How flat does the subfloor need to be for vinyl flooring?

The common standard for resilient flooring is a variation of no more than about 3 mm under a 2 metre straightedge. Anything worse and you get flexing underfoot, hollow sounds, stressed click joints on rigid planks, and visible dips in raking light. High spots are ground down and low spots filled with a self-levelling compound before laying begins. Thin vinyl is less forgiving than thick SPC, because it follows the contour of whatever is beneath it.

When can I move furniture back after flooring installation?

For click-lock floors you can usually walk on them immediately and move furniture back after about 24 hours. For glue-down vinyl and LVT, allow the adhesive to set as specified before heavy loads go on, typically 24 to 48 hours, and avoid wet mopping for at least 48 hours so moisture does not reach the curing adhesive. Always lift furniture into place rather than dragging it, and fit felt pads before the legs touch the new floor.

Flooring Guide

Vinyl, SPC & Laminate Flooring Installation in India: Subfloor Prep, Process & What to Check

Almost no resilient floor fails because of the flooring. It fails because of what was underneath it, or because someone skipped a day of preparation to finish quicker.

By FloorWallDecor Editorial | Updated August 2026 | 10 min read

A good vinyl or SPC floor is roughly 30% product and 70% preparation. The buckled floor, the hollow patch that clicks underfoot, the joints that opened up in the first summer - in nearly every case the flooring was fine and the subfloor, the acclimatisation or the expansion gap was not. This guide covers what should happen before, during and after installation, so you can tell whether the job in front of you is being done properly. It is written for Indian conditions: tile subfloors, monsoon humidity and ground-floor slabs.

1. The Subfloor Decides Everything

Before any flooring is opened, the surface underneath has to pass four tests. If it fails any of them, laying over it just transfers the problem to your new floor:

Requirement	The Standard	What Happens If Ignored
Flat	Within about 3 mm under a 2 m straightedge	Flexing underfoot, hollow sounds, stressed click joints, visible dips in side light
Dry	No residual moisture in the slab or screed	Adhesive fails, planks cup, mould grows underneath where you cannot see it
Clean	No dust, grease, paint blobs or debris	Adhesive does not bond; grit telegraphs through as bumps
Sound	No loose tiles, crumbling screed or hollow sections	Whatever moves below will crack or separate the floor above

Thin vinyl is the least forgiving, because it follows the contour of whatever is beneath it - a 2 mm ridge stays visible forever. Rigid SPC bridges small imperfections better, but its click joints take the strain instead, and joints under permanent stress eventually separate.

2. The Moisture Check Nobody Should Skip

The 24 to 48 hour plastic sheet test

Tape a 1 ft square of clear plastic sheet to the subfloor, sealing all four edges completely.
Leave it for 24 to 48 hours.
Lift it. Condensation on the underside, or a darker patch on the slab, means residual moisture is still coming up.
If it comes up wet, find out why before laying anything. A new screed simply needs more curing time; a ground-floor slab or a persistently damp patch needs a moisture barrier or an actual repair.

A moisture meter gives a faster reading, but the plastic test costs nothing and catches the obvious cases. If the damp is coming from a wall rather than the floor, see our guide to damp walls and seepage first.

3. Laying Over Existing Tiles

This is the most common scenario in Indian renovations, and the good news is that it usually works - avoiding the dust, debris and week of chaos that comes with breaking tiles out.

You can lay over tiles when

Every tile is firmly bonded — tap around and listen for hollow spots
The surface is reasonably level with no lipping between tiles
The slab below is dry
Grout lines are filled first, so they do not telegraph through
The extra floor height still clears doors, wardrobes and thresholds

Remove the tiles when

Tiles sound hollow, are cracked, or lift when tapped
There is damp coming through the slab
Level differences between tiles exceed what a compound can reasonably fix
Door clearance cannot accommodate the added height
The tiled surface is heavily sloped, as in a converted balcony or bathroom

Check the doors before you commit. Flooring plus underlay adds height. Internal doors can usually be trimmed, but a main door, a wardrobe shutter that opens outward, or a bathroom threshold with a level difference are all easier to solve on paper than after the floor is down.

4. Acclimatisation: The Step Most Often Skipped

Flooring expands and contracts with temperature and humidity. If it is laid before it has settled at room conditions, it will move afterwards - and afterwards it is trapped between four walls.

Leave sealed boxes flat in the actual room of installation for 24 to 48 hours
Do not stand boxes on edge — planks bow
Do not acclimatise on a balcony, in a garage or in a stairwell; the point is the room's own conditions
Keep the room roughly at the temperature it will normally be lived in

Two failure modes follow from skipping it. Flooring laid straight off a hot delivery truck contracts once inside, opening visible gaps at the joints. Flooring brought from an air-conditioned warehouse into a warm room expands, presses against the walls and lifts. Both look like product defects and neither is.

5. Expansion Gaps: Why the Floor Must Be Allowed to Move

Click-lock floors are floating floors - they are not fixed to the subfloor, and they must be free to move as a single sheet. That requires a gap of roughly 8 to 10 mm around the entire perimeter and around every fixed object: pillars, pipes, door frames, the base of a staircase. The gap is then hidden under skirting or beading.

Expansion gap mistakes that buckle a floor

No perimeter gap at all, or a gap left on only two sides of the room
Skirting or beading nailed through the flooring, pinning it in place
Heavy fixed furniture — a full-height wardrobe or kitchen unit — sitting directly on the floating floor and trapping it
Forgetting the gap around pillars, pipe boxings and door frames
Running one continuous sheet through a doorway into another room, with no transition profile, on a long run

Rule of thumb: beading and skirting fix to the wall, never to the floor. If a nail or screw goes through the plank, the floor is no longer floating and the expansion gap has been wasted.

6. Underlay and Moisture Barrier — Two Different Things

These get conflated constantly, and getting it wrong is either a waste of money or a failed floor:

Layer	What It Does	When You Need It
Moisture barrier	Stops vapour rising out of a concrete slab into the floor	Over concrete, and on ground floors — required even if the plank has a pre-attached pad
Underlay / foam pad	Comfort, minor sound damping, small imperfection tolerance	Only where the flooring does not already have a pad attached
Both together	Barrier below, pad above	Ground floor with unpadded planks
Double underlay	Nothing good	Never — excess softness flexes click joints until they fail

7. What Actually Happens on Installation Day

Room clearance and inspection

The room is emptied, the subfloor is swept and inspected, and any last high spots are ground off. This is the last moment to catch a problem cheaply.
Barrier and underlay

Moisture barrier laid and taped where required, underlay rolled out where the product needs it.
Setting out

The layout is planned from the longest straight wall, with joints staggered and the first row measured so the final row is not a sliver. Good setting out is what makes a floor look professionally done.
Laying

Planks clicked or glued in sequence, spacers holding the perimeter gap, cuts made around door frames and pipes. A typical team covers a few hundred square feet of click-lock in a day once the room is clear.
Skirting, beading and transitions

The expansion gap is covered, and transition profiles are fitted at doorways and where the new floor meets a different surface.
Clean and handover

Dry clean, walk the floor for lifted edges or gaps, and hand over spare planks.

Schedule reality: the laying is the fast part. Acclimatisation adds 1–2 days before work can start, and any self-levelling compound must cure fully first, which can add several more. A single room over a sound subfloor is often a one-day job; a whole flat needing levelling is a multi-day project. Anyone promising a levelled-and-laid flat in a day is skipping something.

8. Prepare Your Home Before the Team Arrives

Your side of the job

Empty the room completely, including wardrobes if they must be moved
Dismantle beds and large furniture in advance — teams charge time for this, or cannot do it at all
Take down curtains and blinds near the floor line
Confirm working power points in or near the room for cutting tools
Arrange building permission, lift access and parking, especially in a society
Decide the skirting or beading finish beforehand, not on the day
Keep pets and small children out of the work area — cutting produces sharp offcuts
Ask for the spare planks in writing as part of the order

9. Red Flags: Stop the Job If You See These

Any one of these is worth a conversation before work continues

No moisture check of any kind on a ground floor or new screed
Boxes delivered and opened the same morning, with no acclimatisation
No spacers visible at the walls as the first rows go down
Laying straight over hollow-sounding or cracked tiles
Skirting being nailed through the flooring
A second underlay added under planks that already have a pad
Being told an expansion gap is "not needed in this brand" — ask to see it in the manufacturer's instructions
Levelling compound laid in the morning and flooring laid on it the same afternoon

10. After Installation

Click-lock: walk on it immediately; move furniture back after about 24 hours
Glue-down vinyl and LVT: let the adhesive set as specified, typically 24 to 48 hours, before heavy loads
No wet mopping for at least 48 hours, so moisture does not reach curing adhesive
Fit felt pads before furniture legs touch the floor, and lift rather than drag
Store your spare planks flat and indoors — batch colours shift between production runs, so a plank bought later rarely matches

From there it is routine care, which we cover in detail in how to clean and maintain vinyl, SPC and PVC flooring.

Our Recommendation

Judge a flooring quote by what it says about preparation, not just the rate per square foot. A quote that mentions subfloor inspection, levelling where required, acclimatisation time and expansion gaps is from someone who intends to do it properly. A quote that is only a number and a date is cheaper for a reason, and the difference shows up in the first hot season - by which point the flooring will be blamed, not the installation. If you are still choosing the product itself, start with SPC vs vinyl flooring and waterproof flooring options.

Frequently Asked Questions

Can vinyl or SPC flooring be installed over existing tiles? ▾

Usually yes, and it is a major reason people choose resilient flooring for renovations. The tiles must be firmly bonded with no hollow sections, reasonably level and dry, and grout lines generally need filling first so the pattern does not telegraph through thinner vinyl. Tiles that are loose, cracked or sitting over a damp slab should be removed rather than covered.

What is the expansion gap for SPC and vinyl flooring? ▾

Typically about 8 to 10 mm around the entire room perimeter and around every fixed object - pillars, pipes, door frames - then hidden under skirting or beading. The gap lets the floating floor expand and contract with temperature and humidity. Without it the floor has nowhere to go and buckles, usually in the first hot season. Check your specific manufacturer's figure, as some require more on long runs.

How flat does the subfloor need to be? ▾

The common standard is a variation of no more than about 3 mm under a 2 metre straightedge. Beyond that you get flexing, hollow sounds, stressed click joints and dips visible in raking light. High spots are ground down and low spots filled with self-levelling compound before laying. Thin vinyl is far less forgiving than rigid SPC because it follows the contour beneath it.

How long does it take to install vinyl or SPC flooring? ▾

Laying is fast - a typical team covers a few hundred square feet of click-lock per day once the room is clear. The schedule is set by preparation: 24 to 48 hours of acclimatisation before laying, plus full curing time for any levelling compound. One room over a sound subfloor is often a one-day job; a flat needing levelling is a multi-day project.

Does vinyl flooring need to be acclimatised before installation? ▾

Yes. Sealed boxes should sit flat in the actual installation room for 24 to 48 hours so the material stabilises at the temperature and humidity it will live in. Flooring laid straight off a hot truck contracts afterwards and opens gaps at the joints; material from an air-conditioned store expands in a warm room and presses against the walls. Stack boxes flat, never on edge, and never on an open balcony.

Do I need an underlay under SPC flooring? ▾

It depends on the product. Many SPC planks have a pre-attached IXPE or EVA pad, and adding a second underlay on top of that is wrong - the extra softness flexes the click joints until they fail. Where there is no pre-attached pad, a thin underlay adds comfort and sound damping. A moisture barrier is a separate requirement over concrete or on ground floors, and it applies whether or not the plank has a pad.

When can I move furniture back after installation? ▾

Click-lock floors can be walked on immediately and take furniture after about 24 hours. Glue-down vinyl and LVT need the adhesive to set first, typically 24 to 48 hours, and no wet mopping for at least 48 hours so moisture does not reach curing adhesive. Always lift furniture into position rather than dragging it, and fit felt pads before the legs touch the new floor.

Planning a Floor? Start With the Subfloor

Free on-site assessment across Delhi NCR — we check flatness, moisture and door clearances, and tell you upfront whether levelling is needed before we quote a single square foot.

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Flatness tolerances, expansion gaps, acclimatisation periods and curing times above reflect standard practice for resilient flooring and vary between manufacturers. Where your flooring came with installation instructions or warranty conditions, those take precedence. Subfloor moisture problems should be diagnosed on site before any floor is laid.