Why must base cabinets be level before countertops are installed?
Level cabinets provide continuous support and reduce stress that can crack slabs, open seams, or create uneven surfaces.
A rigid slab should not be forced to follow severely uneven cabinet tops.
Small approved shims may correct limited variation, but major problems require cabinet adjustment.
Cabinets must also be securely attached to walls and one another.
Large islands and peninsulas should be checked for twist, movement, and consistent height before templating.