Not in this case. I have ordered the countertop online for half the price quoted by local installers. So, I am the installer.
This is a standard-size top for a standard-size vanity cabinet, standing against an open wall in a bathroom- no precision fit, not side splashes. The local fabricator insisted on sending someone to measure it, and then to install the top onto the cabinet, which is not a difficult task.
Since I posted, I found a kit supplied by the countertop vendor. Basically, you epoxy some anchor plates with bolts to the underside of the Silestone, and then screw clips and wingnuts onto them. They tell me they use an epoxy formulated for bonding metal and stone.
We had an undermount SS sink installed with our Silestone countertop. The sink itself was sandwiched between the 3/4" ply substrate and the actual countertop itself....
No clips were used. Epoxy on the sink and a whole whack of epoxy on small pieces of plywood overlapping the edges of the sink where it would fit within the confines of the cabinet. It is still holding after three months.
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