Paver base depth on sandy Florida soil

Two CMHA documents, two ways of stating thickness

Tech Note PAV-TEC-002, Construction of Interlocking Concrete Pavements, says the base thickness depends on traffic, soil type, subgrade drainage and moisture, and climate. Sidewalks, patios, and pedestrian areas should have a minimum base thickness after compaction of 4 inches (100 mm) over well-drained soils. Residential driveways on well-drained soils should be at least 6 inches (150 mm) thick. The same note says colder climates and continually wet or weak soils require thicker bases. A later sentence in a distributor copy of that spec puts the added thickness at 2 to 4 inches for those wet or weak conditions. The CMHA web text we read says the bases must be thicker and does not repeat the 2-to-4-inch adder on the summary page, so this site will not treat 8 or 10 inches as a published Myakka design.

Tech Spec 10, the 2022 application guide, states minimum aggregate base thickness as a range: walks 4 to 6 inches, driveways 6 to 8 inches, and streets 8 to 12 inches. It says thicknesses may be greater depending on site conditions, freezing temperatures, and traffic, and that a qualified design professional should review them. Use the 4-inch and 6-inch figures as the well-drained minimums in PAV-TEC-002. Use the 6-to-8-inch driveway range when you are quoting Tech Spec 10. Do not average them into a pretend Volusia ordinance.

Why Myakka is not the well-drained example

The USDA official series description for Myakka says these soils are poorly or very poorly drained sands. The water table is at depths of less than 18 inches for 1 to 4 months in most years and drops below 40 inches in very dry seasons. That is the flatwoods soil people mean when they say Florida sand holds water. Tavares soils, on higher ground, are the better-drained comparison in that same description. Deltona and DeLand have more of the higher ground. Canal lots, the barrier island, and low yards near swales have more of the wet kind. Your excavation is the test. If it fills with water, you are outside the sentence that says well-drained.

Port Orange publishes a local illustration for the public apron, not a countywide base law. Limerock or crushed concrete is allowed there only where the subgrade is at least 6 inches above the seasonal high water table. Below that, the city calls for soil cement, or concrete regardless of the water table. Read the Port Orange driveway page and the permit row before you copy a 6-inch limerock note onto a private patio in another city. The question to ask anywhere in the county is the same shape: what base is the installer using if the bottom of the hole is wet?

Fabric, compaction, edges, and the paver itself

PAV-TEC-002 says geotextile may be used where soil remains saturated part of the year, where there is freeze and thaw, or over clay and moist silty subgrade. As a separation layer it keeps soil from pumping into the aggregate under load. Freeze-thaw is not the usual Volusia failure. Saturation is. The note does not say every sandy lot must have fabric. It says fabric is a tool for the saturated case, which is the case Myakka describes for part of the year. Ask the installer to say yes or no, and why.

Compaction in that note: bases for pedestrian areas and residential driveways should be compacted to a minimum 98 percent of standard Proctor density. For vehicular areas, compaction should be at least 98 percent of modified Proctor density under ASTM D1557. A residential driveway is named in the standard Proctor sentence. Constant vehicular traffic is named for modified Proctor. Do not collapse those into one test name on the quote. Tech Spec 10 repeats the same split and points at ASTM D698 for the standard Proctor case. The highest compaction may not be achievable on weak or saturated soils. That limit is in the note. It is a reason to stabilize or drain the subgrade, not a reason to skip the test.

Edge restraint needs at least 1 inch of vertical face against the side of the paver. Aluminum, steel, plastic, or concrete are the materials the note lists. Bedding sand should meet ASTM C33 concrete sand. Masonry sand, limestone screenings, and stone dust are named as materials not to use for bedding, because they do not compact uniformly and can slow drainage. Paver thickness in the same note: units 2 3/8 inches (60 mm) thick for pedestrian areas, driveways, and limited vehicular use. Streets and industrial pavements should use units at least 3 1/8 inches (80 mm) thick. Slope for the excavation layout is a minimum of 1.5 percent. Herringbone is recommended for street applications because of braking and turning. The note does not say a backyard patio must be herringbone.

What a quote should list before you compare price

Angi's 2026 standard driveway band is $10 to $18 per sq ft, about $6,000 to $10,800 for 600 square feet, before haul-away. A thin base can sit inside a low bid and still miss the CMHA minimum for a well-drained lot, which a wet lot should beat rather than match. Open the calculator so both bidders use one area, then the quote comparison guide for the line items. If the field has already sunk, new joint sand will not lift it. That is the sinking pavers page.

1. Ask for compacted base thickness, and whether they are quoting the well-drained minimum or something thicker.
2. Ask which Proctor test they mean, standard or modified, and whether anyone will measure density.
3. Ask if geotextile is in the price when the subgrade stays wet.
4. Confirm bedding sand is concrete sand at about 1 inch, not a filler for a bad base.
5. Confirm edge restraint and a slope. PAV-TEC-002 uses 1.5 percent as the layout minimum.
6. If the apron is in a city street, open that city's permit row before you treat the private-side base as the apron base.

What this page will not guess

Last checked November 1, 2026. We did not find a Volusia County ordinance that sets one base thickness for every residential paver driveway. We are not publishing 8 inches, 10 inches, or 12 inches as the Myakka number. PAV-TEC-002 tells you the well-drained minimum and tells you wet soils need more. It does not hand you the extra inches for your lot. A civil engineer, or the installer willing to describe the wet hole, does that. We also did not convert the 1.5 percent slope into a local drainage-plan approval. Ormond Beach's 1,000-square-foot drainage trigger is a city checklist, linked from the permit guide, not a base-thickness rule.