Fix Loose Baseboard Trim

Baseboard trim pulls away from walls for predictable reasons. Wood shrinks as it dries. Houses settle and shift. Old adhesive loses grip. The gap between baseboard and wall might be a hairline crack or a quarter-inch canyon, but the fix is the same: reattach it properly so it stays put for decades, not months. The work itself takes an hour for a single room, but doing it right means understanding what failed the first time. Most loose baseboard was installed with too few nails, no adhesive, or nails driven into drywall instead of studs. Your fix addresses all three failures at once. When you're done, the trim should sit flush, feel solid when you press it, and show no visible fasteners.

1. Remove the loose section completely. Use a putty knife to gently pry the baseboard away from the wall, working from the loose end toward the secure sections. Slide a thin wood shim behind the board to protect the wall as you pry. Pull out old nails from the back of the trim with pliers, not through the face where they'll tear the wood.
2. Clean both surfaces thoroughly. Scrape off old adhesive, paint drips, and dust from both the back of the baseboard and the wall surface. Use a putty knife for dried adhesive and a damp rag for dust. The cleaner these surfaces, the better your new adhesive will bond.
3. Apply construction adhesive. Run a continuous bead of construction adhesive along the back of the baseboard, about half an inch from the bottom edge. Use a product rated for wood-to-drywall bonding. The bead should be thick enough to squeeze slightly when pressed but not so heavy it oozes out the top.
4. Position and press the baseboard. Set the baseboard against the wall and press firmly along its entire length. Have someone hold it in position or use painter's tape to temporarily secure it while you work. Check that the top edge sits flush and the board follows the wall contour without gaps.
5. Nail into studs at an angle. Drive 2-inch finish nails through the baseboard into wall studs at a slight downward angle. Space nails every 16 inches along studs, placing them about an inch from the top of the baseboard. Use a nail set to sink each nail head just below the wood surface without crushing the surrounding area.
6. Add bottom nails if there's a gap. If the baseboard doesn't sit flush with the floor, drive finish nails at a steep angle through the bottom edge into the floor plate. These nails close the gap and prevent the bottom edge from curling away over time.
7. Fill nail holes and joints. Fill each nail hole with wood filler that matches your trim color or paintable filler if you're repainting. Use your finger to press filler into the hole, overfilling slightly. Let dry completely, then sand flush with 150-grit sandpaper.
8. Caulk the top seam. Run a thin bead of paintable caulk along the seam where baseboard meets wall. Smooth with a wet finger or caulk tool, wiping away excess. This seals the joint and hides any remaining irregularities in the wall surface.