A floor threshold (also called a transition strip) is the piece that bridges two flooring surfaces or finishes the doorway edge. It can help cover seams, protect exposed edges, smooth small height changes, and, at exterior doors, improve the seal when paired with inserts or weatherstripping.

• Materials: Aluminum, wood, and PVC/vinyl are common.
• Profiles: Flat, overlap, reducer, and ramp styles.
• Uses: Carpet-to-tile, laminate-to-vinyl, and garage or entry transitions.
• Installation: Self-adhesive options or screw-down designs, depending on the product.

Choosing the right type depends on your floors, height difference, and location.

Attaching to concrete can be done with anchors or adhesive. Here’s a general approach:

1. Dry-fit: Place the threshold, mark its position, and cut to length if needed.
2. Pick a method: Masonry anchors with screws or a construction adhesive rated for concrete.
3. If screwing: Use pre-drilled holes (or drill carefully). Mark, drill pilot holes with a masonry bit, and set plastic anchors.
4. Adhesive: Apply a thin bead, press the threshold in place, and clean any squeeze-out.
5. Finish: Drive screws, check for level, and allow adhesives to cure per instructions.

Conditions vary, so always follow the product’s directions and use appropriate safety gear.

Uneven floors often benefit from reducer or ramp-style thresholds designed to bridge height differences. Overlap profiles can hide edges, and flexible self-adhesive PVC strips may contour to minor irregularities.

• Measure the offset: Check the exact height difference before buying.
• Choose the profile: Reducers or ramps can help soften the transition.
• Shim or taper: For larger variations, a tapered wood threshold or shims under one side may help.
• Adhesion: Use adhesives suited to your subfloor to limit movement.
• Check specs: Many products list the supported height range; results can vary by surface.

Threshold: A removable/add-on strip installed on the floor to transition between surfaces, cover gaps, and help seal a doorway. It comes in various materials (aluminum, wood, PVC) and profiles (flat, overlap, reducer, ramp).

Sill: The structural base of the door frame at the bottom. On exterior doors, it’s part of the assembly that supports the door and manages water. Many adjustable thresholds or vinyl inserts attach to or sit over the sill to improve the seal.

In short, the sill is part of the door structure, while the threshold is the finishing or bridging piece you install.

Good measurements make choosing easier:

1. Width: Measure the clear opening from jamb to jamb. Select a length that covers it; many interior openings are around 36 inches, but verify.
2. Height change: Note any difference between the two floors to pick flat, reducer, or ramp styles.
3. Profile width: Choose a width that covers the seam and protects edges; options range from narrow trims to wider 5–6 inch styles.
4. Material match: Confirm it suits carpet, tile, laminate, or vinyl.

Many thresholds can be cut to fit (fine-tooth saw for wood/metal, utility knife for some PVC). On Walmart.com, you can filter by length, material, and check pickup or delivery options.