Patio Paver Installation: Layout, Base Prep, Leveling, and Edge Restraint

Planning and Layout

Mark the patio outline with landscape marking paint or garden hoses. Add 6-8 inches beyond the finished patio edge for the excavation — you need room for edge restraints.

Plan the drainage slope. The patio should slope away from the house at 1/8 to 1/4 inch per foot. For a 10-foot wide patio, that is 1.25 to 2.5 inches of drop from the house side to the far edge.

Choose a paver pattern before excavating. Running bond (brick pattern) is simplest and wastes the least material. Herringbone is the strongest for areas that get vehicle traffic. Basket weave and circular patterns look elegant but require more cutting.

Calculate materials: measure the area in square feet, add 10% for cuts and waste. Pavers are sold by the square foot or by the pallet. Gravel base: plan for 4-6 inches of compacted depth across the full area. Sand bedding: 1 inch of screeded sand over the compacted base.

Excavation

Excavate to the depth of the paver plus 6-7 inches for the base and bedding layer. For a standard 2-3/8 inch paver: 2.375 + 4 (gravel minimum) + 1 (sand) = 7.375 inches. Dig 8 inches to be safe.

The excavated surface should be roughly shaped to the final drainage slope. Compact the subsoil with a plate compactor. Soft or disturbed subsoil needs extra compaction or additional gravel depth.

Check for tree roots. Large roots under the patio will heave the pavers as they grow. Either route around the tree's root zone or accept that the patio may shift in that area over time. Do not cut major roots — it can destabilize the tree.

Gravel Base

Use 3/4-inch crushed stone (also called road base, process gravel, or Class II base). Not round pea gravel — round stones do not compact and lock together.

Spread gravel in 2-inch lifts, compacting each lift with a plate compactor. Two passes in perpendicular directions per lift. Four inches total (two lifts) is minimum. Six inches is better for heavy clay soil or areas with freeze-thaw.

Check grade and slope after each compaction pass. Use a string line and a line level across the full area. Adjust high and low spots before adding the next lift.

The compacted base should be firm enough that you can walk on it without leaving footprints. If you sink in, the compaction is insufficient or the material is too wet. Let it dry and compact again.

Sand Bedding and Screeding

Lay two pieces of 1-inch diameter pipe or conduit on the compacted base, parallel, about 6 feet apart. These are your screed guides.

Spread coarse concrete sand (not play sand or mason sand) between the pipes to about 1.5 inches deep. Pull a straight 2x4 across the pipes to level the sand to exactly 1 inch. This is screeding. The pipes set the depth; the 2x4 sets the surface flat.

Remove the pipes, fill the grooves with sand, and smooth them by hand. Do not compact the sand — the pavers compact into it when you run the plate compactor over the finished surface.

Only screed as much area as you can pave in a few hours. Walking on the screeded sand surface disturbs it. Work in sections if the patio is large.

Laying Pavers

Start from a straight edge (the house foundation, a string line, or the first edge restraint). Place pavers onto the sand surface without sliding them — set each one straight down to avoid disturbing the sand bed.

Maintain consistent joints between pavers. Most interlocking pavers have built-in spacing nibs. For pavers without nibs, use 1/8-inch spacers.

Cut pavers with a masonry saw (wet saw for clean cuts) or a diamond blade on a circular saw. A guillotine-style paver splitter makes fast rough cuts for edges. Measure and cut as you go — trying to cut all edge pieces at once leads to compounding measurement errors.

Check alignment every few rows with a string line. A small error in the first row becomes a large error by the tenth row.

Edge Restraint and Finishing

Edge restraint holds the pavers in place and prevents them from migrating outward over time. Without it, the outer pavers creep out and joints open up.

Plastic paver edging (Snap-Edge, Pave Tech) stakes into the compacted base along the patio perimeter. Drive 10-inch landscape spikes through the edging holes every 12 inches. The edging must be installed before the final compaction.

Run the plate compactor over the entire paver surface. This settles the pavers into the sand bed and locks them together. Use a rubber pad on the compactor plate to prevent scratching the paver faces.

Sweep polymeric sand into the joints. This sand contains a polymer that activates with water, binding the sand and locking the pavers together. Sweep in multiple directions to fill all joints. Mist with water per the product instructions. Do not flood — too much water washes the polymer out of the joints before it sets.

Tools for Paver Installation

Plate compactor (rent — $60-80 per day). Wheelbarrow and flat shovel for moving gravel and sand. Screed pipes (1-inch conduit) and a straight 2x4. String line and stakes. Level. Tape measure. Rubber mallet for adjusting paver position. Masonry saw or diamond blade for cuts. Broom for sweeping sand into joints.

For excavation: a mattock and flat shovel for hand digging, or rent a mini excavator for patios over 200 square feet. The excavation is the most physically demanding part of the project.

Frequently Asked Questions