Hybrid Flooring Problems: Peaking, Gaps and Hollow Sounds, and How to Prevent Them

The short answer

Hybrid flooring has a rigid stone-plastic core, a printed timber-look surface and a protective wear layer, and it clicks together as a floating floor. It is a forgiving, stable product, which is why it is so widely used in Gold Coast homes. When a hybrid floor goes wrong, the cause is almost always what is underneath it or around its edges rather than the planks themselves.

Four complaints come up again and again with floating floors: joins lifting into a ridge (peaking), gaps opening between planks, a hollow or clicking sound underfoot, and planks that dip or flex when you walk on them. This guide explains what causes each one, how to tell them apart, and the preparation and installation steps that prevent them on a new floor.

Peaking: when planks lift at the joins

Peaking is when two rows of planks push up against each other and form a raised ridge, usually along a long run, through a doorway or where the floor meets a fixed object. It happens when a floating floor expands and has nowhere to go. Hybrid is far more stable than laminate or timber, but every floating floor still moves slightly with temperature, and over a long run that small movement adds up.

The usual causes are an expansion gap at the walls that is too small or has been filled with silicone or grout, skirting or scotia that has been nailed through the floor rather than into the wall, a run that is longer than the manufacturer allows without an expansion break, or a heavy object such as a kitchen island or built-in cabinet sitting on top of the floating floor and pinning it in place.

• Leave the expansion gap the manufacturer specifies around every wall, column and fixed object
• Fix scotia and skirting to the wall, never down through the floor
• Plan expansion breaks for long runs and between separate rooms where the instructions call for them, and place them neatly under doors
• Install cabinetry and islands before the floor, or run the floor up to them with a gap, rather than standing them on the floating floor
• Undercut door jambs and architraves so planks can slide under them with room to move

Gaps opening between planks

Small gaps at the ends or along the long edges of planks are usually a sign that the click joints have not fully locked, or that they have been strained. A joint that was not tapped home properly during installation can open slowly as the floor is walked on. Joints are also strained when the floor flexes over a dip in the slab, because each step works the joint up and down until it lets go.

Gaps can also appear when a floor has been pinned in one area and still moves elsewhere, so the movement is concentrated in a few joints. In very sunny rooms, planks that bake behind large glass doors can move more than planks in shaded areas, which is another reason expansion allowances matter on the Gold Coast.

Prevention comes down to a flat subfloor, correctly engaged joints, staggering the end joins as the manufacturer recommends, and leaving the floor free to float. Planks with damaged click profiles should be set aside during installation rather than forced in.

Hollow, drummy or clicking sounds underfoot

Because hybrid floats over the slab rather than being glued to it, it naturally sounds a little different from tiles or glue-down vinyl. A light, even sound across the whole room is normal. A distinctly hollow or drummy patch, or a clicking or crackling noise in one area, usually means the plank is bridging a low spot in the subfloor and moving down and up as you step on it.

Clicking can also come from grit trapped under the floor, from the plank rubbing against a fixed object at its edge, or from an extra underlay that is softer than the manufacturer allows. Most hybrid planks already have an underlay attached, and adding a second soft layer underneath can let the joints flex too much, which leads to noise first and broken joints later.

The fix on a new floor is preparation: grinding high spots, filling low spots with levelling compound, vacuuming the slab thoroughly before the planks go down, and using only the underlay the manufacturer specifies. In apartments, the plank and underlay combination may also need to meet a body corporate acoustic rating, so it should be chosen to satisfy both the by-laws and the manufacturer.

Dips, bounce and broken click joints

Hybrid's rigid core lets it bridge very small imperfections, but it cannot bridge a genuine hollow in a slab. If a plank spans a dip, it flexes every time someone walks over it. Over months the click joint along that plank can crack, the plank may start to rock, and the joins on either side can open or peak.

Manufacturers publish a flatness tolerance in their installation instructions, typically expressed as the maximum gap allowed under a straight edge of a set length, for example a few millimetres over two or three metres. The exact figure varies between products, and installing outside it can affect the product warranty. That is why checking the floor with a straight edge at the measure, and pricing the preparation it needs, matters more than the brand of plank.

Moisture, cupping and damp slabs

Hybrid planks are waterproof, so they do not swell the way laminate does. That does not mean moisture can be ignored. A slab that is still drying, or one that draws moisture from the ground, can affect the underlay and the click joints over time, encourage mould under the floor, and in some products cause edges to cup or lift. Many manufacturers require a moisture barrier over concrete, and new slabs need time to dry before any floor is laid.

Surface water is a separate issue. Hybrid handles spills well, but water left to sit at the edges can run into the expansion gap and under the floor. Wipe up spills, keep mats at the back door and the pool entry, and make sure wet-area installations follow the manufacturer's guidelines. Our guide to waterproof flooring for laundries and wet areas covers where hybrid suits and where a different floor is the better choice.

Heat and sun in Gold Coast homes

Large north and west-facing windows, glass stacker doors and long summers put more heat into a floor than many people expect. Most hybrid products are rated for the temperatures found in normal living areas, but direct sun through glass can push the surface temperature of a dark plank far higher than the room air. Heat makes the floor expand, and the boards in the sunniest strip move more than the rest.

Sensible steps are to choose a lighter or mid-tone colour in very sunny rooms, use blinds or curtains during the hottest part of the afternoon, keep expansion gaps clear, and check the manufacturer's guidance on direct sunlight. In rooms that get extreme sun, a glue-down vinyl plank can be the more stable option, which we explain in our hybrid versus vinyl plank guide.

How subfloor preparation prevents most problems

Preparation is the part of a flooring job you never see once it is finished, and it is the part that decides whether the floor stays flat and quiet. On a concrete slab it usually means checking the whole area with a straight edge, grinding down ridges and high spots, filling dips and old tile-adhesive patches with levelling compound, removing old glue, nails and smooth edge, and vacuuming the slab clean.

Over existing tiles, the tiles need to be firmly bonded, and ceramic tiles get levelling compound first (a skim coat for hybrid, a flood coat for vinyl plank) so grout lines and lippage can't make the joints flex. Our guide to laying flooring over tiles explains when that works. Over timber subfloors in older homes, loose or springy boards need to be fixed down before a floating floor goes over them.

At Streatfield Flooring, removal of the old floor, subfloor preparation and levelling, trims and stairs are part of the fixed written quote, so the preparation your floor needs is priced before you commit rather than discovered on installation day.

Can a peaking or gapping floor be fixed?

It depends on the cause. A floor that is peaking because it is pinned can sometimes be relieved by trimming planks back from walls, door frames or cabinetry to restore the expansion gap, or by adding an expansion break at a doorway. Replacing a single damaged hybrid plank means lifting the floor from the nearest wall to that plank, which is one reason to keep a few spare planks from the original batch.

Where the problem is an uneven slab, the planks usually need to be lifted, the subfloor prepared properly and the floor relaid or replaced, because the joints that have been flexing may already be weakened. If you are replacing a floor that has failed, make sure the new quote includes the preparation that the old installation missed.

Questions to ask before you book a hybrid installation

A low price can hide the steps that prevent these problems. When you compare quotes, it is worth asking each installer the same questions:

• Will you check the subfloor with a straight edge, and is the preparation it needs included in the price?
• Is removal and disposal of the old floor included?
• What expansion gap and expansion breaks does this product need, and where will the breaks sit?
• How will the floor be finished at walls, doorways, tiles and sliding doors?
• Will kitchen islands or built-in furniture sit on the floor, or will the floor run around them?
• Which underlay will be used, and does it meet the manufacturer's requirements and any body corporate acoustic rules?
• Is the price fixed in writing, including trims and stairs?

What it costs to do it properly

As a general guide, hybrid flooring supplied and installed on the Gold Coast typically costs about $70 to $120 per square metre in 2026. Where a job sits in that range depends on the product, the size and shape of the area, how much levelling the slab needs and whether old flooring has to be removed. Our flooring cost guide explains the main price drivers.

Our mobile showroom brings hybrid samples to your home, and at the same free visit we measure every room and check the subfloor, so the preparation is priced into a fixed written quote. Our Price Beat Guarantee applies to written quotes from other licensed installers, and we cover the Gold Coast from Coomera to Tweed Heads.