Flooring · Lawndale, CA

Putting New Flooring Over a Concrete Slab in Lawndale

Most Lawndale houses sit on a concrete slab, and the slab decides which floors are safe to install. Here is what to test, what to fix first, and how to compare quotes from independent flooring specialists.

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Flooring in Lawndale

Pricing & What to Expect

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Service LevelCost Range
Slab moisture testing, per test location (typical range)$50 - $200
Grinding and prep of slab (typical range)$1 - $3 /sq ft
Self-levelling compound, materials and labour (typical range)$2 - $6 /sq ft
Rigid-core luxury vinyl plank, supply and install (typical range)$5 - $10 /sq ft
Porcelain tile, supply and install (typical range)$9 - $20 /sq ft
Engineered wood over slab, supply and install (typical range)$8 - $16 /sq ft
Plywood subfloor built over slab (typical range)$3 - $7 /sq ft
Crack-isolation membrane under tile (typical range)$1.50 - $4 /sq ft
Services & Details

Flooring Services in Lawndale

The slab is the job

In a slab-on-grade house the concrete is not just the surface you are covering, it is the variable that decides what you can put down. Concrete holds and moves moisture from the ground beneath it, and most flooring failures over slabs are moisture failures rather than product failures. Older slabs frequently have no vapour retarder underneath, or one that was punctured during construction. Every serious flooring contractor starts here, and a quote that never mentions the slab is a quote for a different house.

Testing is cheap; guessing is not

There are two standard tests. A calcium chloride test measures how much moisture comes out of the surface over a set period, and an in-situ relative humidity probe reads conditions inside a hole drilled into the slab, which is the more reliable of the two. Manufacturers publish a maximum figure for their product and will deny a warranty claim without test results. Ask whether testing is included in the quote and who pays for it, because it is often listed separately or quietly skipped.

Flatness, and why it is not the same as level

A slab can be perfectly level and still be unacceptably wavy, and it is the waves that cause problems. A floating floor over a dished slab flexes, the locking joints work loose, and you get a hollow crunch underfoot that no amount of adjustment fixes. Tile over the same slab gives you lippage at the edges and cracked grout. The fix is grinding the high spots and filling the low ones with a cementitious self-levelling compound, and it should appear as a line item rather than as a surprise on day two.

What goes over a slab well

Rigid-core luxury vinyl plank, porcelain tile and properly specified engineered wood all work over concrete when the moisture numbers are within range. Sheet vinyl and polished concrete are also worth pricing. What does not belong directly on a slab is solid hardwood, which moves too much with moisture and has nothing to fasten to; if you want real solid wood over concrete it needs a plywood subfloor built on top, which adds cost and raises the floor height enough to affect doors and thresholds.

Cracks, and telling the harmless from the serious

Fine shrinkage cracks are normal in a slab and are usually handled with a crack-isolation membrane under tile, or simply covered by a floating floor. Cracks where one side sits higher than the other, or that have widened noticeably over time, are a different matter and should be looked at before anyone buys materials. The reason tile matters here is that tile is rigid and telegraphs slab movement straight through to the surface. Ask what the contractor proposes to do about each crack rather than accepting a general reassurance.

Comparing quotes without comparing different jobs

Slab work is where flooring bids diverge most, because preparation is the part people leave out to look cheaper. Ask every contractor to itemise moisture testing, grinding, self-levelling compound, the moisture barrier or underlayment being used and by name, transitions at doorways, and disposal. A bid with preparation as an open allowance is not comparable to one with a fixed price. Tegula Stone connects Lawndale homeowners with independent flooring specialists; the work and the contract are between you and the contractor you choose.

FAQ

Flooring in Lawndale — Questions Answered

How do I know if my slab has a moisture problem? +
Sometimes you can see it, but often you cannot, which is exactly why testing exists. Visible signs include a white powdery deposit on bare concrete, which is mineral salt left behind as water evaporates through the slab; dark damp patches that come and go with the weather; old vinyl tile that has curled at the corners or lost its adhesive; and a musty smell in a closed room. A quick informal check is to tape a square of clear plastic sheet tightly to the bare slab and leave it for a day or two: condensation underneath or a darkened patch of concrete means moisture is moving. That test tells you there is a problem but not how big it is, so it is a reason to do a proper calcium chloride or relative-humidity test, not a substitute for one. A slab can also pass in one room and fail in another, so testing should cover the whole area.
Can I put solid hardwood over a concrete slab? +
Not directly. Solid wood expands and contracts with moisture much more than engineered board does, and a slab is a continuous moisture source, so a solid floor glued or fastened straight to concrete will cup, gap or buckle. There is also nowhere to nail. The route that does work is building a plywood subfloor on top of the slab, over a vapour retarder, and fastening the hardwood to that. It works well and it is what people do when nothing else will satisfy them, but be clear about the consequences before committing: it adds material and labour cost, and it raises the finished floor by roughly an inch and a half, which means doors need trimming, thresholds to other rooms need rethinking, and any appliance that slides under a counter may no longer fit. Engineered wood with a thick wear layer over a proper moisture barrier gives you a real wood surface without any of that.
Is luxury vinyl plank a good choice over a slab? +
It is one of the better ones, and it is popular in slab-on-grade houses for good reasons. It tolerates moisture far better than wood, most rigid-core products float rather than being glued so the slab does not have to be perfect, and it handles kitchens and bathrooms without special treatment. Two cautions. First, floating floors are unforgiving about flatness: the manufacturer will publish a tolerance, and if the slab is outside it the floor will feel hollow and the joints will eventually separate, so do not let anyone skip the levelling to hit a price. Second, the category covers a very wide quality range. The things that actually differ are the thickness of the wear layer on top, which determines how long it looks new, and the rigidity of the core. Ask for the specific product name and wear-layer thickness in the quote rather than accepting the words luxury vinyl.
What is a moisture barrier and do I need one? +
It is a layer between the slab and the flooring that slows water vapour from reaching the floor covering. It can be a sheet membrane rolled out, a liquid coating applied to the slab, or a barrier built into the underlayment of a floating floor. Which one you need depends on the test results and on what the flooring manufacturer requires, and those two things together decide it rather than a general rule. What matters practically is that the barrier is specified by name in the quote and that it is compatible with both the flooring and the adhesive, if adhesive is being used. A mismatch here is a warranty problem later. Also be aware that a barrier is not a licence to ignore a serious moisture reading: if the slab is genuinely wet, the source usually needs addressing, whether that is exterior drainage, a sprinkler line running against the foundation, or a plumbing leak.
The contractor wants to charge for self-levelling compound. Is that normal? +
Yes, and it is one of the most common causes of a price difference between two quotes for the same room. Slabs are poured to a construction tolerance, not a flooring tolerance, and decades of settlement do not improve them. Self-levelling compound is a cementitious material poured over the prepared slab that flows out flat and cures hard, and it is often the difference between a floor that feels solid and one that does not. What you want to avoid is an open-ended allowance, because that is a blank cheque. Ask the contractor to measure the slab with a straightedge or a laser, tell you how many bags they expect to use and over what area, and give a fixed price with a stated limit beyond which they will come back to you before proceeding. A contractor who has actually measured can do this; one who has not will resist.
Do I have to move out while the floor is installed? +
Usually not, but you should expect the working area to be unusable for longer than the installation itself. The sequence that takes time is preparation rather than the flooring: grinding produces a great deal of dust, self-levelling compound needs to cure before anything goes on top of it, and moisture testing itself takes time in place before results exist. Tile adds grouting and curing. A floating vinyl floor in a single room might be down in a day with the room back in use the next; a tiled floor over a slab that needs levelling is realistically a week. Ask for a day-by-day schedule rather than a total duration, ask specifically which days you cannot walk on the floor, and agree in advance who moves the furniture and where it goes, because that assumption is a frequent source of friction on the first morning.
Are these prices a quote from Tegula Stone? +
No. They are general cost ranges for the Los Angeles area, given so you can sanity-check a bid rather than price a job from a web page. What actually moves the number on a slab project is how much preparation the concrete needs, which nobody can know precisely until it is exposed, along with the product you choose, the room layout, and how much cutting is involved around cabinets, closets and doorways. Get written quotes from more than one independent contractor with the same scope listed in each, and pay as much attention to what is excluded as to the total. Tegula Stone connects homeowners with independent flooring specialists in and around Lawndale; it does not perform the work, does not employ the contractors, and does not set their prices.

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