Landscaping services
Paver patio installation: the half of the job you never see
What sits under a paver patio, how it is built, what belongs in the written scope, and why two quotes for the same patio can differ.
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Written by HyreYard Research Desk Primary-source research and fact checking
The short answer
A paver patio is four layers, and only the top one is decorative: compacted soil, a compacted gravel base, about 1 inch of bedding sand, then the pavers.
ICPI Tech Spec 2 sets a minimum 4-inch base for patios and walkways on well-drained soil. Sinking, rocking and spreading start in the three layers you cannot see.
What should you know before you price a patio?
ICPI’s minimum is 4 inches for a patio or walkway and 6 inches for a driveway, on well-drained soil.
ICPI: “In colder climates, continually wet or weak soils will require that bases be at least 2 to 4 in. (50 to 100 mm) thicker.”
ICPI: “If there is an uneven base, the bedding sand should not be used to compensate for it. Over time, unevenness in the bedding sand will reflect through to the surface.”
Without a restraint along the edge, the pavers spread outward and the joints open.
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Free, with no obligation: a person at HyreYard replies by email. Matching is not live yet, so this is not a quote. If a tree or limb is on a power line, stay away and call the utility.
What does a failing patio look like?
Each pattern points at a different layer, and the layer tells you whether it is a repair or a rebuild.
The base was compacted unevenly, or dumped in one deep layer instead of several.
Edge restraint missing, too small or never pinned. It starts at the edge and works inward.
Water in the base freezing and thawing. A drainage problem, not a paving one.
Bedding sand has washed out from beneath them, so water is moving under the surface.
An old utility trench, downspout pipe or root channel under the patio that was never compacted.
Not enough fall. Below ICPI’s 1.5% minimum, water sits and then finds the joints.
Efflorescence, a salt deposit carried out by moisture in concrete products. It is cosmetic and can weather off.
Joints never filled or never compacted, so the sand has settled below the paver edge.
Pavers, slab or flagstone: which are you being quoted?
These are different trades with different failure modes, and they get quoted against each other as if they were one job.
| Surface | How it behaves |
|---|---|
| Segmental pavers | Separate units on compacted gravel and bedding sand. The surface flexes a little, and single units can be lifted and reset. The base is everything. |
| Poured concrete slab | One rigid piece with control joints. When it cracks or settles, repairs show. Its base, reinforcement and joint spacing are its equivalent of a base spec. |
| Stone on a mortar bed | Stone set in mortar over a concrete slab. A masonry job that inherits the slab’s problems plus its own. |
| Dry-laid flagstone | Stone on sand or screenings. Fine for a low-traffic garden path, and not something to price as a patio. |
| Permeable pavers | A different system with its own ICPI specification and an open-graded stone base that stores water. Make sure the one quoted is the one built. |
What should a contractor check before quoting?
A quote sent twenty minutes after a phone call was priced from a satellite image. These need a visit.
Where it runs now after rain, and where the finished surface will send it. Away from the house is required.
The free USDA Web Soil Survey shows the mapped drainage class and shrink-swell rating. Swelling clay is covered in expansive soils and hardscape.
A compact loader through a gate is a different job from dozens of wheelbarrow trips.
How much ground has to be cut away or built up. Uncompacted fill under a patio settles on its own schedule.
How close the dig comes to a trunk. Cutting large roots to build a patio can kill a tree slowly.
Digging a patio to base depth produces tons of soil that has to leave the property.
How is a paver patio built?
The first five steps are what you pay for. By the time the pavers go down, the patio’s life is already decided.
Mark the area and the fall, call 811 so buried lines are marked, then dig to base plus sand plus paver. By our addition of ICPI’s figures that is about 7.4 inches on well-drained soil, and more on wet or frozen ground.
The exposed soil is compacted before any stone goes down. ICPI gives 98% of standard Proctor density, ASTM D698 for pedestrian paving.
Dense-graded gravel goes in and is compacted in layers of 4 to 6 inches, never one deep dump. ICPI describes 7,000 lbf (31 kN) reversible plate compactors for this work.
Spread and screeded to about 1 inch, uncompacted, using ASTM C33 or CSA A23.1 FA1 concrete sand. Not masonry sand, screenings or stone dust.
Set on the sand, not pressed into it, to string lines. ICPI distinguishes pedestrian units around 2.375 inches thick from street units around 3.125 inches.
Fixed before the field is compacted. ICPI asks for at least 1 inch of restraint in contact with the side of the paver.
The surface is vibrated with a plate compactor, joint sand is swept in, and it is vibrated again until the joints are full.
How thick should the base be?
ICPI’s published minimums for well-drained soil. They are floors, not targets, and cold or wet ground raises them.
| Use | Compacted base |
|---|---|
| Patio, walkway, pedestrian area | 4 inches. |
| Residential driveway | 6 inches. A car is a different load from a chair. |
| Residential street | 8 to 10 inches, or 6 inches where there is no freeze. |
| Cold or wet ground | 2 to 4 inches thicker, in ICPI’s words for continually wet or weak soils in colder climates. |
Work out the base and paver quantities for your own dimensions with the paver calculator. The full layer-by-layer specification is on the hardscape base specification.
What belongs in the written scope for a patio?
This is the section to print. Two bids that look the same differ here, and none of it can be checked once the pavers are down. Ask for every line in writing before you sign.
In inches, and where the spoil goes.
The method and target. ICPI’s figure for pedestrian paving is 98% of standard Proctor density, ASTM D698.
Compacted inches, placed in lifts of 4 to 6 inches.
ASTM C33 or CSA A23.1 FA1 concrete sand, about 1 inch, uncompacted. Not screenings, stone dust or masonry sand.
The type and how it is fixed, with at least 1 inch against the paver.
As a percentage and a direction. ICPI’s minimum is 1.5%, away from the house.
The joint material, and that the field is compacted after laying.
ICPI: “Frozen or saturated sand should not be installed, and frozen material should not be compacted.”
Where roof water goes once the patio covers the ground it used to soak into.
And the date, so digging waits for the marks.
Call 811 before anyone digs
A patio dig is shallow but wide, and gas, power, water and cable lines can run under a yard.
811 is the free national before-you-dig service. Request marks, and the utilities flag or paint their lines.
Sawing pavers throws dust and chips. Keep children and pets away from the cutting area.
What moves the price of a patio?
Paving is priced on the volume moved and the area covered, and the two do not track each other. A small patio on a steep lot with no machine access can cost more than a large one on flat ground.
| Factor | Why it changes the number |
|---|---|
| Area | Sets the paver and sand quantity directly. |
| Base depth and soil | Going from a 4-inch base to 8 inches on wet clay doubles the base gravel and adds to the digging and hauling. |
| Access | Whether a machine reaches the work. Hand-carrying gravel through a side gate adds labor. |
| Cut and fill | Moving earth to reach the finished grade. Steep lots and raised patios move this a lot. |
| Hauling | Soil and old paving leave by truck, with a dump fee. |
| The pavers | The line you can shop around, and the one with the least effect on how long the patio lasts. |
| Curves and cuts | Every curve is saw work, and a curved patio wastes more material than a rectangle of the same area. |
| Steps and seat walls | Priced separately, as each has its own footing question. |
| Gravel quantity | Loose stone compacts down, so order more than the in-place volume. Ask the supplier how much for that product; the gravel calculator takes their figure. |
HyreYard publishes no national average price for this work. Regional labor, material and disposal rates, access and soil move it far enough that a single figure would mislead.
If the quote names no base depth, it has not priced the patio.
A patio quote with no base depth has priced the pavers, not the patio. One bid may build 4 inches of compacted base on compacted soil; another may lay pavers on two inches of screenings.
You cannot tell them apart in a photo or in the first year. Ask both to write down base depth, compaction and edge restraint, and the gap between them starts to make sense.
What to ask before you sign
In inches, and what that depth is based on.
And to what standard?
Several layers, or one?
Concrete sand, not screenings or stone dust?
And how is it fixed?
As a percentage, and away from the house.
Digging, hauling and gravel, or are any extra?
Settlement specifically, for how long, and what voids it.
What to have ready before a site visit
Where water stands is invisible on a dry day.
Look up your address on the Web Soil Survey and note the drainage class and shrink-swell rating.
A table and six chairs needs more room than people expect. The patio size planner works it out.
Where each one discharges now, because a new patio changes it.
Some lots limit hard surface area, separately from any permit.
The model code exempts “Sidewalks and driveways not more than 30 inches (762 mm) above adjacent grade, and not over any basement or story below and are not part of an accessible route.” Your jurisdiction’s version binds, so ask.
Where do patios go wrong?
The dip filled with sand comes back through the surface. The base has to be flat on its own.
ICPI names them: “Masonry sand for mortar should never be used for bedding, nor should limestone screenings or stone dust.”
Cheap next to the field and invisible, and without it the pavers spread and every joint opens.
Below 1.5%, water sits and then drains into the joints. Toward a foundation it is a drainage defect you paid for.
Gravel compacts from the top. A 4-inch dump compacted once is not a 4-inch compacted base.
A trench, stump hole or built-up slope under the patio has to be compacted in lifts like the rest.
Your inquiry
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Questions
How thick should the base under a patio be?
Why did my pavers sink after two years?
Can pavers be laid on stone dust or screenings?
Do I need a permit for a patio?
How much slope does a patio need?
Are pavers better than a concrete slab?
What is the white haze on my new pavers?
Should I seal a paver patio?
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