Both Silestone and Zodiac engineered quartz countertops are offered in
2 cm and 3 cm thicknesses. I inquired at both manufacturers about the
advantage of having the thicker product other than appearance. I just
received an answer from a representative at Dupont (Zodiac) and the
answer was:

"Thank you for your interest in Zodiaq® quartz surfaces. Please visit
your local kitchen designer at your Zodiaq® Retailer to help you
create a kitchen to meet your individual style. Their Zodiaq
installer/fabricator can explain which thickness would best suit your
design."

I consider this to be an evasive answer. I haven't heard yet from
Silestone. If the product is mounted on a stable base, why should I
spend the extra money for the thicker countertop?
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Bill Burlingame