MaterialMath, Calculators for DIY Warriors
Answer · Pavers

Paver patio layers explained: from subgrade to joint sand

Updated April 26, 2026

Quick answer

A paver patio has 5 layers, top to bottom: polymeric joint sand → pavers → 1 in bedding sand → 4–6 in compacted base stone → geotextile fabric → compacted subgrade. Total excavation depth is 7–10 inches below finished grade. Skip any layer and the patio fails within 5 years.
Open the paver calculator →

The 5-layer build, top to bottom

Each layer with depth and purpose
LayerMaterialDepthCost / 100 sqft
1. Joint sandPolymeric sandFills joints$30–$50
2. PaversConcrete or brick1.5–3 in$200–$700
3. Bedding sandCoarse concrete sand1 in (exact)$25–$40
4. Base stone#57 + #8 compacted4–6 in$80–$150
5. GeotextileWoven fabric, $30–$40
SubgradeNative soil compacted, $0 (labor only)

Layer 5, Subgrade prep

Excavate to finished grade depth + paver thickness + bedding + base + 1 in. For 2.375 in pavers with 4 in base, that's 7.4 in below the finished surface. Compact the soil with a vibratory plate compactor in 2-in lifts. Slope away from any structure at 1/4 in per foot for drainage.

Layer 4, Geotextile fabric

Woven landscape fabric goes directly on the compacted subgrade. It prevents the base stone from sinking into the soil and stops weeds from pushing up through joints. Overlap seams by 12 in. This is the cheapest layer ($0.30/sqft) and the one most often skipped, and skipping it is the #1 cause of long-term paver settlement.

Layer 3, Base stone (4–6 in)

Use #57 stone for the bottom 3–4 in (good drainage) and #8 / dense-grade for the top 1–2 in (locks together when compacted). Compact in 2 in lifts with a plate compactor, never dump 6 in and try to compact at once. Final base should be flat enough that a level rests evenly on it.

Base depth by use
Use caseBase depthStone mix
Patio (foot traffic only)4 in3 in #57 + 1 in #8
Walkway4 in3 in #57 + 1 in #8
Driveway (cars)6 in4 in #57 + 2 in #8
Driveway (RV/boat)8 in6 in #57 + 2 in #8
Cold climate (deep frost)+2 inAdd to base, not bedding

Layer 2, Bedding sand (exactly 1 in)

Coarse concrete sand (NOT mason sand, NOT play sand) screeded to exactly 1 inch deep. Less than 1 in and pavers don't seat properly; more than 1 in and pavers shift under load. Screed with two 1-in PVC pipes as guides and a 2×4 between them. Do not compact the bedding sand before laying pavers.

Layer 1, Pavers

Set pavers tight against each other with a small (1/8 in) joint. Tap each one level with a rubber mallet. After all pavers are set, run the plate compactor over them WITH a rubber pad attachment to seat them into the bedding sand without chipping.

Layer 0, Polymeric joint sand

Sweep dry polymeric sand into the joints, vibrate with the plate compactor (rubber pad), top off any low joints, then mist with water in 3 light passes. The polymer binds the sand into a flexible weed- and ant-resistant joint. See the full polymeric sand coverage guide for bag counts.

Formula

Total excavation depth

excavation_depth = paver_thickness + 1 in (bedding) + base_depth

Standard patio (2.375 in pavers + 4 in base):
  2.375 + 1 + 4 = 7.375 in

Driveway (2.375 in pavers + 6 in base):
  2.375 + 1 + 6 = 9.375 in

Cold climate driveway (2.375 in + 8 in):
  2.375 + 1 + 8 = 11.375 in

Add 1 in to all numbers if you want pavers slightly above grade.
Most homeowners under-excavate by 2–3 inches because the math seems excessive for a patio. Don't. The base depth is what carries the load and prevents settling, saving 2 in of digging now means re-doing the entire patio in 5 years.

Worked example

14 × 16 ft patio (224 sqft), full materials list

Standard backyard patio, 2.375 in concrete pavers.

  1. 1. Excavation: 224 sqft × 7.5 in deep5.2 cu yd of soil out
  2. 2. Geotextile fabric224 sqft @ $0.30 = $67
  3. 3. Base stone: 4 in compacted224 × 4/12 / 27 × 1.15 = 3.2 yd
  4. 4. Bedding sand: 1 in224 × 1/12 / 27 = 0.7 yd
  5. 5. Pavers (12×12, +10% waste)246 pavers
  6. 6. Polymeric sand5–6 bags

→ $1,400–$2,200 in materials. Plan 3 weekends of work.

Common mistakes (and how to avoid them)

✗ Skipping the geotextile fabric to save $60.

Fix: Without fabric, base stone migrates into the soil over years. By year 5 the base is 2 in instead of 4 in and pavers start settling. Always install fabric, it's the cheapest insurance you'll buy on this project.

✗ Using mason sand or play sand for the bedding layer.

Fix: Bedding sand MUST be coarse concrete sand (washed concrete sand, ASTM C33). Fine sands wash out from under pavers, leaving voids that cause sinking and rocking.

✗ Compacting the bedding sand before laying pavers.

Fix: Bedding sand stays loose under pavers, it's what lets you tap each paver level. Compacting it makes the pavers ride too high and they won't bed in evenly.

✗ Skipping edge restraint at the perimeter.

Fix: Without plastic or metal edging at the patio edges, pavers spread outward over time and joints open up. Use spike-down restraint along every unbordered edge.

→ Calculate pavers, base, sand, and edging

Frequently asked questions

How many layers does a paver patio have?
Five: polymeric joint sand, pavers, 1 in bedding sand, 4–6 in compacted base stone, and geotextile fabric on the subgrade.
How deep do you dig for a paver patio?
7–8 inches for a standard patio (2.375 in pavers + 1 in bedding + 4 in base). 9–10 in for a driveway. Add 2 in for cold-climate frost depth.
What goes under a paver patio?
From bottom to top: compacted soil, geotextile fabric, 4–6 in compacted base stone (#57 + #8), then 1 in screed-flat bedding sand. Pavers go on top of the bedding sand.
Do I really need geotextile fabric?
Yes. It costs $0.30/sqft and prevents the base stone from sinking into the soil over time. Skipping it is the #1 cause of paver settlement in year 5+.
Can I use any sand under pavers?
No, must be coarse concrete sand (ASTM C33). Mason sand and play sand are too fine and wash out from under pavers, causing them to sink and rock.
How long does a properly built paver patio last?
25+ years with annual joint-sand refresh and proper drainage. The 5-layer build is the difference between 25 years and 5 years of life.
More from MaterialMath

Related answers & calculators

Paver calculator

Pavers, base, sand, and edging counts.

Open

Paver sizing guide

Pattern options from 6×6 to 24×24.

Open

Paver base depth guide

Full base spec by use case.

Open

How many pavers?

Coverage by size and pattern.

Open

Polymeric sand coverage

Joint sand bag counts.

Open

Gravel calculator

Tons of base stone for the bottom layer.

Open