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A small floor-height change can make a doorway transition awkward
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How much finished-height difference can a reducer or threshold handle before it becomes a noticeable trip edge? I’m also wondering when it’s better to adjust the floor build-up so the two surfaces meet more nearly flush, rather than trying to cover the difference with trim.
The answer probably depends on the flooring on each side and whether the transition is in a doorway or an open passage. How do expansion gaps and each floor’s fastening requirements affect the choice? I’d be interested in what details you’d want to know before recommending one approach.
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A doorway adds a constraint beyond the height difference: the transition has to fit the flooring maker’s permitted profile and leave enough clearance for the door to swing. If no suitable profile fits, compare adjusting the floor build-up against the floors’ installation requirements rather than forcing in a taller trim. Without the actual products and measurements, I wouldn’t put a universal number on when an edge becomes a trip hazard.
The expansion gap can rule out some otherwise tidy-looking transitions. With a floating floor, the trim generally needs to hold down on the subfloor without pinning the flooring; fastening through the floating floor can stop it moving as intended. If the profile can’t cover the required gap and stay secure without trapping the floor, the build-up or transition detail needs another approach. A flush-looking joint isn’t worth locking the floor in place.
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