Yes — you can lay vinyl plank or sheet vinyl directly over existing timber floorboards, provided the boards are sound, flat and dry. The job lives or dies on the prep work, not the vinyl itself. This guide covers what to check before you start, when you need a plywood overlay, and the mistakes we see most often when homeowners skip steps.

When laying vinyl over floorboards works

It works when the existing timber floor is structurally sound, level within tolerance, and free of moisture issues. That usually means a tongue-and-groove hardwood floor in a typical Australian home that’s been down for a few years and has settled. If your boards tick the boxes below, vinyl will lay well over the top:

• No active squeaks, springiness or loose boards
• No cupping, crowning or rot — particularly near wet areas
• Flat to within roughly 3 mm over a 2 m span
• No visible gaps wider than 5 mm between boards
• Subfloor moisture content stable and within the manufacturer’s spec

When it doesn’t work — and what to do instead

If the boards are bouncy, badly cupped, or showing damp stains, laying vinyl straight over them just hides the problem. The vinyl will telegraph every imperfection: a high spot will eventually wear through the wear layer, a cupped board will show as a ridge, and a squeak doesn’t go away just because there’s vinyl on top. In those cases you have two paths — lift the boards and start fresh, or sheet over them with plywood (covered below).

If you’re laying onto a concrete slab rather than timber, the prep is different — see our guide to laying vinyl on a concrete floor.

Prep work, step by step

1. Inspect every board

Walk the room slowly. Mark any squeaks, soft spots or boards that move under load. Re-fix loose boards with screws into the joists below — not nails, which work loose again. Replace any rotten or termite-affected boards before you go any further.

2. Flatten the surface

Use a long straightedge — a 2 m aluminium level works — to find high and low spots. Sand or plane any high points, fill gaps and dips with a flexible floor patch designed for timber subfloors. For wider sheet vinyl, you’ll want the surface flatter than you think; even a 2 mm bump will show through over time.

3. Sheet over with plywood if needed

If the boards are wide, gappy, or just too uneven to skim flat, the cleanest fix is a 6 mm or 9 mm structural plywood overlay screwed down on a tight grid. This gives you a continuous, smooth surface and isolates the vinyl from any future board movement. We’d recommend this whenever the existing floorboards are over 100 mm wide or have visible gaps.

4. Acclimatise the vinyl

Bring the cartons into the room they’re being laid in and leave them flat for at least 48 hours. Vinyl expands and contracts with temperature, and an under-acclimatised plank is the single most common cause of click-joint failures we see on call-backs.

Underlay: do you need it?

It depends on the vinyl. Many SPC and rigid-core planks come with a pre-attached IXPE acoustic underlay, in which case you don’t add another layer — doubling up will void the warranty and let the click joints flex apart. For sheet vinyl or a glue-down plank without backing, a thin underlay or moisture barrier may be required. We’ve broken the options down in the underlay for vinyl flooring guide.

Click-lock vs glue-down over floorboards

Most modern vinyl plank uses a click-lock system — usually a 5G or 2G click profile — and floats over the subfloor without adhesive. That’s the easier path over timber floorboards because it tolerates minor seasonal movement in the boards underneath. If you want to understand the click profiles before you buy, the 5G and 2G click systems explainer covers both.

Glue-down vinyl can also work over a plywood overlay, but it’s unforgiving — the adhesive locks the vinyl to the subfloor permanently, so any movement in the timber below will eventually transfer up. We’d only glue-down over floorboards that have been sheeted over with plywood first.

Expansion gaps and finishing

Float-laid vinyl needs an expansion gap of around 8-10 mm at every wall, doorframe and fixed cabinet. Skipping this is the second most common cause of buckling we see — the floor has nowhere to go when it expands and pushes up at the weakest joint. The expansion gap for loose lay vinyl guide covers the detail. Cover the gap with skirting or scotia, not silicone — the gap needs to stay open.

The short answer

Laying vinyl over floorboards is straightforward when the timber subfloor is sound, flat and dry. Re-fix anything loose, flatten anything uneven, sheet over wide or gappy boards with plywood, acclimatise the vinyl for 48 hours, and leave a proper expansion gap. If you’re not sure whether your existing floor is up to it, drop into our Sydney or Brisbane showroom with a few photos — we’ll tell you honestly whether it’s a lay-over job or whether the boards need to come up first.

What to verify before you buy