Yes, it is common practice to install a countertop directly on top of cabinets. In fact, this is the typical method of countertop installation in most kitchens and bathrooms. The cabinets provide a sturdy and level base for the countertop to sit on.
During installation, the cabinets are first leveled and secured in place. Then, the countertop material, such as granite, quartz, laminate, or wood, is cut to fit the dimensions of the cabinets and placed on top. The countertop may be attached to the cabinets using screws or adhesive, depending on the specific installation requirements.
It's important to ensure that the cabinets are structurally sound and capable of supporting the weight of the countertop material. If you're planning to install a heavy or large countertop, it may be necessary to reinforce the cabinets or consult with a professional installer to ensure proper support.
Additionally, some countertop materials may require additional supports or bracing, especially over spans where there are no cabinets or where there are cutouts for sinks or cooktops. In such cases, additional measures are taken to provide adequate support for the countertop material.
Overall, installing a countertop directly on top of cabinets is a standard and widely accepted method, as long as the cabinets are properly prepared and capable of supporting the chosen countertop material.