits is the low maintenance cost in comparison to other materials like stoneware and artificial stone. The hardness and lifespan of natural stone can be increased with a good election of the material finish, treatment and further maintenance.

Water is the best cleaning solution. However, when it comes to clean and disinfect, it is advisable to use pH balanced cleaners (7-10 pH). Never use aggressive detergents as bleach, ammonia, anti-scaling products, etc. Never use metal utensils that may scratch the surface. In case of stains, try to clean with soapy water first. If the stains persist, proceed with "deep clean" type cleaners available from good manufacturers.

Stain Type and Detergente:

Oils: Water diluted acid solution (vinegar)
Grease: Sodium bicarbonate and warm water
Wine: Water diluted alkaline cleaner
Coffee: Water diluted cleaner*
Blood: Water diluted cleaner*
Ink: Water diluted cleaner*
Paints: Paint remover and plenty of water
Polish: Acetone and plenty of water

* In case of using bleach as cleaning product, this must be water diluted.
* As a general rule, it is advisable to start with low concentrations or maximum dilution. Increase the amount little by little, depending on the results.
* It is important to know that hot water has a higher cleaning potential than cold water.
Remember: Despite the aging, natural stone can always be re-polished to recover its original finish.
Caution: Observe the detergent manufacturer’s precautions and recommended dilutions. Do not use products containing hydrofluoric acid or its derivatives.