Almost every Florida house sits on a concrete slab, and two things decide whether your new floor lasts: how much moisture is moving up through that slab, and how flat it is. The rule we work by is simple — nothing gets glued or clicked down until the slab passes the moisture test in the flooring manufacturer's own instructions and meets their flatness requirement.
Why a slab-on-grade floor behaves differently than a wood subfloor
A slab sits directly on the ground. Concrete is porous, and ground moisture moves up through it as vapor all day, every day. In a dry climate that barely matters. In Florida, with a high water table, heavy summer rain and air conditioning running most of the year, it matters constantly.
Newer homes have a vapor retarder — a plastic sheet under the slab — that slows that movement down. Older homes often don't, or it was punctured during construction. You can't tell by looking. A slab can be bone dry on the surface and still be pushing vapor through it.
This is why a floor can look perfect the day it's finished and fail ten months later. Glue softens and planks shift. Laminate edges swell. Tile sounds hollow underfoot. Homeowners blame the product, but in most cases the product was fine and the slab was never tested.
What moisture testing actually does before anything goes down
Moisture testing tells you how much vapor the slab is giving off, so you know whether the floor you picked can be installed on it as-is, or whether it needs a moisture mitigation coating or a different underlayment first. The common methods are a relative humidity probe set into holes drilled in the slab and a surface calcium chloride test.
Here's the part people miss: there is no single industry number to pass. The acceptable limit comes from the flooring manufacturer's own installation instructions for the exact product you bought. Different vinyl plank lines, different adhesives and different tile setting systems all publish different limits, and installing outside those limits usually voids the warranty.
So before we price anything, we want to know the product. Then we read that manufacturer's installation guide, test to what it asks for, and tell you the result in writing. If the slab doesn't pass, you get options — mitigation, a different product, or a different method — not a shrug.
Flatness and leveling: the problem you feel with your feet
Slabs are poured flat, not perfectly flat. Over decades they settle, crack slightly, and pick up high spots where finishers overworked the surface. You usually notice it as a rocking appliance or a doorway that doesn't sit right.
Low spots are filled with self-leveling compound, a pourable cement product that finds its own level. High spots are ground down with a diamond grinder. Both are messy, dusty, normal parts of the job, and both take drying or curing time before the floor goes on top.
Skipping this is what ruins click-lock LVP. The planks lock edge to edge and span the dip, so the floor flexes every time you walk over it. That flexing works the joints apart until you get gaps, clicking noises or separated seams. Glue-down vinyl telegraphs the dip instead and shows a visible wave. Large-format porcelain tile is the least forgiving of all — an unlevel base gives you lippage between tiles and cracked grout lines.
Taking out what's there now
Carpet is the easiest removal: carpet, pad, staples and tack strip come up, and the slab underneath is usually in decent shape. Old adhesive from glue-down carpet or vinyl has to be scraped and, if it's stubborn, ground off, because new adhesive won't bond to old.
Old tile is the bigger job. The tile comes up, but the thinset bonded to the slab comes with it only in pieces. That bed has to be ground flat or the new floor inherits every ridge. Plan for dust containment, more labor hours and more debris hauling than a carpet tear-out.
We handle carpet removal and replacement, demo, and subfloor prep and leveling as part of our flooring work, so one crew owns the slab from tear-out to final transition. That matters when a surprise shows up mid-demo — nobody has to stop and call a second contractor.
LVP or porcelain tile on a slab — which is the easier call
Both work on a slab. They just ask for different things. Luxury vinyl plank is a floating or glue-down system that needs an expansion gap at every wall and vertical surface, hidden later by baseboard or quarter round. It is quieter, warmer underfoot, faster to install, and more tolerant of a slightly imperfect slab than large tile is.
Porcelain and ceramic tile, including wood-look plank tile, bond directly to the slab and are the stronger choice in wet areas and for anything that opens to a pool deck or patio. They demand a flatter base and a proper movement joint layout, especially in long open runs.
If you're still deciding on a material rather than a method, our post on the best flooring options for Florida homes covers that comparison in more depth. This page is about what happens under whichever one you pick.
The finish details most quotes leave out
The flooring itself is the easy part to price. The details around the edges are where installs go wrong. Baseboards either come off and go back on, or get replaced — tell us which, because new baseboard and new paint change the number. Quarter round against existing base is the cheaper route and it looks it in some rooms.
Transitions between rooms, at thresholds, and at exterior doors need the right profile and the right height. Where new flooring meets an existing floor of a different thickness, you need a reducer, not a hope. Door bottoms sometimes need to be trimmed if the new floor is taller than the old one.
Carlos Garcia has completed more than 250 remodeling and construction projects, and these edge details are the ones homeowners end up looking at every day. We handle baseboards, trim and transitions as part of the job rather than as an afterthought.
What a complete flooring estimate should itemize
To compare two quotes fairly, they need to cover the same work. Ours is free and broken out so you can see what's included: demo and disposal of the existing floor, moisture testing, any required mitigation, floor prep (grinding and self-leveling compound by area), the flooring material and square footage with waste factor, adhesive or underlayment, baseboards or quarter round, thresholds and transitions, and cleanup.
If a quote is a single number with no line for prep, ask what happens if the slab tests wet or reads out of flat. A bid that assumes a perfect slab is not cheaper — it's unfinished, and the difference shows up as a change order halfway through.
Costs depend on size, material, how much prep the slab needs and whether layout changes are involved, so every project is quoted on site. Call (386) 251-9778 or request a free estimate and we'll measure, test and put it in writing.