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How to Install Crown Molding
Crown molding adds noticeable resale value to a room and looks better than most DIYers expect — the hard part is cutting outside corners on a compound miter saw. This walks through choosing molding, the miter cuts, attaching with a nail gun (rented if needed), and the caulk pass that hides every imperfection.
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0 of 5 steps completedStep-by-Step Instructions
1 Step 1: Pick crown molding
Step 1: Pick crown molding
MDF molding is half the price of solid wood and paints to the same finish — the modern default. Solid pine is the upgrade if you want to stain. Polyurethane (PVC) is the easy pick for bathrooms and humid rooms.
MDF crown molding, 3-5 inch profile
Pre-primed, paint-ready. Half the price of solid wood. Easy to cut, no splitting. ~$1-2 per linear ft.
Pine crown molding, 3-5 inch profile
Solid wood — best for stained finishes. Slightly more expensive. ~$3-5 per linear ft.
Polyurethane crown molding (PVC)
Plastic — no warping, perfect for bathrooms. Lighter, easier to handle. ~$2-4 per linear ft.
2 Step 2: Get a compound miter saw
Step 2: Get a compound miter saw
Crown molding needs precise 45° miter cuts. A 10" or 12" sliding compound miter saw is the right tool — rent one for a single-room project ($40/day at Home Depot) or buy if you have multiple rooms planned.
DEWALT DWS779 12" sliding compound miter saw
The pro standard. Smooth slide, accurate detents, lifetime alignment. ~$370-450.
Bosch GCM12SD 12" axial-glide miter saw
Glide system eliminates sliding rails — more accuracy in tight spots. Premium pick. ~$650-750.
Ryobi 10" sliding compound miter saw (budget)
Cheap battery-powered option. Acceptable for single-project use. ~$200-250.
Rent from Home Depot or Lowe's (single project)
Pro-quality DeWalt or Hitachi miter saws rent for $40-65 per day. Best if you only have one room.
3 Step 3: Get a finish nail gun
Step 3: Get a finish nail gun
Hand-nailing crown is brutal — every nail risks splitting the molding or denting the surface. An 18-gauge brad nailer is the right tool. Compressors are not required (battery-powered cordless brad nailers are excellent now).
DEWALT DCN680 20V cordless brad nailer
Battery-powered, no compressor needed. The best all-around home brad nailer. ~$230-280.
Ryobi P320 18V cordless brad nailer (budget)
Battery option at half the price. Acceptable for single-room project. ~$130-170.
Senco FinishPro pneumatic + air compressor
Pneumatic system. Best fire-rate and reliability if you have multiple rooms planned. ~$300-400 for nailer + small compressor.
18-gauge brad nails, 2-inch, 1000-pack
Match length to molding thickness. 2-inch goes through MDF and into framing. ~$10-15.
4 Step 4: Cut the corners (inside vs outside)
Step 4: Cut the corners (inside vs outside)
Crown molding is cut at compound angles — both miter (left-right) and bevel (tilt). Two common methods: 'flat on the table' (uses bevel) or 'nested upside-down' (the original 1950s method, no bevel). Nested-upside-down is more forgiving for beginners.
Warning: Always cut on scrap first to confirm the angle is right. Crown molding cuts are notoriously easy to flip incorrectly — measure twice, cut once.
Nested upside-down method
Stand the molding against the saw fence upside-down — ceiling-side on table, wall-side against fence. 45° miter only, no bevel. Easier for beginners.
Flat-on-table method (compound bevel)
Lay molding flat on saw table. Miter angle varies by molding spring angle (38° or 45°), bevel set on the saw. More material capacity but harder to set up.
Inside corner: cope joint (advanced)
Cut one piece square, cut the mating piece's profile with a coping saw to nest over it. Hides any wall-corner imperfection. Pros use this everywhere.
5 Step 5: Nail it up, caulk every seam
Step 5: Nail it up, caulk every seam
Hold molding tight to ceiling and wall, fire 2-inch brads at 16" intervals into wall studs and ceiling joists. After all molding is up, caulk the gap at ceiling, at wall, and at every joint. Caulk is what makes amateur crown look pro.
Paintable acrylic latex caulk + caulk gun
DAP Alex Plus white. Run a small bead at every gap, wipe with damp finger or rag. Hides everything. ~$5 per tube.
Caulk gun (Newborn 250 Drip-Free)
Drip-free trigger prevents waste. ~$15-22.
Fill nail holes with spackle, sand, paint
DAP DryDex spackle goes on pink and dries white — visual cue when dry. Sand with 220-grit, prime, paint to match the wall.
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