Design Details

Granite Worktops Fabrication Process

Granite is one of the hardest natural rocks on earth, rating 7 on Mohs hardness scale, but with the proper care, can be turned into one of the most beautiful surfaces. Bluestone uses state-of-the art technology to lovingly cut and polish natural slabs to create a magnificent and timeless worktop that is truly unique, in that no two pieces of granite look exactly the same.

Here are some of the most popular design choices…

Edge Details

Return Ends

Cutouts & Drainer Grooves

Technical Info

Worktop Finishes
Bluestone offer a selection of finishes including polished (standard),honed, leather, flamed and brushed finishes.
Polished Finish – Gloss and flat to the touch
Honed Finish – Matt and flat to the touch
Leather Finish – Satin and soft to the touch
Flamed – Heat treated, to produce a textured undulating to the touch

Worktop Finishes, Sizes & Tolerance
Pitting and Veining is a natural and is expected in stone worktops
With stone worktops small fissures are common; blemishes and flaws are formed in the stone when cooling in the earth’s surface
Slate, marble and limestone have various different veins, markings and patterns and every piece is unique

The size of the ‘scant’ or ‘slab’ from which we fabricate the worktops, is a major factor in selecting the maximum usable length of a work surface. We are able to fabricate solid granite worktops up to 2.8m x 1.3m due to the weight and composition of granite. This may have to be reduced if you require a cutout, especially in granite with larger crystals.

Tolerance in granite is ±2mm

Joints
All joints are finished with a small ariss to the top edge and are carefully sealed with silicone to allow for expansion and to prevent water seeping through or bacteria growing in cavities.

Thermal Expansion
Granite can expand up to 1mm per metre and therefore a gap of at least 3mm should be left between the worktop and any walls. These gaps are filled with decorators caulk for a neat finish.

When granite worktops are joined to other materials (such as glass, steel or wood) an elastic type of adhesive, for example polyurethane, is required for expansion.

Overhangs and Supports
Any overhang extending more than 300mm should be supported.

Due to the weight of granite, it is essential that your units are level and securely fixed.

Cutouts for Hobs, Sinks, etc
Large cutouts need to be scored and cored on occasions to leave the corners of the cutout in place if they need to be removed on-site by the installer.

During cutting or grinding on-site, granite is vulnerable to chips and is almost inevitable. Any affected areas are filled and sealed with epoxy resin (colour may vary slightly) to ensure the worktop is not left with any sharp edges or ‘chips.’

If the worktops are too long, or the type and size of cutouts require additional support, “slips” (in kit form) are fitted around sink and hob cutouts.

  • Sink cutouts are placed a minimum 50mm from the worktop front edge.
  • A minimum of 120mm is required between two hob cutouts.
  • A minimum of 100mm is required between hob and sink cutouts.
  • A minimum of 70mm is required between two sink cutouts.

Stainless Steel Sinks
Carefully select your preferred method of undermounting stainless steel sinks to ensure sufficient support.

If a waste disposal unit is fitted to an undermounted sink after installation, additional support will be required, otherwise your warranty may be invalidated.

When the plumbing is done to the sink, it is important that the plumber reseals it with silicone, otherwise the granite is left vulnerable and your warranty may be invalidated.

Upstands
Upstands less than 100mm high are extremely fragile and are not recommended, the very minimum allowed is 60mm

Upstands are not normally cut from the same slab as the worksurfaces and therefore an exact colour match is not possible.

Because granite upstands are straight and rigid, gaps will be visible if there are any imperfections or variations on the wall profile. To cover these gaps between the wall and the upstands, it is recommended that plastering or tiling be completed after the worktop installation.

Care and Maintenance
Bluestone offer a Care and Maintenance Kit which has been developed to offer the customer everything they need to keep their worktops looking good for years to come

Scratches
Granite is highly scratch resistant but not scratch proof. Slate, marble and limestone are much softer than granite and greater care must be taken to avoid scratches to the surfaces

Staining
The stone will be sealed in the factory but it is possible to stain it with such things as wine or grease. It is recommended that the worktop must be re-sealed every 6 months to help reduce the risk of any damage to your worktops. Bluestone sell care & maintenance kits which clean, seal, and maintain your granite worktops to the very highest standard.

Handling
For installation of worktops weighing above 120kg, you will need to supply additional labour at no cost to Bluestone. Every additional 75kg requires an extra person to assist with lifting.

 

Return to Stone Worktops

 

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