Renovation guides

How to install floor transition strips yourself: step by step

Quick review by a licensed contractor on Oct 7, 2026. This is not a certification. Follow product labels where they differ.

Where your floor stops at a doorway, a strip covers the gap. Many plank floors require a break at every doorway; some allow continuous runs up to a set length — your floor's instructions decide. The T-molding and its track were bought with the floor.

Difficulty 1 of 5 · about half a day · you can do this

Photo of your room, the look you pick, then this guide with the materials counted for your room.

Step by step

1. Step 1 of 9

   List every doorway and what meets what

   

   Walk the apartment and write down each opening with the two floor types on either side: plank to tile, plank to plank, plank to carpet, plank to slab. Include closets and the entry, and mark which doorways your floor's instructions say need a break.

2. Step 2 of 9

   Pick the profile for each opening

   

   Set a straightedge across the doorway and compare the two finished heights. Equal height takes a T-molding — the one you bought with the floor; a step down takes a reducer; an exposed edge at carpet or a slider track takes an end cap.

3. Step 3 of 9

   Check the expansion gap under the doorway

   

   Look into the gap between the two floors — you should see about 1/4" (6 mm) of clear space on each side, straight down to the subfloor. If a plank runs tight to the other floor, trim it back now with a utility knife or a multi-tool.

4. Step 4 of 9

   Measure the width between the casings

   

   Measure at the narrowest point of the opening, at floor level, not at the wall faces. Write the number on a piece of tape and stick it in that doorway.

5. Step 5 of 9

   Cut the track shorter than the opening

   

   Cut the metal or plastic track that came with the molding about 1/2" shorter than the measured width so it drops into the gap without binding. Test-fit it in the doorway before you fasten anything.

6. Step 6 of 9

   Fasten the track to the subfloor only

   

   Center the track in the gap and screw it down into the subfloor between the two floors. On a slab, drill with a masonry bit and use the supplied anchors, or run a bead of construction adhesive instead of drilling — but never put a fastener through a floating floor.

7. Step 7 of 9

   Cut the molding to length and test-fit it

   

   Cut the visible molding to the width between the casings with a fine-tooth blade, cutting slowly so the finish does not chip. Hold it in place and check that it covers the gap on both sides before you commit.

8. Step 8 of 9

   Snap the molding into the track

   

   Line the molding up over the track and tap it home with a rubber mallet through a scrap block so you do not dent the finish. Work from one end to the other until it seats flat along the whole length.

9. Step 9 of 9

   Walk every doorway barefoot

   

   Step across each transition and rock your weight on it. Nothing should move, click, or lift at the edge — if it does, the track needs another fastener or the molding is cut too long. Then swing every door over its new strip: if it drags, the door needs trimming before you move on.

   Quality check

   • Every doorway where your floor's instructions require a break has a strip, and every edge where the floor stops is covered
   • No fastener goes through a floating floor anywhere
   • The expansion gap is still open on both sides of each track
   • Each strip sits flat with no rocking or clicking underfoot
   • Profiles match the height difference: T-molding, reducer, or end cap
   • No chipped or dented finish on the visible molding
   • Every door swings over its strip without dragging

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