DIY vs Pro
How to Install Vinyl Plank Flooring on a Slab
June 3, 2026 9 min read By Fort Worth Flooring Co
Laying rigid-core plank is one of the more achievable flooring jobs for a competent DIYer, and most of the guides written about it start at the wrong place. The clicking together is easy. What happens before it is what decides whether the floor is still tight in three years.
Before anything: check the slab
Flatness. Get a ten foot straightedge — a good level or a straight length of aluminium — and lay it across the floor in several directions, including diagonally. Measure the largest gap underneath it.
Most manufacturers specify around three sixteenths of an inch over ten feet. Check yours, because it is their tolerance and their warranty.
If you are outside it, grinding high spots and filling low ones is the fix. Wide planks are considerably less forgiving than narrow ones here, because a long board bridges a dip instead of following it and then flexes at the joint under every footstep. That flex is what eventually separates a seam.
In this county a lot of the 1960s and 1970s slabs — Haltom City, Watauga, older Arlington and Bedford — have settled slightly dished. Almost every hollow-sounding plank floor we are called out to is a substrate nobody measured.
Moisture. If you are floating the floor, this is much less critical. If you are gluing it, it is the whole job: concrete drives vapour upward year round and that vapour breaks the adhesive bond, producing an intact floor that has come loose from the slab.
Floating is the more forgiving route and it is what we would recommend for a first-time installer over a slab.
Post-tension cables. If the house was built from roughly the early 1980s onward in Tarrant County, the slab is probably post-tension. Do not drill, anchor or fasten anything into it — for thresholds, for trim, for anything — without knowing where the tendons are. They are under enormous load. This is a safety point rather than a flooring one.
Tear-out
Priced and planned by what is bonded to the slab, not by area.
Stretch-in carpet lifts easily. Thinset tile means chipping tile and grinding residue. Glued-down carpet leaves adhesive that has to come off.
One serious caution: pre-1980s sheet vinyl. Some backings from that era contained asbestos. If you are in a house of that age and there is old sheet flooring under what you are removing, that is a testing question before it is a demolition question, and it is not a DIY step.
Acclimation and layout
Bring the material into the room it will live in and leave it there for the period the manufacturer specifies. Not the garage, not the van.
Then dry-lay two rows and look at them in daylight before committing. Direction usually runs parallel to the longest wall or to the main light. In an open plan, set the direction once for the whole floor plate — deciding room by room produces a house that reads as several floors.
Plan so the last row is not a sliver. Measure the room width, divide by the plank width, and if the remainder is under about two inches, cut the first row narrower to balance it.
Expansion gap: the thing that gets skipped
A floating floor has to move. It needs a gap at every fixed edge, and “every fixed edge” means walls, doorways, cabinet toe kicks, pipe penetrations and the bottom of stairs — not just the perimeter of the room.
Spacers along every wall, and check them again as you go, because they migrate.
Do not screw a threshold or transition strip through the boards into the slab. That creates a fixed point in a floor designed to move as one piece, and it is one of the two most common causes of a buckled floor in this climate.
Underlayment
If the planks have a pad attached, do not add a second one. More cushion than the click joint was engineered for lets the joints work loose.
What you may still need over a slab is a vapour retarder. Check whether the attached pad is rated for concrete; a good number are not, and if it is not, the sheet goes down first.
Cuts and details
Score and snap works for straight cuts across the plank. A jigsaw or a multi-tool handles pipes and irregular shapes.
Undercut door casings and lay the plank beneath them rather than cutting the plank around them. It takes an extra ten minutes per door and it is the single biggest visual difference between a professional-looking floor and an obviously amateur one.
When to hand it over
Be honest with yourself about four things: a slab needing a levelling pour, a glue-down assembly, old sheet vinyl in a pre-1980s house, and a floor with many doorways and transitions.
None of those is about the laying. They are about the preparation and the detailing, which is where the cost and the risk actually sit — and where a floor that lasts diverges from one that does not.