Quartz countertops are a popular choice for modern kitchens and bathrooms due to their durability, stain resistance, and stylish appearance. While quartz slabs are typically manufactured at a standard thickness of 3/4 inch, it is possible to glue multiple slabs together to achieve a thicker quartz countertop. Here is what you need to know about gluing quartz countertops together.
Why Glue Quartz Countertops Together?
There are a few reasons why homeowners or contractors may want to glue quartz slabs together:
- Achieve a thicker countertop – Gluing slabs together allows you to create a thicker quartz countertop, such as 1 1/4 or 1 1/2 inches thick. The added thickness provides extra durability and heft.
- Level uneven base cabinets – Gluing an additional thin slab underneath can help level out uneven cabinet bases.
- Add support – Long span or overhang areas can benefit from the added support of an extra slab underneath.
- Create thicker edges – Gluing on side strips creates thicker edges and a more substantial appearance.
- Salvage remnants – Small leftover quartz pieces can be glued together to form larger slabs.
What Type of Adhesive Works Best?
Not all adhesives are suitable for bonding quartz. Here are some guidelines:
- Use a high-quality polyurethane or silicone adhesive specifically designed for quartz and natural stone.
- Avoid standard construction adhesives like Liquid Nails. These do not provide an adequate bond.
- Epoxy adhesives also do not work well, as they cure too rigidly. Flexible bonding is needed.
- The adhesive must be formulated for non-porous materials and withstand temperatures up to 212°F.
Popular name-brand quartz adhesives include Akemi, Tenax, and Gorilla Glue. Always consult the manufacturer’s instructions.
How to Glue Quartz Slabs Together
Gluing quartz correctly takes skill and the right process:
- Ensure the quartz slabs are clean and free of debris or coatings. Roughen smooth edges for better adhesion.
- Apply the adhesive evenly to both slabs per the product instructions. Use a notched trowel to control adhesive thickness.
- Let the adhesive become tacky but not fully cured before joining slabs. This is called the “open time.”
- Clamp the slabs together firmly and evenly. Adjust alignment before adhesive cures.
- Clean up any adhesive squeeze-out immediately with alcohol.
- Add shims if needed to ensure levelness as the adhesive cures fully.
- Avoid moving or stressing the joint until the adhesive has reached full bond strength.
Does Gluing Impact Seam Appearance?
Gluing quartz slabs introduces seams that are often, but not always, visible:
- Proper adhesive selection and workmanship can minimize seam visibility.
- Seams are more apparent with certain quartz patterns or darker colors.
- Light colors and particle-style patterns can obscure seams.
- A skilled fabricator can strategically place seams to be less noticeable.
- Seams should feel smooth and level, with tight spacing. Uneven gaps indicate improper installation.
Things to Keep in Mind
There are a few considerations when gluing multiple quartz slabs:
- The finished countertop may have increased weight, requiring cabinet reinforcement.
- Movement or shifting can still occur if bonding fails, causing seam separation.
- Glueing slabs together takes skill and is best left to an experienced quartz fabricator.
- The installation cost is increased compared to a standard single slab.
- Expect the project timeline to be extended due to adhesive cure times.
Conclusion
While joining quartz slabs takes specialty adhesives and careful technique, it can be an effective way to achieve a thicker, stronger, or more visually appealing quartz countertop. With proper planning and an experienced installer, glued quartz seams can result in beautiful, durable finished products. Be sure to discuss options with your countertop professional.