Introduction

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Formed millions of years ago, granite is one of the hardest substances on earth, rating 7 on Mohs hardness scale.

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Joints

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Granite joints are finished with a small ariss to the top edge. Two part epoxy resin compound mix is applied to prevent water ingression.

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Tolerance

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Tolerance in granite is ±2mm

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Thermal expansion

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Due to thermal expansion granite can expand up to 1mm per metre. A gap of at least 3mm should be left at each end of the worktop when fitted and filled with decorators caulk. When granite is joined to other materials (such as glass, steel or wood) an elastic type of adhesive, for example polyurethane, is required for expansion.

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Overhangs and supports

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Any overhang extending more than 300mm must be supported.

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Hob and Sink cutouts

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Granite sink / hob cut outs are barred front & back (fitting of steel support bars to give additional support to cutouts), Without steel supports bars, the length of a cut out is reduced considerably. Large cut outs need to be scored and cored on occasions. This leaves the corners of the cutout in place, ready for removal on-site by the installer. Granite is susceptible to ‘blowing out’.

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This occurs when contact is made with the material whilst cutting or grinding. This is very common in large particled granite. ie. you would fill and seal the affected areas with epoxy resin (colour may vary) to ensure the material is not left with any sharp edges or ‘chips’.

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• A minimum of 120mm is required between two hob cutout.

• A minimum of 100mm is required between hob and sink cutouts.

• A minimum of 70mm is required between two sink cutouts.

• Sink cutouts are placed 50mm from the worktop front edge.

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Granite Upstands

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Upstands should ideally be 100mm high, as material less than this height is extremely fragile. Upstands are not normally cut from the same slab as the worktops, therefore an exact colour match is not possible. Granite upstands are straight and rigid, gaps will be visible where there are variations in the wall profile. Plastering or tiling should ideally be completed after the worktop installation.

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Scratching

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Granite is highly scratch resistant but not scratch proof. Small scratches of less than 25mm in length are considered ‘within tolerance’ and are considered acceptable throughout the industry, always check this with your supplier.

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Staining

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Although Granite is one of the least absorbent stone’s, it can still be stained by grease, wine, coffee, nicotine, fruit juices and other strongly coloured substances. Granite worktops are usually sealed upon installation and must be resealed every 6 months. Any spillages must be removed immediately as delay could result in permanent damage.

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Pitting and Veining

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As Granite is a natural stone, pitting and veining will occur in random distribution of swirls. Subtle variations in shade or areas of contrast will also appear within the body of the worktop.

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Fissures, Blemishes and Natural Flaws

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Some level of what could be referred to as spots or blotches are inherent in the material. Small fissures are a common feature in any Granite and these natural flaws were present at the rock formation.

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If you require any further information or help regarding Granite Worktops, feel free to contact one of our experts and we will be more than happy to help.

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*All the above information is for your guidance only, always check with your retailer/supplier for their terms and conditions of sale as these will vary from company to company. Kitchen Worktops UK cannot be held liable for any advice/help given to you from our advisors.

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