Pavers Over Concrete: Upgrade Your Patio the Right Way

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Man installing pavers over concrete patio

Yes, you can install pavers over an existing concrete slab — but only when three conditions are true: the slab is structurally sound with no active movement, it drains away from your home at a minimum slope of 1/4" per foot, and the finished height increase won’t block doors or create unsafe step transitions. Industry experts are clear that slab condition is the single biggest predictor of whether an overlay succeeds or fails within a few seasons. Unilock guidance, ICPI/CMHA specifications, and standard contractor practice all point to the same starting point: assess the slab first, then decide on the method.

Table of Contents

When does overlaying pavers over concrete actually make sense?

A paver overlay is a smart move in specific situations. It is not a universal fix for every tired concrete surface, but when the conditions line up, it saves real money and time compared to full demolition.

Good-fit scenarios:

  • Cosmetically worn concrete with surface scaling, discoloration, or minor surface cracks under 1/8" that have been stable for years
  • Small patios (typically under 400 sq ft) where the slab is level and drains correctly
  • Pool decks with adequate clearance at coping and no active settlement
  • Walkways and low-traffic pedestrian paths where the slab is solid underfoot
  • Situations where demolition costs would exceed the value of the project (concrete removal and disposal can be significant for a standard patio, according to Angi)

Bad-fit scenarios:

  • Active or recently widening cracks, especially with vertical displacement between slab sections
  • Slabs that slope toward the house or have low spots where water ponds after rain
  • Large areas of heaving or settlement (more than 1/2" elevation variance)
  • Slabs with significant spalling, delamination, or soft spots that flex underfoot
  • Garage aprons or driveways with regular heavy vehicle traffic (unless using a mortar-set system on a confirmed 4,000 psi, 4" minimum slab)

The core trade-off is straightforward. Overlaying saves demolition cost and time. But you are building on top of whatever problems exist in the concrete below. Any movement, cracking, or drainage failure in the slab will eventually transfer to the pavers above it. A full slab replacement on a properly compacted stone base gives you a clean start; a pedestal or raised system offers a middle path where drainage under the paver is engineered in. For most homeowners with a sound, well-draining slab, the overlay is the right call. For everyone else, the math often favors removal.

How do you evaluate your concrete slab before overlaying?

This is the step most DIYers skip, and it is the one that determines everything. Walk the slab slowly and listen. A hollow thud underfoot means the concrete has separated from the subgrade below — that section is unsupported and will move. A solid, consistent sound means good contact.

Slab inspection checklist:

  • Walk every section and listen for hollow spots; mark them with chalk
  • Probe edges and expansion joints for crumbling, soft material, or gaps wider than 1/4"
  • Measure cracks with a credit card (roughly 1/32") or a crack gauge: hairline cracks under 1/8" that have been stable are generally acceptable for overlay; cracks wider than 1/4" or with any vertical displacement signal active movement and need repair or removal
  • Check for vertical displacement between slab sections: anything over 1/2" is a red flag that points toward removal rather than overlay
  • Look for spalling (surface flaking) and delamination; light surface scaling can be ground down, but deep spalling that exposes aggregate means the slab surface is structurally compromised
  • Check for ponding after a rain event; any area that holds water for more than 30 minutes needs drainage correction before overlay

Repair options by severity:

For hairline cracks under 1/8", a polymer-modified concrete patch product works well and bonds cleanly to the existing surface. High spots from previous repairs or uneven sections can be ground down with a concrete grinder. Cracks between 1/8" and 1/4" with no displacement can often be filled with a flexible polyurethane caulk before overlay, but photograph them first and monitor for growth. Anything with displacement, active widening, or hollow sections underneath needs a structural assessment before you spend money on pavers.

Inspector examining cracks on concrete slab

Pro Tip: Photograph every crack, hollow spot, and low area before you call a contractor. Date the photos. If you check again in 30 days and the cracks have grown, that slab is actively moving and is not a candidate for overlay.

Infographic showing steps to evaluate slab for paver overlay

Does your slab drain well enough for a paver overlay?

Drainage is the number one cause of paver overlay failure, and it is the detail that separates a 15-year installation from one that starts rocking and heaving after two winters. Professional contractors consistently cite trapped water and poor slope as the primary reason overlays fail — not the pavers themselves.

Drilling drainage holes in concrete slab

Concrete is impermeable. When you lay pavers over it with a sand bed, any water that gets through the joints has nowhere to go unless you plan for it. In freeze-thaw climates, that trapped water expands, lifts pavers, and erodes bedding sand. In hot climates like Texas, it creates a moisture trap that accelerates joint sand washout and promotes mold growth under the surface.

How to measure slope:

Place a 4-foot level on the slab surface and raise one end until the bubble centers. Measure the gap between the level and the slab at the raised end. A 1" gap over 4 feet equals a slope of 1/4" per foot — the minimum acceptable grade draining away from your home. Less than that, and you need to address drainage before proceeding.

Fix options:

  • Drill weep holes through the slab at low points (typically 1/2" to 3/4" diameter, angled slightly downward) to allow trapped water to escape; fill the hole area above with pea gravel wrapped in geotextile fabric to prevent bedding sand from washing through
  • Add perimeter drains at the low edge of the patio, connected to a proper outlet away from the foundation
  • Correct external grading around the slab perimeter so surface water doesn’t flow back onto the patio
  • Use a pedestal or raised system where drilling is not feasible (attached slabs, post-tension concrete, or roof decks); pedestal systems lift pavers above the surface to allow free drainage underneath and are standard practice on rooftop terraces

Pro Tip: When drilling weep holes, space them every 4–6 feet along the low edge of the slab and angle the drill bit 10–15 degrees downward. Pack the top 2" of each hole with pea gravel inside a small sleeve of geotextile fabric — this keeps bedding sand from funneling out while still letting water drain freely.

What materials and tools do you need for the job?

Getting everything on-site before you start saves a full day of back-and-forth trips. Here is what a complete overlay project requires.

Materials:

  • Bedding sand: Coarse, concrete-rated bedding sand (ASTM C33 or equivalent) screeded to 1/2"–1" depth; do not use fine play sand, which compacts unevenly
  • Polymeric sand for joints: Products like Gator Polymeric Sand activate with water and harden in the joints to resist washout and weed growth; follow manufacturer instructions for activation
  • Edge restraints: Plastic or aluminum paver edging with spikes; ICPI/CMHA guide specifications require edge restraints to prevent lateral creep — this is non-negotiable
  • Geotextile fabric: Used over drilled weep holes and optionally under bedding sand at slab edges to prevent migration
  • Adhesive or mortar: Only for thin-set or mortar-set methods; use a polymer-modified mortar for bonded installations
  • Pavers: Select thickness based on your height budget; standard concrete pavers run 2 3/8" thick; thinner porcelain or travertine overlays can run as thin as 3/4"–1"

Tools:

  • Pressure washer (minimum 2,000 PSI) for slab cleaning
  • Concrete grinder or angle grinder with diamond cup wheel for high spots
  • Screed rails (1/2" or 3/4" PVC pipes work well) and a straight screed board
  • Plate compactor with a rubber or foam protective mat (never run a bare steel plate over pavers on concrete — it chips edges and cracks units)
  • Masonry saw or paver splitter for cuts
  • Rubber mallet for seating individual units
  • Paver spacers for consistent joint width
  • 4-foot level and tape measure
  • Broom and leaf blower for polymeric sand activation

Where to buy:

Big-box stores like Lowe’s carry bedding sand, polymeric sand, basic edge restraints, and standard concrete pavers. For specialty products — larger-format porcelain pavers, premium edge restraint systems, or specific paver profiles — a local landscape supply yard typically offers better selection and can cut materials to size. When selecting paver thickness, always calculate the finished height increase before purchasing (see Section 8 below).

Safety note: Wear safety glasses and an N95 respirator when grinding concrete or drilling weep holes. Concrete dust contains silica, which is a serious respiratory hazard. For pavers over 60 lbs per unit, use a two-person lift or a paver cart — back injuries are the most common DIY hardscape injury.

How do you install pavers on existing concrete, step by step?

The sequence matters as much as the individual steps. Skipping ahead or reversing the order creates problems that are expensive to fix after the pavers are down.

The sequence at a glance: clean and assess → repair cracks and grind high spots → address drainage → install edge restraints → screed bedding sand → lay pavers → compact → fill joints with polymeric sand → test slope and clean up.

  1. Clean the slab thoroughly (half a day). Pressure wash the entire surface at 2,000+ PSI to remove dirt, algae, oil, and any loose material. Let it dry completely — 24 hours minimum. Any contamination under the bedding sand will cause uneven settlement.

  2. Repair cracks and level high spots (half a day to 1 day). Fill hairline cracks with polymer-modified patch compound. Grind down any high spots or previous patch repairs that would create an uneven bedding surface. Let repairs cure per product instructions before proceeding.

  3. Verify slope and drill weep holes if needed (2–4 hours). Use your 4-foot level to confirm slope. If low spots exist or slope is inadequate, drill weep holes now before any bedding goes down. This is the last chance to fix drainage without removing pavers.

  4. Install edge restraints (1–2 hours). Snap chalk lines for your paver field boundary. Secure plastic or aluminum edging along all open edges with 10" spikes driven into the concrete or adjacent soil. CMHA/ICPI specifications require edge restraints on all sides to prevent lateral movement over time.

  5. Screed the bedding sand (2–4 hours). Set screed rails (PVC pipes) at the correct height for your target bedding depth — typically 1/2" to 1" as recommended by Unilock’s installation guidance. Pull a straight board across the rails to create a flat, even surface. Do not walk on screeded sand before laying pavers.

  6. Lay the pavers (1–2 days for 200–400 sq ft). Start from a straight reference edge or a corner. Place each paver with a slight forward tilt, then set it down flat — this seats it without sliding the bedding sand. Use spacers for consistent joints. Check alignment with a string line every 4–6 rows and adjust before the pattern drifts.

    Pro Tip: When you reach drain holes, position a joint directly over each hole so polymeric sand does not fully seal it. A small gap in the joint above a weep hole keeps the drainage path open without being visible from standing height.

  7. Compact the pavers (1–2 hours). Run a plate compactor over the entire field with a rubber or foam protective mat between the plate and the paver surface. Make two passes in perpendicular directions. This seats pavers firmly into the bedding sand and eliminates rocking.

  8. Fill joints with polymeric sand (2–3 hours). Sweep Gator Polymeric Sand or a similar product across the surface, working it into joints with a broom. Blow off excess with a leaf blower. Lightly mist with water per the product’s activation instructions. Do not oversaturate — too much water washes the binder out of the joints before it sets.

  9. Final check and cleanup (1 hour). Walk the entire field and press each paver. Any rocking unit needs to be lifted, bedding corrected, and reset before the polymeric sand fully cures. Check that water drains away from the house by running a hose at the high end.

Total DIY timeline for a 200–400 sq ft patio: 3–4 days for a two-person crew, assuming the slab is in good condition and no major drainage work is required.

Which installation method is right for your project?

Three distinct methods exist for installing pavers on existing concrete, and the right choice depends on your slab condition, how you use the space, and how permanent you want the result to be.

Quick summary before the table:

  • Sand-set is the most common method for residential patios; it tolerates minor slab imperfections and allows individual pavers to be lifted and reset
  • Mortar or adhesive-set creates a permanent bond but is less forgiving of thermal expansion or minor slab movement; best for thin tiles and non-flexing applications
  • Pedestal/raised systems are the right call when drainage under the paver is required and drilling weep holes is not practical
Method Slab condition needed Drainage behavior Added height Best uses Cost/permanence Maintenance
Sand-set Sound, stable, properly sloped Water drains through joints to slab surface; weep holes required if slope is poor 1.5"–3" (sand + paver) Pedestrian patios, walkways, pool decks Lower cost; pavers can be lifted and reset Periodic joint sand replenishment; easy single-unit repairs
Mortar/adhesive-set Sound, non-moving, clean surface Impermeable; relies entirely on slab slope 3/4"–2" (thin tile or paver) Thin porcelain overlays, decorative accents, non-flex areas Moderate cost; permanent bond Cracked units are harder to replace; slab movement causes joint cracking
Pedestal/raised Any stable slab; also roof decks Excellent; free drainage under entire paver field 2"–6"+ depending on pedestal height Roof terraces, areas where drilling is impractical, accessible surfaces Higher cost; fully adjustable Pedestals can be adjusted or replaced; no bedding sand to wash out

A few important notes on method selection:

  • Sand-set is the right default for most homeowners with a sound residential patio slab. It gives you the flexibility to lift and re-bed a rocking unit without breaking up the whole field.
  • Mortar-set looks appealing for thin porcelain pavers, but pavers installed over a moving or settling slab will transfer that movement directly into the bonded surface, causing cracked joints and lifted tiles that are expensive to repair.
  • Pedestal systems add cost upfront but pay off on roof decks, covered patios over living spaces, or anywhere a future plumber or electrician might need access under the surface.

For a pedestrian patio on a sound, sloped slab, sand-set is the practical choice. For occasional vehicle parking, a mortar-set or full-bond system on a confirmed 4,000 psi, 4" minimum slab is the safer call.

How do you handle the height increase at doors and transitions?

A small change in finished surface elevation can create a tripping hazard or block a door from swinging open — and Unilock’s installation guidance specifically flags this as a common oversight that requires measurement before you commit to any overlay.

How to calculate your added height:

Typical sand-set overlay adds a few inches of height depending on the thickness of the bedding sand and pavers used. Thinner paver options can reduce the overall height increase. Porcelain or travertine overlays bonded with thin-set mortar can add as little as 3/4"–2" total.

What to check before you start:

  • Exterior doors: Measure the clearance between the bottom of the door and the current concrete surface. Most exterior doors need at least 1/2" clearance to swing freely; if your overlay brings the surface within 1/4" of the door bottom, you need to either use thinner pavers, back-cut the door, or remove concrete at the threshold
  • Sliding glass doors: These typically have a lower threshold than hinged doors and are the most commonly affected; measure carefully
  • Pool coping: The paver surface should finish flush with or slightly below the coping edge; a surface that rises above coping creates a lip that catches feet
  • Step risers: Adding height to a patio changes the effective riser height of the first step down from the door; a riser that was 7" becomes 4" after a 3" overlay, which can feel awkward and create a tripping risk in the other direction
  • Exterior vents and cleanouts: Make sure the overlay does not cover or restrict access to foundation vents, dryer exhausts, or utility cleanouts
  • Garage thresholds: Garage door seals are designed for a specific gap; raising the apron surface can prevent the door from sealing properly

When the height increase is unavoidable, a ramped transition strip (available at Lowe’s in aluminum or rubber) creates a gradual change between the new paver surface and an adjacent lower surface. For more complex transitions at steps or pool decks, a contractor can cut back the existing concrete at the threshold to maintain the correct finished height.

What does a paver overlay cost, and how long does it take?

The cost difference between DIY and contractor-installed overlays is significant, but so is the skill gap on drainage work and complex cuts. Here is a realistic breakdown for a typical 200–400 sq ft residential patio.

Cost item DIY (materials only) Contractor-installed
Paver units (concrete, standard) costs vary and depend on product choice Included in labor+material quote
Bedding sand and polymeric sand costs vary depending on quantity and supplier Included
Edge restraints costs vary depending on product type Included
Drainage work (weep holes, perimeter drain) material costs vary based on project scope $200–$600 labor+materials
Slab crack repairs material costs vary depending on repair extent $100–$300 labor+materials
Labor varies widely depending on DIY or professional installation and location
Total estimate (200–400 sq ft) $600–$2,500 $3,000–$8,000

Concrete demolition and disposal, if you choose full removal instead of overlay, can add significantly to the project cost before any new installation begins.

Timeline expectations:

  • DIY, 200 sq ft, sound slab: 2–3 days
  • DIY, 400 sq ft with drainage work: 4–5 days
  • Contractor-installed, 200–400 sq ft: 1–3 days on-site (plus scheduling lead time)

Pro Tip: Always budget a 15–20% contingency on top of your materials estimate. Slab repairs, unexpected drainage issues, and door threshold adjustments are the three most common cost surprises — and they almost always come up once you start looking closely.

How do you maintain pavers on concrete, and what can go wrong?

A well-installed overlay on a sound slab is genuinely low-maintenance. Most problems trace back to installation shortcuts, not the pavers themselves.

Routine maintenance checklist:

  • Sweep polymeric sand into joints once or twice a year as it settles; top up with fresh product and re-activate with water
  • Reseal every 3–5 years with a penetrating paver sealer to protect against staining and slow joint sand erosion
  • Clean with a pressure washer at low-to-medium pressure (under 1,500 PSI on the surface) annually; avoid high-pressure direct blasting of joints, which strips polymeric sand
  • Winterize in freeze-thaw climates: avoid metal snow shovels that chip paver edges; use plastic shovels or a rubber-edged blade; apply a calcium chloride-based deicer sparingly (sodium chloride is harder on concrete pavers)

Common problems and fixes:

  • Rocking pavers: Lift the unit with a paver puller or two flat screwdrivers, add or redistribute bedding sand, and reset. Compact with a rubber mallet. This is a 15-minute repair when caught early.
  • Joint sand washout: Usually caused by inadequate drainage or high-pressure cleaning. Re-sweep polymeric sand and check that weep holes are clear.
  • Staining: Oil and rust stains respond to purpose-made paver cleaners (available at Lowe’s or landscape supply yards). Efflorescence (white salt deposits) is normal in the first year and brushes off with a stiff broom or diluted muriatic acid solution.
  • Trapped moisture symptoms: Persistent dark patches that don’t dry, mold growth on the surface, or a musty smell near the patio edge all suggest water is pooling under the pavers. Check weep holes for blockage and inspect perimeter drainage.

When a single rocking paver becomes a pattern across a section of the patio, that is no longer a maintenance issue. It signals that the slab below is moving, the bedding sand has migrated, or a drainage problem has eroded the base. At that point, lifting the affected section and reassessing the slab is the right move before the problem spreads.

When should you hire a pro instead of doing it yourself?

Let’s be real: a straightforward overlay on a sound, well-draining patio is a manageable DIY project for someone comfortable with physical labor and basic measuring. But several situations genuinely call for a professional.

Red flags that mean stop and call a contractor:

  • Cracks that have widened since you first noticed them, or cracks with vertical displacement between sections
  • Any section of slab that flexes or moves when you walk on it
  • Water ponding near the foundation after rain
  • More than 1/2" of elevation variance across the slab
  • A slab that slopes toward the house rather than away from it
  • Tree roots visibly lifting sections or running under the slab edge

Questions to ask any contractor before signing:

  • Have you done paver overlays specifically (not just new installations on a prepared base)?
  • Can you show references or photos of overlay projects, including how you handled drainage?
  • Do you follow ICPI/CMHA specifications for bedding sand grading, edge restraints, and compaction?
  • How do you handle weep holes and perimeter drainage on this slab?
  • What is your warranty on the installation, and what voids it?
  • Are you licensed and insured for hardscape work in this state?

If the slab shows signs of subgrade settlement (sections that have sunk unevenly, not just surface cracking) or if you suspect tree root damage running under the slab, request a structural or geotechnical assessment before any overlay work begins. Overlaying a slab with active subgrade movement is the most expensive mistake a homeowner can make in this category.

What do industry experts say about overlay failures?

The consistent message from contractors and technical sources is this: the slab is the foundation, not the backdrop. Treating an overlay as a cosmetic fix for a structurally compromised surface is the most common reason these projects fail.

Drainage engineering — weep holes, perimeter drains, and corrected grading — is often the difference between a paver overlay lasting a decade and failing in a few cold seasons. Contractors who skip this step are essentially building on a ticking clock.

Sarros Landscaping’s contractor guidance and Civil Engineering Daily’s technical review both emphasize that drainage is the primary failure mode, not paver quality or installation technique. The pavers themselves are rarely the problem.

Mortar-set systems add a specific risk. Belgard’s installation guidance notes that mortar creates a permanent bond that is far less forgiving of thermal expansion or minor slab shifting than sand-set methods. On a slab that experiences even small seasonal movement, a mortar-set overlay will develop cracked joints within a few years.

The “locking in” problem is real and worth understanding. When you mortar or glue pavers over a slab with hidden structural issues, you make those issues harder and more expensive to fix. A sand-set overlay at least allows you to lift sections and address the slab below without destroying the pavers. Mortar-set means demo when the slab eventually moves.

Pro Tip: For borderline slabs — ones that pass the basic checks but have a few repaired cracks or one hollow section — consider overlaying a small test area of 50–100 sq ft first. Live with it through one full seasonal cycle before committing to the full project. It is the cheapest insurance available.

Key Takeaways

Installing pavers over an existing concrete slab works when the slab is structurally sound, drains away from the house at 1/4" per foot minimum, and the finished height increase is manageable at doors and transitions.

Point Details
Slab condition decides everything A structurally sound, stable slab with no active movement is the non-negotiable starting point for any overlay.
Drainage is the top failure mode Verify slope at 1/4" per foot minimum and drill weep holes or add perimeter drains before laying any bedding sand.
Crack thresholds matter Hairline cracks under 1/8" are generally acceptable; cracks over 1/4" or with vertical displacement signal active movement requiring repair or removal.
Height increase affects doors and safety A typical sand-set overlay adds 1.5"–3" of height; measure door clearance and step risers before selecting paver thickness.
Pave-n-turf handles the full scope Pave-n-turf provides onsite slab assessment, drainage solutions, and complete paver installation across the Dallas-Fort Worth and Austin areas.

The part most homeowners get wrong

The most common mistake in a paver overlay project is not the installation itself. It is the decision to proceed before the slab has been properly assessed. Homeowners see a worn concrete patio, price out pavers, and start buying materials before they have checked slope, probed for hollow spots, or measured door clearance. The slab evaluation takes a few hours. Skipping it can cost thousands.

The second most common mistake is underestimating how much a 2–3" height increase changes the feel and function of a space. A door that swings freely today may drag after the overlay. A step that felt natural becomes a stub-your-toe hazard. These are not hard problems to solve, but they require measuring before purchasing.

There is also a tendency to treat drainage as optional — something to address “if it becomes a problem.” In freeze-thaw climates, that approach fails reliably. In hot climates like North Texas, trapped moisture under an impermeable slab accelerates joint sand erosion and creates a surface that needs constant maintenance. Drilling weep holes before the pavers go down takes an afternoon. Lifting and relaying a patio because the drainage was wrong takes a week and costs real money.

The projects that hold up for 15–20 years share three traits: the slab was honestly evaluated, drainage was engineered before the first paver was placed, and edge restraints were installed correctly per ICPI/CMHA specs. That is the whole formula.

Pave-n-turf makes the slab-to-paver process straightforward

Knowing whether your slab qualifies for an overlay — and what drainage or height fixes it needs first — is exactly where most homeowners get stuck. Pave-n-turf’s team handles that assessment onsite, so you get a clear recommendation before any materials are purchased or work begins.

Pave-n-turf

For homeowners across the Dallas-Fort Worth and Austin areas, Pave-n-turf provides the full scope: slab evaluation, drainage corrections (weep holes, perimeter drains, grading), edge restraint installation, paver laying, compaction, and polymeric sand jointing. If the slab needs partial removal or threshold adjustments at doors, that is part of the quote, not a surprise on installation day. The team also offers landscape paver and turf combinations for homeowners who want to pair a new paver patio with low-maintenance artificial turf in adjacent areas.

To get an accurate estimate, gather your slab dimensions, photograph any cracks or low spots, and note your door clearance measurements. That information lets Pave-n-turf price the project precisely rather than building in a large contingency for unknowns. Request your onsite assessment at pave-n-turf.com and get a clear plan before you commit to anything.

Useful sources

These resources provide the technical depth behind the guidance in this article. Each one is worth bookmarking if you are planning a paver overlay project.

FAQ

What is the cheapest way to cover a concrete patio?

A sand-set paver overlay is typically the most cost-effective option, with DIY material costs running $600–$2,500 for a 200–400 sq ft patio, compared to $3,000–$8,000 for a contractor-installed project. Concrete demolition alone can exceed $1,100, making an overlay significantly cheaper than full replacement when the slab is sound.

What is the best way to adhere pavers to concrete?

For most residential patios, sand-set (screeded bedding sand without adhesive) is the preferred method because it tolerates minor slab imperfections and allows individual units to be lifted and reset. Mortar or polymer adhesive is used for thin porcelain overlays but should only be applied to confirmed non-moving slabs, since bonded systems crack when the slab shifts.

Can you lay paving slabs straight onto concrete?

Yes, with a 1/2"–1" bedding sand layer screeded between the concrete and the pavers. Laying directly on bare concrete without bedding sand creates an uneven surface and prevents any drainage path; the sand layer levels minor imperfections and allows water to move toward weep holes or the slab edge.

Should I put concrete under my pavers?

For a new installation from scratch, a compacted aggregate base is the standard approach rather than a concrete slab. However, if an existing concrete slab is already in place and is structurally sound, it can serve as the base for a paver overlay, saving the cost of demolition and a new base installation.

How do freeze-thaw cycles affect pavers over concrete?

In climates with hard freezes, trapped water under an impermeable concrete slab expands as it freezes and can lift pavers, erode bedding sand, and crack joints. Proper drainage — verified slope, drilled weep holes, and perimeter drains — is the primary defense. Polymeric sand in joints also reduces water infiltration compared to regular jointing sand.

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