How to Install Baseboards Correctly

Baseboards are the finishing touch that makes a room look complete and polished. They cover the gap between the wall and floor, protect the wall from scuffs, and add architectural character. Installing them correctly is a skill that pays dividends in every room of your home. Here's a complete guide.

What You'll Need

• Flexible peel-and-stick molding trim: 32.8ft Flexible Peel and Stick Molding Trim, White
• Miter saw: SKIL 10" Dual Bevel Sliding Compound Miter Saw
• Brad nailer: Metabo HPT Brad Nailer 18 Gauge NT50AE2
• Finish nails: Mr. Pen Nail Assortment Kit, 600 Pcs
• Stud finder: Stud Finder Wall Scanner 5-in-1
• Laser level: Laser Level Line Tool by AikTryee
• Construction adhesive: Loctite PL Premium Construction Adhesive
• Caulk gun kit: Professional Caulk Gun Kit 5-in-1
• Silicone caulk: GE Advanced Silicone Caulk, Clear
• Wood filler: BONCART Wood Filler White, Paintable
• Painter's tape: ScotchBlue Original Painter's Tape
• Sandpaper: Atosun 45PCS Sandpaper Set

Step 1: Measure and Plan

Measure each wall and add 10% for waste. Sketch the room and note which walls get inside corners (most common) and which get outside corners (at room protrusions). Plan your installation order — start with the wall opposite the door so any imperfect cuts are less visible.

Step 2: Find the Studs

Use the stud finder to locate all wall studs and mark them with a light pencil mark near the floor. Baseboards must be nailed into studs for a secure hold — nailing into drywall alone will cause them to pop loose over time.

Step 3: Cut the Pieces

Use the SKIL miter saw to cut your baseboard pieces. For inside corners, cut two pieces at 45 degrees mitered toward each other. For outside corners, cut two pieces at 45 degrees mitered away from each other. For straight runs, cut square (90 degrees). Always measure twice and cut once — baseboard is unforgiving of short cuts.

Step 4: Install the Baseboards

Apply a thin bead of Loctite PL construction adhesive to the back of the baseboard. Press firmly against the wall and nail with the Metabo HPT brad nailer using finish nails into every stud. Drive nails at a slight downward angle for better holding power. Keep the bottom of the baseboard tight to the floor.

Step 5: Handle Gaps and Uneven Floors

If the floor is uneven and the baseboard doesn't sit flat, use a laser level to keep the top of the baseboard level, and fill the gap at the bottom with caulk. This is far easier than trying to scribe the baseboard to an uneven floor.

Step 6: Fill, Caulk, and Paint

Fill all nail holes with BONCART wood filler, let dry, and sand smooth. Caulk the top edge where the baseboard meets the wall and the bottom edge where it meets the floor using the caulk gun and GE silicone caulk. Apply painter's tape and paint with semi-gloss white for a crisp, classic finish.

Pro Tips

• For a beginner-friendly option, use flexible peel-and-stick molding trim — no cuts needed, just press into place.
• Cope inside corners instead of mitering for a tighter, more professional fit — especially in older homes where corners are rarely perfectly square.
• Leave a 1/8" gap at door casings rather than trying to fit the baseboard perfectly — caulk fills it invisibly.
• Install baseboards before painting the walls — it's much easier to cut in paint along the top of the baseboard than to tape it off.
• For rooms with carpet, install baseboards before the carpet is laid — the carpet tucks under the baseboard for a clean finish.