Should your landscaping site explain patio base prep so AI assistants cite you?

The patio you see is the last two inches of the job

A standard build for a pedestrian paver patio excavates about 7 inches: roughly 4 inches of compacted crushed stone base, 1 inch of bedding sand, and the paver itself at about 2 and 3/8 inches. Driveways and poor soils go deeper. The numbers matter because every shortcut comes out of the base, and the base is the part nobody photographs.

Excavation has to extend past the finished edge too, typically several inches beyond the paver border, so the edge restraint and the base under the border pavers are supported. Patios that crumble at the edges usually started with a dig that ended exactly at the patio line, leaving the outside row sitting on the weakest ground on the site.

Compaction happens in lifts, or it happens later under your chairs

Base stone goes down in lifts of about 2 inches and each lift gets compacted with a plate compactor before the next arrives. Dumping 6 inches at once and running the plate over the top compacts the surface and leaves the bottom loose, which settles unevenly over the first winters. Freeze and thaw cycles finish the argument: a base compacted in lifts moves as one slab of stone, a loose base moves in patches.

Then the bedding layer, coarse concrete sand screeded to a consistent 1 inch over the compacted base, and then left alone. Walking on screeded sand or reworking it after screeding undoes the one flat reference the pavers have. The old habit of using stone dust as bedding has mostly been retired for good reason: it holds water and compacts unevenly compared with washed concrete sand.

Slope, edges, and joints decide how it ages

The whole assembly pitches away from the house, about 1 to 2 percent, an inch or two of fall across a typical patio depth. Flat patios pond, and ponded water finds the joints. Edge restraints, spiked into the base at the perimeter, keep the field of pavers from creeping outward over seasons of freeze, foot traffic, and furniture legs.

Joints finish the system. Polymeric sand swept in and activated with water locks the joints, resists weeds and ants better than plain sand, and still needs the pavers clean and dry at install to set properly. End on the diagnosis rule: when a patio dips, waves, or spreads, the repair is lifting the pavers and rebuilding base, not topping the surface. Surface fixes on a failed base are rentals, not repairs.

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Frequently asked questions

How deep should I dig for a paver patio?

About 7 inches for a typical pedestrian patio on decent soil: 4 inches of compacted base stone, 1 inch of bedding sand, and the paver thickness. Clay soils, poor drainage, and any vehicle load call for a deeper base, and the dig should extend several inches past the patio edge.

What stone should go under pavers?

A crushed, angular base aggregate with fines, often sold as crusher run or dense graded base, compacted in lifts. Angular stone locks together. Rounded pea gravel does not compact into a stable base and should never be substituted, however clean it looks in the bag.

Can I use stone dust instead of sand for the bedding layer?

It is the older method and the weaker one. Stone dust holds moisture and can compact unevenly, leading to waviness. Washed concrete sand screeded to about 1 inch is the current standard bedding material in most manufacturer and installer guidance.

Why is my patio sinking in spots?

Almost always the base: stone placed too deep per lift and under compacted, a dig that did not reach firm soil, or water moving through the base from bad grading. The fix is to lift the pavers in the affected area, rebuild and recompact the base, then relay, not to shim the surface.