How to Lay Floating Vinyl Plank Flooring
Click-lock vinyl plank is the easiest “real” flooring product in the Aussie market. Once you’re past the first row, an experienced flooring hand lays at 15 m²/hr — a 40 m² living room is half a day’s work. The catch is the first row sets up everything that follows. Get it wrong by 3 mm and by the time you reach the far wall you’ve got a wedge-shaped gap that you can’t fix without lifting the whole floor. The rule I learned from a tiler 20 years ago and apply to every job I do is this: snap a chalk line, don’t trust the wall. Aussie houses — especially anything pre-2000 — are not square. Walls bow, corners aren’t 90°, and an 8 m wall might be 30 mm out of straight along its length. Lay the first row tight against the wall and you’ve baked that bow into your floor permanently. The other Aussie gotcha that ruins more vinyl plank installs than any other: slab moisture. AS 1884 requires a moisture test before vinyl flooring goes down and half the installs I see have skipped it. Here’s the proper sequence.
What you’ll need
- Vinyl plank — 5 mm minimum thickness, hybrid SPC core for high-traffic (Karndean Korlok, Godfrey Hirst Liberty, Quick-Step Livyn) or 4 mm budget tier (Bunnings Senso)
- Underlay — 1.5 mm IXPE or 2 mm cork; sometimes pre-attached to plank
- A moisture meter (Tramex CMEX II — Bunnings rents them)
- A calcium chloride moisture test kit (for AS 1884 slab test) — about $40 from a flooring supplier
- A chalk line and an 8 m steel tape measure
- A Stanley knife with hook blades
- A mitre saw or jigsaw for end cuts
- A tapping block and pull bar ($20 each at Bunnings)
- A rubber mallet
- 10 mm spacers for the expansion gap
- A vacuum and damp mop for prep
- Selleys Wet Area silicone for any wet-area perimeter
Step 1: Acclimatise the planks for 48 hours minimum
Stack the boxes in the room where they’ll be laid, lying flat, not on edge. Open the boxes. Leave 48 hours minimum — 72 in summer or in an unheated room in winter. Adelaide Hills swings 18°C between 7am and 3pm in spring and the planks need to settle to room temperature before lock-up. Skip this step and the planks will expand or contract after install, giving you either gaps or buckling within months. This is the most boring rule on the box and the most ignored.
Step 2: Test the subfloor moisture — the AS 1884 step
For a slab: the calcium chloride test. Mark out a 600×600 mm area, tape a sealed cup of calcium chloride to the slab, leave 72 hours, weigh the difference. If emission is over 4 lbs/1000 sq ft/24 hours (the AS 1884 limit), you can’t lay vinyl plank without a moisture suppression treatment first. Quick screening check: Tramex moisture meter on the slab — over 4% on the relative scale means stop and do the calcium chloride test properly. Hill’s water down here is hard and the slabs in pre-2000 Adelaide Hills homes often have no membrane, so I see high readings constantly. The fix is a liquid-applied moisture barrier (Mapei Eco Prim PU 1K or Sika MoistureBlock) before underlay. Adds half a day and $200 to a 40 m² floor; saves $4,000 in rip-up-and-relay 18 months later.
Step 3: Check and prepare the subfloor for flatness
Subfloor must be flat (3 mm tolerance over 3 m), clean and dry. Sweep, then vacuum, then damp-mop. Any high spots get ground with a concrete grinder; any low spots get filled with self-levelling compound (Davco SLU or Mapei Ultraplan). For a timber subfloor: check for squeaks (screw down to the joists where they squeak), nail pops and rotten boards. The vinyl will telegraph any defect within a year — what feels like a tiny dip with bare feet becomes a visible valley once the plank goes over it.
Step 4: Plan the layout — measure both walls before you start
Measure the room width (perpendicular to the planks). Divide by the plank width (typically 178 mm). The result tells you how wide your last row will be. If that number is less than half a plank wide (89 mm), you need to rip the FIRST row narrower so the last row isn’t a sliver. Sliver-width last rows snap, look terrible, and won’t lock in. Plan to start narrow if needed. Twenty years on the tools and I still see DIYers skip this calculation; they get to the last row and panic. Do the maths first.
Step 5: Snap a chalk line, NOT the wall
This is the rule. Pick a “control wall” — the longest, straightest wall in the room. Measure 250 mm out from that wall at each end (250 mm = plank width 178 + 10 mm expansion + a working margin). Snap a chalk line between the two marks — that’s your guide line. The first row sits against the chalk line, not against the wall. The 10 mm expansion gap to the wall gets filled with spacers, and any wall bow gets absorbed by scribing the first row to match the wall curve. Tedious but straight floor at the end.
Step 6: Lay the first row, locking long-edge to long-edge
Underlay first if not pre-attached — roll out, butt the seams, tape with the supplied seam tape. Don’t overlap, butt only. First plank: tongue-side facing the chalk line. Push spacers between the plank and the wall (not between the plank and the chalk line — the chalk line is interior). Lock the second plank end-to-end with the first; push the long-edge tongue down and engage. Continue along the row. End cuts: measure, mark, score with the Stanley knife (deep score, both sides), snap. Or jigsaw for curves around door jambs.
Step 7: Stagger the joints — 300 mm minimum
Aussie click-lock standard is 300 mm minimum stagger between end joints in adjacent rows. Joints aligned within 300 mm fail over time because the load isn’t being spread. Most plank brands have a stagger pattern on the box; follow it. The cut-off from row 1’s last plank starts row 2 if it’s over 300 mm; otherwise discard.
Step 8: Tap and pull-bar at every joint
The tapping block goes against the long edge or end edge of a freshly-locked plank, and you give it a few raps with the rubber mallet to seat the joint. The pull bar hooks over the far end when you’re working into a wall and can’t tap from the open side. Both tools are $20 at Bunnings; a vinyl plank install without them takes three times as long and the joints look loose forever. I’ve seen tradies skip the tapping block “to save time” and the floor lasts a quarter as long.
Step 9: Fit doorways and tricky cuts
Door jambs: undercut the jamb with a flush-cut saw or pull-saw so the plank slides under, rather than cutting the plank around the jamb. Looks 100x better and hides any cut imperfections. Around a toilet (vinyl in wet areas needs a perimeter silicone seal): template the toilet base on cardboard, transfer to the plank, jigsaw the curve. Silicone the perimeter with neutral-cure, sanitary-grade silicone — see how to re-silicone a bathroom properly for the bead technique.
Step 10: Last row, perimeter seal, and aftercare
Last row is almost always a rip cut. Measure the gap from the second-to-last row to the wall, subtract 10 mm for expansion, rip the plank with a hook-blade knife and steel ruler. Lock the last row in with the pull bar — no room for the tapping block this close to the wall. Pull the spacers, fit skirting or scotia trim to cover the gap. If the floor runs into a wet area, run a 5 mm bead of Selleys Wet Area along the perimeter — vinyl plank isn’t a waterproof system on its own, but a siliconed perimeter on a properly waterproofed substrate gives you a sealed floor under AS 3740. Tell the household: no steam mops, no eucalyptus or solvent cleaners, felt pads under all furniture legs. Bona pH-neutral floor cleaner is the right product. See painting trim and skirting boards for the skirting side.
When to call a tradie
Lay-up itself is squarely a homeowner job for anyone with basic tools and patience. Call a tradie when you’ve got a slab moisture reading over the AS 1884 limit and you’re not confident applying a liquid moisture barrier — getting that wrong is the most expensive vinyl install mistake possible. Also call a waterproofer if the floor runs into a real wet area and you’re seeing any sign of membrane failure (existing tiles cracking near the bath, soft spots in the underlying substrate) — anything that breaks the waterproof membrane on a real bathroom is licensed work under AS 3740. And if you’ve got a sloping timber subfloor with bouncy joists, a carpenter needs to look at the substructure before any floor goes down.
Common screw-ups
- Skipping the calcium chloride moisture test — vinyl lifts in 18 months, $4,000 redo.
- Laying tight against a bowed wall — wedge-shaped gap by the time you reach the far side.
- Not acclimatising the planks — gaps or buckling within months.
- Sliver-width last row because the layout wasn’t calculated upfront — looks awful, won’t lock.
- Using a steam mop on day one — voids the warranty on most brands and lifts the joints.
Cost & time
SPC vinyl plank: $40–$80/m² supplied for mid-range; cheaper Bunnings tier $25–$35. Underlay: $5–$8/m². Tools (tapping block, pull bar, spacers, hook blades): $60. Calcium chloride test kit: $40. Total DIY supply for a 40 m² living room: $1,500–$3,500 depending on plank quality. A trade install is $30–$50/m² labour on top. Time: a full Saturday for a confident DIYer on a 40 m² rectangular room, two Saturdays if it’s L-shaped with door jambs and a wet-area perimeter.
Moisture test, chalk line, scribe first row. AS 1884 moisture test means the floor lasts 15 years instead of 18 months. Chalk line means the floor is straight even if the wall isn’t. Scribed first row means the wall-line gap looks intentional rather than a mistake. Skip any one of those and the floor will tell on you within a year. Twenty years on the tools and I still see the same three corners being cut on every second job. The customers who insist on the AS 1884 test are the ones who never call me back about lifted joints. Do it once, do it properly, and the floor outlasts the kitchen renovation.
