How to Fix Swollen Wood Furniture

Wood swells when it absorbs moisture — a drawer that suddenly won't open, a door that sticks, a tabletop that's no longer flat. It's a common problem, especially in humid climates or after water exposure. The good news is that swollen wood furniture is very fixable. Here's how.

What You'll Need

• Orbital sander: DEWALT 20V MAX Orbital Sander
• Sandpaper: Atosun 45PCS Sandpaper Set
• Sanding sponges: Romeda 8-Pack Sanding Sponge
• Tack cloth: Dura-Gold Pure Gold Tack Cloth, 12-Pack
• Wood stain: Minwax Wood Finish, Dark Walnut
• Topcoat: General Finishes High Performance Water Based Topcoat, Satin
• Foam brushes: Bates Foam Paint Brushes, 16-Pack
• Steam iron: BLACK+DECKER Steam Iron IR1350S
• Heat gun: Heat Gun 380W, 2-Temp Settings

Step 1: Dry the Wood First

Before any repair, the wood must dry out completely. Move the piece to a warm, dry area with good airflow. A dehumidifier speeds the process significantly. Allow at least 24–48 hours — longer for heavily saturated pieces. As the wood dries, it will often shrink back close to its original dimensions on its own.

Step 2: Assess What's Swollen

Different parts of furniture swell differently:

• Drawers: The most common swelling problem. The drawer box absorbs moisture and expands, making it stick or jam.
• Doors and panels: Flat panels swell across the grain, causing them to stick in their frames or bow.
• Tabletops: Swell and may cup or bow, especially if only one side was exposed to moisture.
• Joints: Swelling can cause joints to crack or open as the wood moves.

Fix Swollen Drawers

Once dry, test the drawer. If it still sticks, the wood hasn't fully returned to size. Sand the sides and bottom edges of the drawer with 80-grit sandpaper using sanding sponges, removing material until the drawer slides smoothly. Sand evenly on both sides to maintain balance. Once it fits, seal all surfaces of the drawer (including the inside) with topcoat to prevent future swelling.

Fix Swollen Panels and Doors

After drying, use the DEWALT orbital sander with 80-grit to sand the edges of the panel or door until it fits its frame properly. Work gradually — remove a little at a time and test the fit frequently. Finish with 120-grit, then 220-grit for a smooth edge. Seal all edges with topcoat.

Fix a Swollen Tabletop

For a tabletop that has cupped or bowed from moisture, place it concave-side down on a flat surface. Dampen the convex (high) side with a wet cloth and place heavy weights on top. Leave for 24–48 hours. The moisture equalizes through the wood and the weight flattens the bow. Once flat, sand smooth and refinish.

Speed Up Drying with Heat

For stubborn swelling, use a heat gun on low setting to gently warm the swollen area, encouraging moisture to evaporate faster. Keep the gun moving and maintain 6–8 inches distance to avoid scorching. Alternatively, use the steam iron on a dry cloth to draw moisture out of the surface.

Prevent Future Swelling

After repair, seal all wood surfaces — including undersides, drawer interiors, and back panels — with 2 coats of General Finishes Topcoat. Unfinished wood surfaces are the primary entry point for moisture. A fully sealed piece is far more resistant to future swelling.

Pro Tips

• Never force a swollen drawer — forcing it can split the drawer box or damage the slides.
• Sand drawer edges gradually and test frequently — it's easy to remove too much.
• In humid climates, use a dehumidifier to maintain indoor humidity below 50% to prevent wood swelling.
• Wax the sides of drawers after repair for smoother operation and moisture resistance.