Covering the expansion gap
There are two honest ways to hide the gap at the wall, and they produce different looks and different budgets.
- Shoe molding or quarter round over existing baseboard: faster, less invasive, adds a visible extra profile at the floor line
- Remove and reinstall baseboard: cleaner single-profile look, adds labor plus caulk and paint touch-up
- New taller baseboard: often chosen during a whole-home LVP project since the base is coming off anyway
Transition profiles and when each is correct
The right profile depends on what the LVP is meeting and whether the two surfaces are the same height.
- T-molding: two hard surfaces at the same height, and for breaking up very long floating runs
- Reducer: LVP meeting a lower surface such as sheet vinyl or an unfinished slab
- End cap or square nose: LVP terminating at a sliding door track, hearth, or exterior threshold
- Carpet transition: LVP meeting carpet, with the carpet edge tucked and secured properly
- Flush seam: possible where two hard surfaces are genuinely level and the products allow it, and worth the extra prep in open-concept spaces
Door jambs, casing, and undercuts
Planks should run under door jambs and casing, never be scribed around them. An undercut made with a jamb saw at the correct height lets the plank slide beneath, preserves the expansion gap out of sight, and eliminates the ragged caulk line that scribing produces.
Interior doors sometimes need trimming after a floor change, particularly when moving from low-pile carpet to LVP over new underlayment. We check swing clearance during the measure so it is part of the scope rather than a surprise.
Long runs, doorways, and where floors should break
Manufacturers publish a maximum uninterrupted run for floating floors, and open-concept Treasure Valley builds routinely exceed it. Where that happens, a T-molding at a natural doorway or archway is the correct solution, not an optional one — a floating field that exceeds its span will eventually peak or gap.
We plan those break points during layout so they land in doorways where a transition reads as intentional, rather than mid-room where it reads as a mistake.
Questions we get about trim & transitions
- Do I have to have quarter round?
- No. Pulling and reinstalling the baseboard gives a single clean profile at the floor line. It costs more in labor and usually needs paint touch-up afterward, so it comes down to look versus budget. We quote both.
- Can I avoid transitions between rooms?
- Often, but not always. Floating floors have a published maximum uninterrupted run, and long or L-shaped layouts can exceed it. Glue-down LVP has no such limit, which is one of the reasons we sometimes recommend it in large open plans.
- Will my doors still close after the new floor goes in?
- We check clearance during the measure. Going from carpet to LVP usually lowers the finished height slightly, which is fine; going from a thin vinyl to LVP over underlayment can raise it enough to need a door trimmed.
- How do you handle the transition to tile in a bathroom?
- It depends on the relative heights. Level surfaces can take a T-molding or, with enough prep, a flush seam. A height difference calls for a reducer. Either way the LVP edge stays covered and the expansion gap is preserved.