Common Mistakes

Common Mistakes

Common Mistakes in Fabrication,
Installation & Post-installation

We at Caesarstone believe that being a Master of Stone means participating in an ongoing journey of learning that requires all fabricators in the stone fabrication industry to be supremely professional, with extensive knowledge and diverse skills.

To support you on this journey, we have created a guide that summarizes common mistakes in fabrication, installation and post-installation. It includes information about the causes of these mistakes and proposed solutions to prevent them. Please see the Fabrication & Installation Guide for full details.

This guide will help you to work professionally and save valuable time and money.

Fabrication: Storage, Color Matching, Pattern Matching

FABRICATION

1. Storage

FALLING FROM OPEN END OF RACK OR A-FRAMES 

Cause

Slabs stored on open ends of rack or A-frames

Solution

• Do not store slabs on the open ends of racks or A-frames as there is a danger of the slabs falling if tilted too far.
• Slabs may be safely contained between the uprights of A-frames. This arrangement, although not ideal, is safer than open-ended A-frames. It should be used only as a temporary storage measure.

Full information on this topic can be found in the Fabrication & Installation Guide.

WARPING

Cause
Exposure to high temperatures

Solution
Store the slabs in a cool place. If this is not possible, provide additional support by building a third post on the stand, or placing a 30 mm thickness slab against the posts.

Full information on this topic can be found in the Fabrication & Installation Guide.

DISCOLORING

Cause
Exposure to UV light

Solution
Store under cover, out of direct sunlight.

Full information on this topic can be found in the Fabrication & Installation Guide.

SCRATCHES OR OTHER SURFACE DAMAGE

Cause
Polished surface exposed

Solution
Store the slabs face-to-face and back-to-back, with the backs of the outer slabs in each rack facing outwards so that the polished surface is not exposed.

Full information on this topic can be found in the Fabrication & Installation Guide.

CHIPPING

Cause
Slabs stored on metal base with no protective buffer

Solution
Place rubber buffers on the base of the stand to prevent the slabs chipping.

Full information on this topic can be found in the Fabrication & Installation Guide.

2. Color Matching

COLORS NOT MATCHING ON SEAMS OR CHANGES OF SLAB DIRECTION

Cause
Adjoining pieces are from different batches

Solution
Using slabs from the same batch for each job should ensure a color match. However, always perform a visual color match before cutting to confirm consistency in shading.

Each production cycle carries a different batch number. The batch number appears on the label affixed to all slabs and is also stamped on the back of the slab.

Full information on this topic can be found in the Fabrication & Installation Guide.

Fact: Caesarstone quartz and Caesarstone Mineral^TM surfaces are manufactured from natural materials. 
This may result in slight color and aggregate variations between slabs and production cycles.

COLORS NOT MATCHING ON SEAMS OR CHANGES OF SLAB DIRECTION

Cause
Adjoining pieces are from different slab cuts

Solution
When cutting slabs, try to keep ends cut from adjoining sections of the same slab butted up together. This will provide the best match for pattern arrangement and color consistency. This is particularly recommended for installations in areas with a high amount of reflected light.

Full information on this topic can be found in the Fabrication & Installation Guide.

Example of plan of slab pieces

3. Pattern Matching

PATTERNS AND VEINS NOT MATCHING ON SEAMS OR CHANGES OF SLAB DIRECTION

Cause

• Not planning cuts in advance for best match
• Not wanting wastage

Solution

• Plan pattern match with clients.
• Allow for more wastage for best pattern match.

Full information on this topic can be found in the Fabrication & Installation Guide.

Fact: New technology enables the manufacture of slabs with patterns and veins, which need to be correctly matched for best appearance.

Fabrication: Shipping on Edge Profiles, Cracks from Cutouts

FABRICATION

4. Chipping on Edge Profiles

CHIPPING ON EDGE PROFILES

Cause
Sharp edge profiles

Solution
Do not create sharp edge profiles as impact may cause chipping. Edge profiles should be rounded or beveled with a minimum edge profile of 3 mm (1/8"), but preferably 4-6 mm (3/16-1/4”).
The larger the surface area of the edge profile, the more resistant it is to chipping.

Full information on this topic can be found in the Fabrication & Installation Guide.

5. Crack From Cutouts

CRACKS EMANATING FROM SINK/COOKTOP CUTOUTS

Cause
Insufficient/incorrectly fabricated radius on cutouts

Solution

• Fabricate a minimum radius of 10 mm (⅜") with a core bit/cup drill for all seen and unseen corners in cutouts; see figure 1. The larger the radius, the stronger the corner.
• In the event that fabricating a 10 mm (⅜") cutout corner radius would prevent the proper installation of an item that requires a 90° angle corner, drill beyond the corner with a core bit/cup drill; see figure 3.
• Take care not to cut beyond the rounded edge in cutouts as in figures 2 and 4. Damage to the area may lead to the formation of hairline cracks.
• Do not cut square corners or cross cut corners as in figures 5 and 6.
• Do not cut a large radius in sections as in figure 7.

Full information on this topic can be found in the Fabrication & Installation Guide.

Installation: Seaming, Polishing Surface

INSTALLATION

6. Seaming

SEAMS OPENING • SEAM APPEARANCE • ADHESIVE STAINS AROUND SEAMS

Cause

• Not working with professional seaming clamp
• Cabinets not level
• Insufficient support for seams, particularly in areas of heat

Solution

• Preparation for seaming:
  • Ensure that the cabinets are level.
  • Attach wooden support strips to the cabinetry under seams. The center of the seam should rest on the support strip.
  • We suggest the use of a full subdeck for added support in areas of heat.
• Seaming process:
  • Part the fabricated pieces of surface slightly at the seam.
  • Place a layer of paper, plastic film or plastic tape on the cabinet underneath the seam in order to prevent the adhesive from sticking the surface to the cabinet.
  • Apply tape to the edges of the surface to be seamed in order to prevent staining by adhesives.

• Prepare a suitable color-matched resin adhesive. Take into account that the color may be slightly lighter after drying.
• Ensure that the seam is clean of debris and clean the inside seam edges with alcohol.
• Spread a generous amount of the adhesive on the inside of both sides of the seam.
• Close, secure and straighten the seam with clamps or a professional seaming clamp to create a smooth, flush surface.
• After the adhesive is completely dry, remove the clamps.
• Remove any excess adhesive with a scraper or razor blade held at an angle to avoid chipping the adhesive.
• Perform final cleaning with alcohol on a clean white cloth.

Do not polish seams on Caesarstone surfaces!

Full information on this topic can be found in the Fabrication & Installation Guide.

7.  Polishing Surface

FABRICATOR POLISHED SURFACE AND MADE IT INCONSISTENT WITH THE ORIGINAL FACTORY FINISH

Cause
Polishing the surface to try to remove scratches, imperfections or to level the surface.

Solution
Do not polish the surface or seams to remove scratches, imperfections or to level the surface as this will create a polishing level inconsistent with the original factory finish. Please speak with your Caesarstone technical consultant.

Full information on this topic can be found in the Fabrication & Installation Guide.

Installation: Cracks Post-installation

INSTALLATION

8. Cracks Post-installation

CRACKS APPEARING POST-INSTALLATION 

Cause
Uneven or unstable cabinets

Solution

• Before installing the surface, ensure that cabinets are complete, stable, level and suitable for bearing the weight of the surface.
• The cabinets must be fixed to each other and secured to the back wall.
• The front and back legs must be stable and in full contact with the floor.
• Place all the fabricated pieces of the surface in their final position on the cabinets without adhesive. Check with a spirit level and long ruler that the surface is straight and level.

Full information on this topic can be found in the Fabrication & Installation Guide.

CRACKS APPEARING POST-INSTALLATION 

Cause
Insufficient support, particularly on long seams or void areas

Solution

• Support Caesarstone surfaces on a subdeck or a strong perimeter frame with all necessary supports.
• For areas larger than 600 x 900 mm (24" X 36"):
  • for 13 mm and 20 mm surfaces, use a 15 mm (5/8") plywood subdeck
  • for 30 mm surfaces use a 50 mm x 25 mm (2" X 1") wooden batten/center spine of clear pine or stronger – a full subdeck is not required.
• Provide front-to-back support underneath the surface every 500-600 mm (20-24").
• Provide additional support for any cabinets wider than 600 mm (24").
• For cutouts longer than 600 mm (24"), it is recommended to provide side-to-side support beams under the surface where possible.
• Verify that the countertop is sufficiently supported in areas of seams, cutouts and over spaces for appliances such as dishwashers, ovens, washing machines, etc.
• Provide support under all countertop seams.
• Attach a solid top on top of undercounter appliances that generate heat apart from in the case of fully integrated appliances with integral heat insulation where it would prevent proper alignment with the cabinet doors.

Full information on this topic can be found in the Fabrication & Installation Guide.

Post-installation: Cleaning, Damage by Cleaning Materials, Sealer

POST-INSTALLATION

9. Post-installation Cleaning

ADHESIVE OR SILICONE RESIDUE LEFT ON COUNTERTOP AFTER INSTALLATION 

Cause
Countertop not properly cleaned after installation

Solution

Thorough post-installation cleaning of dried adhesive or silicone residue is of paramount importance as it reduces time-consuming and costly remedial work.

• Pour a small amount of an oxalic acid-based cleaning material such as Bar Keepers Friend® Cleanser (powder) in the center of a paper towel.
• Pour lacquer thinner for dried adhesive, or denatured alcohol for silicone residue, directly on the powder and mix into toothpaste consistency.
• Gently rub in a circular motion (like waxing a car) about 4 sq ft / 0.4 m2 of surface around the affected area for no more than one minute.
• Wipe the mixture away with water and/or a glass cleaner such as Windex® to neutralize the chemicals.
• The process may need to be repeated over the whole surface if it is over 6 months old or if sealer was applied.

Wear rubber gloves for this procedure.

Full information on this topic can be found in the Fabrication & Installation Guide.

10. Damage by Cleaning Materials

FACTORY SURFACE FINISH DAMAGED BY USE OF UNSUITABLE CLEANING MATERIALS 

Cause
Factory surface finish damaged by use of unsuitable cleaning materials

Solution

• Do not allow your Caesarstone surface to come into contact with strong acids or alkalis, oxidizers or similar materials, regardless of pH.
• Do not use harsh cleaning products such as: oven/grill cleaners, dishwasher polishing agents, lye, caustic soda, paint strippers or any products containing trichloroethane or methylene chloride.
• Do not use wax, sealers or other materials that may leave a film on the countertop.
• Use of acetone is forbidden on Caesarstone surfaces. Alcohol is recommended for cleaning during installation.
• Do not use abrasive scourers or Mr. Clean Magic Eraser as they can damage the finish/sheen of your surface.
• If the surface comes into contact with any products that might damage it, rinse immediately with plenty of water.

Full information on this topic can be found in the Fabrication & Installation Guide.

11. Sealer

STAINS CAUSED BY USE OF SEALER 

Cause
Use of sealer

Solution
Do not use wax, sealers or other materials that may leave a film on the countertop.

Full information on this topic can be found in the Fabrication & Installation Guide.

Click here for the full Caesarstone Surfaces Fabrication & Installation Guide.