Other installations, such as when the countertop has been shipped, should be done by a contractor experienced in installing countertops. Rates for this would vary by region of the country. The countertops arrive to the site in a completed state and there should be no modifications required. Most of the concrete countertop contractors provide detailed installation instructions. Request these instructions and make sure your installer understands the installation instructions prior to the countertops arriving on the jobsite these are custom, one of a kind products.
Larger thickness is also possible and is done for aesthetic reasons.
The countertop weight can be less if lightweight concrete is used. Though some countertop contractors will not use lightweight concrete because it has less strength. Most building codes require a minimum design load for a floor of about 65lbs per square foot. A typical cabinet will support the concrete weight. Like most decorative concrete systems, you may choose from a wide range of colorings for your countertops.