What Goes Under Pavers? Base, Sand & Depth Guide for Officer VIC

A paving project can look perfect on installation day and still develop problems later if the layers underneath are wrong. Uneven pavers, rocking edges, low spots, water pooling and sections that gradually sink are often connected to the preparation below the visible surface. So, what goes under pavers? For a typical flexible paving installation, the basic build-up is:

The exact paver base depth, bedding thickness and construction method depend on the site, soil conditions, intended traffic and the paver manufacturer's specifications. For homeowners around Officer, Pakenham, Berwick and surrounding South East Melbourne suburbs, understanding these layers before ordering material can save both time and money. Officer Garden Supplies supplies sand, gravel and crushed rock and other landscaping supplies in Officer VIC for paving, landscaping, driveway and outdoor projects.

1. Start With the Subgrade

The first layer is not purchased from a landscape yard. It is the existing ground underneath the paving. This is called the subgrade. Before adding road base, remove vegetation, loose soil, roots, organic material and unstable material from the area. The subgrade needs to be reasonably stable and appropriately prepared because every other paving layer sits above it. Putting expensive pavers over unstable ground does not solve a foundation problem. If the underlying ground moves significantly, the movement may eventually show at the finished paving surface. This is why proper site preparation matters before asking how much sand or crushed rock to order.

2. Do You Need Geotextile Fabric Under Pavers?

Sometimes. Geotextile or separation fabric can be useful where weak, soft or problematic subgrade conditions could allow the granular base to mix with the soil underneath. But it should not automatically be treated as a compulsory layer for every backyard paving project. Whether it is needed depends on:

• Ground conditions
• Soil type
• Drainage
• Intended load
• Base design
• Manufacturer or engineer requirements

For difficult sites, expansive or poorly drained soils, or paving carrying substantial vehicle loads, professional advice may be more appropriate than relying on a generic DIY specification.

3. What Is the Best Base Material Under Pavers?

The structural layer under most flexible paving systems is a compactable granular material such as road base under pavers or suitable crushed rock under pavers. This layer matters because the bedding sand is not supposed to compensate for an unstable foundation. The base needs to create a firm, uniform platform before the sand is screeded. Officer Garden Supplies stocks gravel and aggregate products suitable for landscaping and base-preparation applications. You can explore the gravel and crushed rock range before ordering. For a more detailed comparison between materials, read: Crushed Rock vs Gravel vs Toppings: Best Material for Driveways and Paths

Why Crushed Rock Works as a Paver Base

A suitable crushed-rock or road-base product contains particles that can compact together to form a stable foundation. That makes it different from loose decorative gravel. Decorative gravel may be useful for drainage or as a finished landscape surface, but it is not automatically the right structural paver base material. The key requirement is that the selected base material is suitable for compaction and the intended project load.

4. How Deep Should the Paver Base Be?

This is one of the most searched questions around paving, and it is also where oversimplified advice creates problems. There is no single paver base depth that suits every project. A garden path carrying foot traffic does not have the same structural requirement as a driveway carrying vehicles. For one flexible-installation system, Adbri Masonry specifies the following:

The same guidance recommends building up deeper bases in compacted layers rather than placing a thick loose layer and compacting only the surface. Again, use these figures as a guide. The correct specification can change depending on the paver product, soil, drainage, traffic and site conditions.

5. How Deep Do You Need to Excavate for Pavers?

When people search how deep to excavate for pavers, they often calculate only the paver thickness. That is a mistake. You need space for the complete paving build-up. A simple excavation calculation is: Compacted Base Depth + Bedding Sand Depth + Paver Thickness = Approximate Excavation Depth For example, if a pedestrian project uses:

The example gives an approximate starting excavation depth of 140 mm, before accounting for site-specific levels, drainage falls and preparation. Always work backwards from the required finished paving height. That matters around doors, garages, paths, drains and existing structures.

6. What Sand Should You Use Under Pavers?

The next layer is the bedding sand. People commonly search both what sand to use under pavers and how much sand under pavers, but the type of sand matters just as much as the quantity. A suitable coarse, clean paving or bedding sand is commonly used above the compacted base. The bedding layer helps create the final level surface onto which the pavers are laid. You can review the sand supplies available in Officer when planning your paving project.

Bedding Sand Is Not the Structural Base

This distinction is important. Bedding sand for pavers is designed to create a workable, even laying bed. It should not be used to compensate for large level differences in a poorly prepared base. If one side needs substantially more sand than another because the base is uneven, the base should usually be corrected first. A thick and inconsistent bedding layer can increase the chance of uneven settlement.

7. How Much Sand Should Go Under Pavers?

Australian manufacturer guidance commonly keeps the bedding layer relatively thin. Adbri's flexible paving installation guidance uses approximately 20–25 mm of coarse bedding sand over the compacted granular base. Other individual paving systems may specify slightly different requirements. So instead of automatically following a generic online answer of 30, 40 or 50 mm, check the specification for the paver you are actually installing. The important principle is simple: Build strength in the base, not by adding extra bedding sand.

8. Can You Lay Pavers on Sand Only?

For a permanent outdoor patio, pathway or driveway built over normal ground, laying pavers directly over a thick layer of sand without a suitable prepared base is generally not the preferred flexible-paving construction method. This is why the search can you lay pavers on sand only needs context. A compacted granular base helps distribute loads and creates a more stable foundation. Sand provides the bedding layer. They perform different jobs. There are exceptions, including particular ground conditions, specialist systems, existing concrete slabs and manufacturer-approved installation methods. Do not assume one paving method applies to every project.

9. How Should Road Base Be Compacted?

Buying the right road base under pavers is only part of the job. It also needs to be compacted properly. For deeper build-ups, the material should normally be placed and compacted progressively rather than dumped at full depth and compacted only from the top. Adbri's installation guidance recommends compacting built-up granular base in approximately 75 mm layers. A plate compactor is commonly used for this stage. The goal is a firm, even base with the required levels and fall established before bedding sand is added.

10. Do Pavers Need Drainage and Fall?

Yes. Drainage should be considered before the first paver is laid. A flat-looking patio still needs to manage rainwater. Adbri's paving guidance stresses the importance of drainage and specifies a minimum gradient in its installation system. For properties within Cardinia Shire, drainage matters beyond the paving surface itself. Cardinia Shire Council states that property owners are responsible for managing stormwater runoff from their land, including water associated with driveways and paths, until it reaches the appropriate drainage system. If your paving project changes existing drainage, creates runoff toward neighbouring properties, affects a crossover or connects to council drainage, check the relevant local requirements before construction. This is particularly important for larger driveways and hard-surface projects.

11. Why Edge Restraints Matter

The centre of a paved area receives most of the attention, but the perimeter matters too. Pavers near an unsupported edge can gradually move sideways. That movement can open joints and affect alignment. Suitable edge restraints help contain the paving system. Depending on the project, edging might involve a concrete or sand-and-cement haunch, a restrained border course or another approved edging system. If cement products are required for your landscaping or paving work, you can also browse the Officer Garden Supplies product range.

12. What Goes Between Pavers?

The sand under the pavers and the sand in the joints perform different jobs. After the pavers are laid, suitable jointing sand is swept into the joints. Joint filling helps create interlock between individual units and reduces unwanted movement. Do not automatically assume that every bedding-sand product is also the ideal jointing material. Follow the paving manufacturer's requirements for joint width and joint-filling material.

13. Paver Base for a Patio vs Paver Base for a Driveway

The search terms paver base for patio and paver base for driveway should not lead to identical advice. A patio or garden path generally carries people, outdoor furniture and relatively light loads. A driveway repeatedly carries vehicle loads. That difference affects:

Adbri's flexible installation guidance specifies a substantially deeper compacted granular base for driveway paving than for pedestrian paving. If you are building a driveway, check both the base specification and whether the selected pavers are rated for driveway use.

14. How Much Road Base and Sand Do You Need?

For bulk landscaping materials, calculate volume in cubic metres. The basic formula is: Length × Width × Depth = Cubic Metres Depth must be converted from millimetres to metres. For example, a 20 m² pedestrian paving area using a 75 mm compacted base has a theoretical compacted volume of: 20 × 0.075 = 1.5 m³ A 25 mm bedding layer over the same area has a theoretical volume of: 20 × 0.025 = 0.5 m³ However, ordering quantities for compactable material are not always identical to the final compacted volume. Compaction, site levels, wastage and irregular areas can change the required quantity. Use the Officer Garden Supplies Volume Calculator to estimate your project volume and speak with the supplier before ordering a large bulk load. For more detail, read: How Much Mulch, Soil, Gravel or Sand Do I Need? A Cubic Metre Guide

15. Common Paving Base Mistakes

16. What About Pavers Over Existing Concrete?

Pavers can sometimes be installed over an existing concrete slab, but that is a different construction system from flexible paving over compacted road base. The existing concrete needs to be suitable for the proposed installation and drainage needs to be carefully considered. Do not simply put bedding sand over a damaged concrete slab and expect it to solve existing movement or drainage problems. For pavers installed over concrete, follow the specific paver manufacturer's rigid-installation guidance or seek professional advice.

17. What About Permeable Pavers?

Permeable paving is another separate system. It is specifically designed to allow water to move through the paved surface and supporting layers. The base materials and construction details for a permeable pavement can be different from conventional paving. The Concrete Masonry Association of Australia provides dedicated technical guidance for segmental and permeable paving systems. If you are installing permeable paving, use the system specification rather than applying a standard patio build-up.

18. Planning a Paving Project in Officer VIC?

Before you order materials, work out: What the paved area will be used for, the total square metres, the required finished level, the paver thickness, the manufacturer's recommended base, bedding-sand depth, drainage requirements and site access for material delivery. Officer Garden Supplies is located at 405 Princes Highway, Officer VIC 3809 and supplies landscaping materials for residential, DIY and trade projects. You can explore: Sand Supplies in Officer Gravel & Crushed Rock All Garden & Landscaping Supplies Bulk Landscaping Materials Volume Calculator Complete Landscaping Supplies Checklist for Officer VIC

Paving Material Checklist

Before beginning a typical flexible paving project, confirm the required subgrade preparation, compactable crushed rock or road base, paving/bedding sand, pavers, jointing sand, edge-restraint materials, drainage requirements and the equipment required for excavation, screeding and compaction. The exact specification should always be matched to the site and paving system.