Do I Need to Caulk Between a Backsplash and Counter?

Water Damage

• Even the most careful dishwasher or cook may find it difficult to keep water from splashing onto the backsplash or the wall behind the countertop. Without a bead of caulk to seal the top edge of the countertop, the water will run down behind the base cabinets and eventually cause mold and rot. Regardless of the type of countertop -- whether it be granite, marble, stainless steel or laminate -- it should be sealed with caulk at the backsplash to prevent costly water damage.

Built-In Backsplash

• Some countertops have a built-in backsplash. Post-form laminate countertops available in home centers and lumber yards are examples of this type of construction. There is no need to caulk between the counter and the backsplash for these countertops, as they are covered with one continuous piece of laminate. Where the counter backsplash and the wall -- also referred to as a backsplash -- meet is a different story. This joint needs to have a bead of caulk to prevent water from working behind the counter and running down the wall behind the base cabinet.

Separate Backsplash

• Some countertops may have a backsplash that was added separately and is not integral to the countertop. This type of arrangement requires a bead a caulk to seal the rear edge of the countertop to the bottom of the backsplash, as well as a protective bead to seal the top rear edge of the backsplash to the rear wall.

Laminate Countertops

• Laminate countertops -- whether custom-made or purchased ready-made -- especially need a good bead of caulk where the top of the countertop meets the backsplash. The framework of a laminate countertop is usually constructed of particle board. If particle board gets wet, it will swell and damage the laminate surface.

Re-Caulking

• Caulking does not last forever. Expansion and contraction of the countertop, the backsplash or the wall will eventually create gaps in the caulking. In this case, the old caulking should be taken out with a caulking removal tool available in home centers or hardware stores. Once all the old caulking has been removed, a new bead of caulk can be applied to the joint with a caulking gun. The key to an effective caulking job is to apply the bead at a steady, consistent rate. Smooth out the bead with a caulk application tool and wipe up the excess with a rag.