Installing a granite countertop in a kitchen can transform the space. Granite counters are durable, natural products that look good. Like other natural products, they can also have occasional fissures or weak spots within the slab. To support the slab, protect from weak spots and ensure that your counter is long-lived, plywood or medium-density fiberboard (MDF) must be installed beneath the counter as a support.
- Skill level:
- Moderately Easy
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Things you need
- 5/8-inch plywood or MDF sheets, 24 inches wide
- Power screwdriver
Lay out 5/8-inch sheets of plywood directly on top of your kitchen cabinets. Line up the sheets so that all areas of the cabinetry are covered, except for your sink base or hob cutout. The front edge of the cabinets should be left bare, so that the plywood sits into the cabinets slightly, allowing the granite to sit on the front edge of the cabinets' top.
Mark the stiles or sides of the cabinet that extend backward beneath the plywood with a pencil mark on top of the plywood. Look at the fronts of your cabinets to find the stiles.
Drive screws through the plywood into the cabinet stiles every few cabinets to secure the plywood to the cabinets, using the power screwdriver. The granite will rest on top of the front edge of the cabinet, and will be supported underneath by the plywood, which will be flush with the front edge of the cabinet, extending back to the wall.
Tips and warnings
- If you are unable to cover all of your base cabinets in plywood or MDF, cover areas with granite seams. This could be at a turn in a run of cabinets, or at the beginning or end of a run of cabinets. Seams are weaker spots and are the most important areas to reinforce.
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