Can You Put Pavers Over Concrete? 4 Checks Before You Do
An old concrete patio can be a great base for pavers, or a bad one. The four checks that decide it, the three ways to put pavers over concrete, and when tearing the slab out is the smarter money.
Can you put pavers over concrete? Yes, and when the old slab is sound it’s a smart shortcut: no jackhammer, no dump runs, and the slab becomes a rock-solid base. But a cracked, heaving or badly pitched slab passes every one of its problems straight up into the new pavers.
Before you buy a single pallet, run the four checks below. Then pick the install method that fits your climate. In a freeze-thaw state like Pennsylvania, that choice matters more than most people expect.
Quick answer
Yes, if the slab passes four checks: it’s structurally sound (hairline cracks are fine, heaving or shifting isn’t), it drains (pitched away from the house, with drain holes at the low edge), you have the height to spare at doors and steps (about 2¼–3½ inches for a sand-set overlay), and it carries foot traffic, not cars. In cold climates the usual method is sand-set: filter fabric, about 1 inch of bedding sand, the pavers, and an edge restraint anchored to the slab.
Check 1: Is the slab sound?
The slab becomes your base, so it has to be stable. Unilock and Nicolock both treat hairline cracks as normal. Wide gaps, widening cracks, and heaving or rocking sections point to ground movement, and Unilock says to rebuild on a stone base instead. Belgard is blunt about it: differential settlement or movement isn’t acceptable under an overlay.
Walk the slab with a straightedge and look for:
- Lips where one section sits higher than the next
- Sections that rock or sound hollow when you step on them
- Cracks that have opened up or shifted in the last few years
- Low spots that hold water
Movement is the deal-breaker. A slab that heaves every winter will heave the pavers with it, and as Nicolock points out, water that gets into damaged concrete can freeze, expand and move the pavers above it. Stable cracks still get attention: CMHA’s application guide says to patch cracks ⅜ inch or wider before an overlay goes down.
Check 2: Does the slab drain?
Water has to get off the slab, or it sits in the bedding sand and freezes. Belgard calls for the slab to slope 1.5–2% away from any building, the same pitch a new patio needs. Our patio slope guide has the per-foot math.
Even a well-pitched slab needs a way to drain the bedding sand, because water seeps down through the joints and sits on the concrete. That’s what drain holes are for:
- Belgard: 2-inch holes every 24 inches along the low edge, plus about one per 200 square feet in the field, filled with No. 8 stone and covered with filter fabric.
- Cambridge: 2-inch holes at the low points, filled with pea gravel.
- CMHA’s application guide: drain holes at the lowest points, covered with geotextile so the sand can’t wash down into them.
A slab pitched toward the house is a different problem. Drain holes won’t fix it, and a uniform layer of sand and pavers will carry the same bad pitch. That slab needs to be raised or replaced first.
Check 3: Do you have the height?
Putting pavers over concrete with the sand-set method usually adds about 2¼ to 3½ inches on top of the slab: the paver plus about an inch of sand. Here’s how it works out:
| Overlay | Paver thickness | Total height added |
|---|---|---|
| Thin overlay paver, sand-set | 1¼ in. | about 2¼ in. |
| Standard paver, sand-set | 2⅜ in. | about 3⅜ in. |
| Porcelain paver, sand-set | ¾ in. (20 mm) | about 1¾ in. |
| Thin paver, mortar or adhesive set | 1¼–1⅜ in. | about 1½–2 in. |
Then check every place the new surface meets something else:
- Doors. Raising the patio shrinks the step down from the threshold. Keep enough drop to keep snowmelt and blown rain off the sill. The code’s limits on how far a landing sits below a door are maximums, so the risk here is water, not code.
- Steps. Pennsylvania’s code allows stair risers up to 8¼ inches (the model IRC says 7¾), and both allow no more than ⅜ inch of difference between the tallest and shortest riser in a flight. Raise the landing at the bottom by 2½ inches, and the bottom riser is now 2½ inches shorter than the rest, a classic trip hazard.
- Garage slabs, walks and lawn edges. The new surface has to meet each of them without a lip.
If the height doesn’t work, use a thinner paver or take the slab out.
Check 4: Foot traffic or vehicles?
Patios, walks, porches and pool decks are good overlay candidates. Driveways are a different story. Belgard’s overlay method is for foot traffic only. CMHA’s application guide limits mortared pavers to pedestrian areas, doesn’t recommend adhesive-set pavers where cars drive, and says thin units of 1¼ to 1¾ inches aren’t for vehicles either.
CMHA does publish a sand-set overlay spec that covers vehicle traffic, but it’s written for a design professional to adapt to the specific job. For a driveway, either get that engineering done or plan on removing the slab and building a proper paver base.
Three ways to put pavers over concrete
| Method | How it’s built | Best for | Watch out for |
|---|---|---|---|
| Sand-set (unbonded) | Filter fabric on the slab, about 1 in. of coarse sand, pavers, anchored edge restraint, drain holes | Patios and walks in freeze-thaw climates | Needs a solid edge; standard pavers add the most height |
| Mortar-set (bonded) | Thin pavers bedded in latex-fortified mortar or thin-set | Foot traffic, porches and steps in mild climates | CMHA limits mortared pavers to pedestrian areas without freeze-thaw; slab cracks show through |
| Adhesive-set | Thin pavers or edge courses glued down with a paver adhesive | Edges, steps and small areas | The slab must be sound; CMHA says adhesives can be used in freezing climates, but not under cars |
Sand-set over fabric is the go-to for patios in Pennsylvania. Belgard’s version: lay filter fabric on the slab and fold it up the edges, spread 1 inch of ASTM C33 sand, set the pavers, and anchor a low-profile edge restraint, about 1½ inches tall, into the concrete.
Thin products make the height work: concrete overlay pavers run about 1¼–1¾ inches thick, thin clay pavers about 1⅜, and Belgard sets its ¾-inch porcelain pavers on sand with spacers and a roller compactor.
Builder’s note: in freeze-thaw country, a mortar-set overlay is the riskiest choice. Cracks in the old slab tend to come right up through the mortar, and water that gets under the pavers has nowhere to go when it freezes. CMHA’s application guide says mortared pavers belong only in pedestrian areas where it doesn’t freeze, because the joints break down under freeze-thaw and deicing salt. Sand-set over fabric, with drain holes and a solid edge, moves with the seasons instead of fighting them.
Putting pavers over concrete steps and porches
Concrete steps and stoops can be clad too, but only if they’re sound and correctly sized to begin with. Unilock’s step-overlay guide calls for:
- Coping on the step edges at least as thick as the field pavers, never thinner
- Open joints of ⅛ to 3/16 inch at the perimeter so water can drain, caulked only along the top and front
- A waterproof membrane, especially over a basement or cellar
- Concrete adhesive and shims to set the units, with thin-set given 24 hours to cure
Mind the risers here too. Cladding every tread raises each step by the same amount, so the risers in the middle stay equal, but the bottom riser grows unless the walk below rises too. Plan the steps, the landing and the walk together.
Overlay or tear out? The cost math
The main savings from an overlay is the demolition you skip. Angi puts concrete removal at $2–$6 per square foot including disposal, more for reinforced slabs. HomeGuide’s range is $3–$8 per square foot, with rebar adding $1–$3, and puts removing a 20-by-20-foot patio at $1,200–$3,000. Nicolock lists demolition, debris and labor as the savings without putting a number on it.
The catch: you’re betting the old slab stays put for the life of the new pavers. If it starts moving in five years, you pay to remove pavers and concrete. Our rule of thumb is simple. Overlay a slab that’s sound, drains and leaves enough height; tear out one that fails any of the four checks. Our guide to how long pavers last explains why the base is the whole game, and our paver patio ideas can help you pick what goes on top.
FAQ
Can you put pavers over a cracked concrete patio?
If the cracks are hairline and stable, yes, and CMHA says to patch any crack ⅜ inch or wider first. Wide or growing cracks, or sections that heave or rock, point to ground movement; rebuild on a stone base instead.
How much height do pavers add over concrete?
About 2¼ to 3½ inches for a sand-set overlay. A thin 1¼-inch overlay paver on an inch of sand adds about 2¼ inches; a standard 2⅜-inch paver adds about 3⅜. Mortar- or adhesive-set thin pavers add less.
Do you need to drill holes in concrete before laying pavers?
Usually, yes, even on a pitched slab. Belgard’s overlay detail calls for 2-inch holes every 24 inches along the low edge plus about one per 200 square feet, filled with stone and covered with filter fabric.
Can you put pavers over concrete steps?
Yes, if the steps are sound and correctly sized. Use a waterproof membrane, leave small drainage joints at the perimeter, set the units with adhesive, and check that the risers stay even.
Is it cheaper to put pavers over concrete or remove it?
An overlay saves the removal, about $2–$8 per square foot according to Angi and HomeGuide. That only pays off if the slab is sound; a failing slab under new pavers costs more in the end.
Can you put pavers over a concrete driveway?
Not with the usual overlay methods. Belgard’s overlay is for foot traffic only, and CMHA doesn’t recommend mortar-set, adhesive-set or thin pavers where cars drive. CMHA’s vehicle-rated overlay spec needs a design professional, so most driveways get the slab removed and a proper base built.
Do you need special pavers to go over concrete?
No, but thin overlay pavers, around 1¼–1¾ inches, or porcelain keep the added height down. Keep thin units off driveways.
Sources: Unilock, installing pavers over concrete (May 2026); Nicolock, pavers over concrete (May 2026); Belgard Technical Resource Guide; Cambridge Pavingstones, concrete base; CMHA, PAV-GSP-006-25 overlay spec; CMHA, PAV-GSP-010-25 mortar setting bed; CMHA, PAV-TEC-010 application guide (2022); Unilock, porch and step overlay; 34 Pa. Code § 403.21 (PA stair amendments); Angi, concrete removal cost (Sep. 2026); HomeGuide, concrete removal cost.
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