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Concrete Resurfacing in San Francisco, CA
Concrete resurfacing, as this page uses the term, means a new cement wearing surface laid on a worn floor slab in a garage, basement, shop or warehouse, and in San Francisco it turns on why the old surface failed and whether the slab beneath has stopped moving. A resurfacer is a polymer-modified mortar spread from a featheredge (a thin, blended edge) to about 1/2 inch; a self-leveling topping is poured and flows flat. Neither holds a slab still, since ARDEX's K 301 sheet says thin, non-structural overlays are "not capable of restraining movement in the structural slab." The USGS maps artificial fill over estuarine mud along the bay's edges, and the Bayview Hunters Point Area Plan records landfill "with little regard for soil stability and toxicity." HomeGuide's February 2026 survey prices resurfacing nationally at $3 to $7 a square foot; none covers San Francisco.
$3 to $7 a sq ft to resurface a slab, national (HomeGuide, February 2026) · full pricing guide
No survey prices resurfacing in San Francisco, so these figures are national. HomeGuide's resurfacing survey of February 3, 2026 gives garage and basement floors the same band, $3 to $5 per square foot basic and $4 to $7 complex, while interior floors run $3 to $8 basic and $5 to $15 complex; its average range is $300 to $700 per 100 square feet. HomeAdvisor's June 2026 epoxy survey warns that "Some contractors may also charge a minimum fee of $500 to $1,000." Wages here run above the national level: O*NET's Bureau of Labor Statistics 2025 data put the median hourly wage for cement masons and concrete finishers in the San Francisco-Oakland-Fremont metro at $36.53, against $27.41 for the country, a wage rather than a price. The floor cost tables carry the other surveys.
Three kinds of product share the word, and ICRI 310.2R sorts them by thickness: "Self-leveling toppings, 50 mils to 1/8 in.," "Polymer overlays, 1/8 to 1/4 in.," and "Concrete overlays and repair materials, >1/4 in." Among thin polymer-modified resurfacers, Sakrete's Flo-Coat goes from 1/2 inch down to a featheredge, a 40 lb bag covering 18 square feet at 1/4 inch or 72 at 1/16; NewCrete, from CTS, goes on as thin as a skim coat and up to 1/8 inch; Euclid's fiber-reinforced Euco Re-Cover names "Garage floors" among its uses. Poured toppings are primed, and PCA's IS177 says layers under 1 inch are "normally bonded to the slab and require a primer."
Preparation strips whatever the new layer cannot grip, starting with laitance, the weak top skin; Wolverine Coatings says pull-off strength "is actually weakest at the surface." Sakrete wants "sealers, paints, curing compounds, or glues" off, says a 2,500 psi pressure washer "will remove most contaminates," and dampens the slab to saturated surface dry (SSD), wet through with no standing water. SikaQuick Concrete Resurfacer asks for "CSP-3 minimum," a concrete surface profile (CSP) of light-shotblast roughness on ICRI's ten-step scale. Spalls are cut out first, by PCA's IS177 "to a depth of at least 40 mm (1-1/2 in.)" and about 4 inches past the unsound edge. Patch mortars have limits too: SikaQuick-1000 says "Do not feather edge," so a shallow scar suits Quikrete's Vinyl Concrete Patcher, which feathers to 1/16 inch on areas under 2 square feet.
Each layer has its own return-to-service time, and the slowest product sets the date. CTS's NewCrete is walkable after 2 to 3 hours and drivable after 4 to 8 hours; Euco Re-Cover takes feet in 4 hours and rubber tires in 12 hours at 75 degrees F; ARDEX CD can be walked on in about 2 hours, with full traffic left to the sealer's maker. Patches can be slower: Sakrete's Top 'N Bond opens to vehicles in 72 hours, and Quikrete allows wheels on its Vinyl Concrete Patcher after 3 days. Curing counts too, since SikaQuick Concrete Resurfacer wants moist curing "immediately after finishing" and NewCrete needs misting "In dry, windy or hot conditions." Clear the garage and park elsewhere until the slowest time has passed.
A resurfacing quote follows a visit, since the price depends on what lies under the worn surface. Beforehand, note the floor's size, cracks that have widened, hollow spots, oil or old paint, and the doors and drains the surface must meet. Get the product, thickness, joint plan and sealer in writing; for a home, section 7159 has the contract describe "the significant materials to be used." Section 7048 leaves only jobs under $1,000 with no building permit outside the license law, and CSLB's bulletin #24-07 rules out hired help as well. Ask San Francisco's Department of Building Inspection, or a San Mateo County city's own building division, whether lifting or replacing a slab needs a permit. Requests from this site reach independent local installers holding California contractor licenses; the hiring guide explains how to check one.
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Signs a floor slab can be resurfaced, not replaced
Resurfacing renews the top of a slab that still does its job underneath. Each check below needs only a straightedge, a hammer or a careful look. A slab that fails the first two needs an evaluation before any surface work.
- The slab does not rock, heave or sink; Wolverine Coatings calls a slab doing any of those an unlikely candidate for coating without repair.
- Its cracks have stopped moving, what ICRI calls dormant; cracks that still move are carried up through the new layer instead of filled.
- The damage is in the top skin: dusting, a powdery surface NRMCA's CIP 1 traces to finishing over bleed water or poor curing, or crazing, fine cracks its CIP 3 puts down to shrinkage of the surface layer.
- Hollow-sounding areas are limited, since NRMCA's CIP 20 patches a delamination after the loose layer comes off, and says extensive ones may need an overlay.
- Spalls, which PCA's IS177 says may be 1 inch or more deep and 6 inches or more across, often from poorly built joints or corroded steel, can be cut back and patched.
- The floor stays dry: ARDEX CD wants a substrate "dry and alkali free," and its K 15 underlayment is for dry interior areas only.
A slab that fails the first two checks needs an evaluation before any new surface: Wolverine says to have the concrete "evaluated by a competent engineer or contractor when in doubt." The fill under parts of San Francisco, described below, is one more reason to ask.
Fill, Bay Mud and Dune Sand Under San Francisco Slabs
Parts of San Francisco stand on ground people made, and no resurfacer changes what lies beneath a slab there. The USGS report on the region's deposits, Open-File Report 2006-1037, prepared with the California Geological Survey, maps artificial fill over estuarine mud as "Material deposited by humans over sediments along the margins of San Francisco Bay" and rates its liquefaction susceptibility "very high." Many damage reports from the 1906 San Francisco and 1989 Loma Prieta earthquakes, it notes, "involved failures in older fill that probably was not engineered." Bay mud "is unlikely to liquefy due to the abundance of clay" yet rates moderate for its high ground water, and dune sand, the ground SF Planning describes under the Richmond and Sunset, rates moderate too. The Central Waterfront plan says the old creeks and marshes "have vanished in favor of flat lands and fill," and the Bayview-Hunters Point page covers that district's landfill.
The State zones the same hazard: under the Seismic Hazards Mapping Act, passed after Loma Prieta, CGS liquefaction zones "identify where the stability of foundation soils must be investigated," and CGS's EQ Zapp lookup shows them by address. None of this says a given floor will settle. It explains why a crack that keeps opening, or a slab that rocks, deserves an evaluation before money goes into its surface.
Joints and Cracks: Honor, Fill or Stabilize Before Resurfacing
A resurfacer stuck to a slab moves with it, so the resurfacer sheets deal with joints and cracks before the first coat. NRMCA's CIP 6 calls joints "simply pre-planned cracks," and ICRI's terminology splits cracks into dormant, "not likely to become active in the future," and active, "still moving." Joints and moving cracks are honored, meaning the cut is carried up through the new layer. Quikrete says "control joints and expansion joints be maintained," Euclid says "Always re-establish floor and slab joints," and ARDEX warns that "Cracks may telegraph up into the surface in any area that exhibits movement"; ACI's overlay guidance places new joints "over all joints in the existing slab." Dormant cracks are filled.
ARDEX CD has any dormant crack wider than a hairline, 1/32 inch, pre-filled with its ARDIFIX polyurethane, which goes into service in 10 to 15 minutes; Sikadur-55 SLV seals cracks by gravity down to 2 mils, wants oven-dried sand in cracks over 1/8 inch, and "is not appropriate for use in dynamic cracks." Joint fillers guard edges rather than absorb movement. In Metzger/McGuire's Technical Bulletin T18, "Both polyurea and epoxy fillers typically have expansion capabilities of 15% or less," while "most joints will open 50-100% during normal slab shrinkage."
The 50 Degrees F Floor in Resurfacer Sheets, Set Against SF Normals
The resurfacer sheets set a 50 degrees F minimum, and the 1991-2020 NOAA normals for the Downtown San Francisco station put the normal daily low below it from December through April. Quikrete wants air and concrete between 50 and 90 degrees F for Re-Cap; Sakrete asks product, air and surface to stay above 50 degrees F "for a minimum of 24 hours"; NewCrete needs a surface of at least 50 degrees F; ARDEX CD holds substrate and ambient air at that minimum "During installation and cure." Downtown's lowest normal daily minimum is January's 46.6 degrees F, and San Francisco International Airport's is 44.5 degrees F, also in January. Those figures describe the outdoor air, not a garage slab under a house, but they show why a winter job in a cold ground-story room must hold the minimum through the cure, not just at the start.
Re-Cap's 90 degrees F ceiling rarely matters; Downtown's warmest normal daily maximum is 70.2 degrees F, in September. Downtown's normals also show 0.0 days a year, and 0.0 in every month, with a low of 32 degrees F or below, which bears on CTS's caution that TRU Self-Leveling is "not recommended in locations subject to freezing temperatures." The San Francisco floor data page tabulates both stations by month.
Resurfacer, topping, underlayment or new support
The inspection points to one of four routes: a thin resurfacer for a sound but worn slab, a poured topping for a sound but uneven one, an underlayment for a slab that will be covered, and evaluation and repair for a slab that has moved.
Thin resurfacer over a sound slab
A polymer-modified mortar, featheredge to 1/2 inch thick, renews the wearing surface, and ACI says bonded toppings "often do not result in a change in the floor surface elevation." ARDEX says its CD "should be sealed," with "a waterborne, breathable sealer." HomeGuide's February 2026 basic overlay row is $3 to $7 a square foot nationally. It suits a garage or basement slab that dusts, scales or pits but holds still.
Poured topping for an uneven floor
A self-leveling topping flows flat over a primed slab: ARDEX K 301 goes down between 1/4 and 3/4 inch thick unextended, or to 2 inches with aggregate, over an epoxy primer broadcast with sand, and "must be sealed or coated." HomeGuide's November 2025 leveling survey prices self-leveling concrete at $2 to $5 a square foot nationally. It suits a shop or basement with low spots; a polishable topping can become a polished concrete floor.
Underlayment under a new floor covering
An underlayment levels a slab that will be covered, not walked on bare. ARDEX K 15 takes "moisture-insensitive tile and stone after 6 hours, all other floor coverings after 16 hours," and Sika says Level-125 "must be protected from any type of contamination by installing a suitable floor covering." It suits a garage turned into living space, a common case by SF Planning's account: "Many ADUs are converted from existing storage or garage space."
Evaluate a slab that has moved
A slab that rocks or sinks is "an unlikely candidate for coating without repair," in Wolverine Coatings' words; a pavement guide sponsored by the Federal Highway Administration (August 2022) defines slab stabilization, for road slabs, as "Filling of voids beneath concrete slabs." HomeGuide's November 2025 leveling survey gives a 360 square foot garage floor $1,400 to $3,200 nationally by mudjacking and $2,900 to $9,000 by polyjacking, with foam. It suits a slab an engineer or contractor has evaluated.
Concrete Resurfacing FAQs
How much does concrete resurfacing cost in San Francisco?
No survey prices San Francisco, so the answer is national: about $3 to $7 a square foot in HomeGuide's February 2026 survey, which puts a 24x24 two-car garage at $1,700 to $2,900 and a basement or slab of 800 square feet at $2,400 to $4,000. Angi's July 2026 survey spans $600 to $13,000. A garage repair page from Fixr, updated January 2025, gives resurfacing $960 to $2,400. Crack repair can add $250 to $800, for minor surface cracks in Angi's figures and in HomeAdvisor's (June 2026).
Can a cracked garage floor be resurfaced?
Yes, if the cracks have stopped moving or are carried up through the new layer, because a thin resurfacer cannot hold a moving slab still. ACI's overlay guidance says "Any active cracks need to be stabilized to avoid being reflected through the topping." Cracks are filled first; Sakrete has any over 1/8 inch filled with Flo-Coat mixed to a trowel grade. HomeGuide's February 2026 survey adds that cracks wider than 1/4 inch "typically indicate foundation problems," a reason for an evaluation first.
Is resurfacing enough for a slab on bay fill?
Only if the slab has stopped moving; fill is a reason to check, not proof of a problem. The USGS rates artificial fill over the bay's estuarine mud "very high" for liquefaction susceptibility, and California Geological Survey liquefaction zones mark where a site-specific investigation is required before a development permit. A resurfacer bonds to the slab and moves with it, so a widening crack or a rocking slab calls for an engineer or contractor to evaluate it first, as Wolverine Coatings advises when in doubt.
Should a worn slab be resurfaced or replaced?
Keep the slab when the damage is skin deep; a slab "that is crumbling, rocking back and forth, heaving, or sinking" is, in Wolverine Coatings' words, "an unlikely candidate for coating without repair," so it needs an evaluation and repair first. HomeGuide's national pages show the gap: resurfacing at $3 to $7 a square foot (February 2026) against garage floor replacement at $10 to $16 or more (November 2025). Its resurfacing page says the work "lasts 8 to 15 years before needing any repairs," a survey estimate rather than a maker's rating.
Can you epoxy over a resurfaced floor?
Yes, once the topping's own sheet allows it and the surface is prepared again. On ARDEX K 301, a "Solvent-borne or 100% solids coating at a thickness up to 20 mils" waits "48 - 72 hours" and a thicker coating 7 days, and the topping "is not a vapor barrier," so the coating's moisture test still applies. Wolverine Coatings adds that "Normally, cementitious repair materials require additional surface preparation before a coating is applied." The garage floor epoxy page covers the coating.
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