Hybrid flooring trims and stairs

A hybrid floor is a floating floor. The planks click together and lie on the subfloor, which is the floor under your new floor. They are not glued or nailed down. The floor is laid with a gap at every wall, so it can move. Trims cover that gap. They are also called edging, edge trims, profiles or accessories. Other strips join the floor to the next floor at a doorway. Stairs have their own rules. In November 2026 we read the installation instructions of 12 suppliers of hybrid flooring. This guide shows what they state. Your own floor comes with its own installation instructions. Follow those.

Does hybrid flooring expand?

Yes, a little. A hybrid floor grows and shrinks as the room gets warmer and cooler. All 12 suppliers ask for a gap at the walls for this reason. The gap is called an expansion gap. One supplier gives a general figure: 1.5 mm for every metre of the floor's width and length. The trims in this guide hide the gap and let the floor move under them.

Skirting and scotia for hybrid flooring

Skirting and scotia are the two most common covers for the gap at a wall. Suppliers also name other trims.

• Skirting. This is the board along the bottom of the wall. When it is fitted after the floor, it sits over the gap.
• Scotia. This is a small strip with a curved face. It is fitted in front of a skirting board that stays on the wall.

Suppliers state three rules for them.

• Never fixed to the floor. All 12 suppliers state this. A trim that is fixed to the planks holds the floor, so it cannot move. 6 suppliers add that the trim is fixed to the wall or to the skirting.
• A little space over the floor. 4 suppliers state a small space between the trim and the floor. Two of them give its size: 0.5 mm and 1 mm.
• Wide enough for the gap. One supplier recommends a scotia or skirting of 15 to 20 mm.

Hybrid flooring without scotia

You can have a hybrid floor without scotia. Skirting then covers the gap. 7 of the 12 suppliers state one of these two ways.

• Take the skirting boards off, lay the floor, and fit skirting over the gap afterwards.
• Undercut the skirting. This means the bottom of the skirting board is cut away, so the floor slides under it.

Silicone and caulking

Caulking is a soft filler that is pressed into a gap from a tube. All 12 suppliers state a rule against silicone or caulking at the edge of a floating floor. A filled gap stops the floor moving. They state a few exceptions.

• Bathrooms and laundries. 5 suppliers name silicone or another flexible sealant for the edge of the floor in these rooms. The rules for these rooms differ from supplier to supplier.
• Pipes. 1 supplier accepts a little caulking around pipes.
• Thick planks. 1 supplier accepts a line of silicone over the 3 mm gap at the walls, for its thickest planks.

So read your instructions before any sealant goes near the floor.

Hybrid flooring transition strips and expansion joints

A transition strip covers the join between two floors. An expansion joint is a gap inside a large floor, or in a doorway, with a strip over it. Suppliers name these strips.

• T-mould. A strip shaped like the letter T. It covers the gap between two floors of the same height. 3 suppliers name it.
• Reducer. A strip that slopes down to a lower floor. 1 supplier names it for a lower floor and for the place where the hybrid floor meets carpet.
• Threshold strip. 1 supplier names it at doorways, as the change from one kind of floor to another.
• H trim and C trim. 1 supplier names these for doorways and between rooms. An H trim covers the gap between two floors, like a T-mould. A C trim is also called a C channel or an end cap. It finishes the edge of the floor where there is no skirting, such as at a sliding door.

Where a hybrid floor meets tiles or carpet, the strip depends on the two heights: a T-mould for floors of the same height, and a reducer for a lower floor.

Many strips sit in a base or a track, which is a thin rail under the strip. 4 suppliers state that this base is glued, screwed or nailed in place, and 3 of them name the subfloor. So the strip is held by the subfloor, not by the planks.

Where does a floor need an expansion joint? 11 of the 12 suppliers state how large a floor may be before it needs one. The sizes are from 8 m by 12 m to 20 m by 20 m, or a length of 12 to 15 m in one direction. Most suppliers also speak of a joint in doorways between rooms.

Hybrid flooring on stairs

Stairs have their own rules. This is what the 12 suppliers state.

• Glued, not floating. 7 of the 12 suppliers state that planks on stairs are glued to the step.
• Stair nosing. This is the strip on the front edge of each step. 6 suppliers name a stair nosing or a stair moulding. It is glued. Some instructions also screw it down, or push it into a plastic track on the step.
• Underlay off. The attached underlay is the thin soft layer under each plank. 3 suppliers state that it is taken off a plank before the plank is glued to a step. 2 more give both answers in different places, so ask the supplier of your floor.
• The top step. 2 suppliers state a gap where the top step meets a floating floor upstairs.
• Wait for the glue. 1 supplier states that nobody walks on the stairs until the glue has fully set, as the glue maker's instructions say.

4 of the 12 suppliers give no rule for stairs, and 1 speaks only of the stair moulding. If you want hybrid flooring on your stairs, ask the supplier of your floor for its stair instructions and its stair nosing.