---
title: Base, Sub-Base, and Subgrade Stabilization | TerraValor Solutions
description: "Stabilization beneath the wearing course: a hydrophobic, semi-permeable reinforced layer designed to support road longevity and add tensile strength to unbound soil."
image: https://www.terravalor-solutions.com/hs-fs/hubfs/terravalor-og.jpg
---

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[Products](https://www.terravalor-solutions.com/#products) / Base, Sub-Base, and Subgrade Stabilization

# Base, Sub-Base, and Subgrade Stabilization

Support road longevity from the layers beneath the surface. TerraValor’s stabilization approach is designed to create a hydrophobic, semi-permeable reinforced layer below the wearing course, adding tensile-strength properties to otherwise unbound soil and aggregate.

[Discuss Your Road Project](https://www.terravalor-solutions.com/demo?hsLang=en)[Explore the Layer Design](https://www.terravalor-solutions.com/stabilized-aggregate-roads/base-sub-base-subgrade-stabilization#layer-design)

## A stronger foundation beneath the wearing course.

The wearing course is the surface exposed to traffic. Stabilizing the supporting layers is intended to improve their integrity and help limit the movement and moisture-related deterioration that can shorten a road’s service life.

1. **Wearing course**The traffic-bearing surface above the stabilized foundation.
2. **Base**The layer immediately below the wearing course, supporting the surface and distributing loads.
3. **Sub-base**An additional supporting layer where specified in the pavement design.
4. **Subgrade**The underlying soil foundation, which may be stabilized where appropriate for the design.

Illustrative layers only—not a construction specification. A project may call for treatment of the base, sub-base, subgrade, or a selected combination. Layer thicknesses, treatment rates, drainage, and material suitability require site-specific design.

## Designed to address what happens below the surface.

### Hydrophobic, yet semi-permeable

The intended layer repels water while retaining some permeability. It is not an impermeable liner and does not replace a properly designed drainage system.

### Freeze–thaw resistance

Designed to resist freeze–thaw-related deterioration by improving the treated layer’s integrity and response to moisture. Performance depends on the material, climate, and drainage.

### Vibration and subsurface erosion

Reinforcement is intended to resist particle movement from traffic-induced vibration and reduce loss of supporting material through subsurface erosion.

### Tensile-strength properties

Polymer treatment is intended to add binding and tensile-strength properties to otherwise unbound soil and aggregate, helping the layer act as a reinforced foundation.

## Start with the material and pavement design.

Discuss existing soil and aggregate, moisture conditions, traffic loading, the proposed wearing course, and the layer you intend to treat. Material evaluation and appropriate testing should inform the treatment and construction approach.

These are intended performance benefits, not guaranteed service-life extensions. Available indirect tensile laboratory findings apply to their tested materials and methods; they do not independently establish freeze–thaw, vibration, permeability, or long-term performance for every road design.

![Road roller and field demonstration equipment on an aggregate surface](https://www.terravalor-solutions.com/hubfs/TerraValor/Website/TerraValor-Roller-Demo.png)

See the application process firsthand.

## Request a Demo

Tell us about your road project and the layer you want to stabilize. Talk with TerraValor about a demonstration for your site.

[Request a Demo](https://www.terravalor-solutions.com/demo?hsLang=en)[Review the Research](https://www.terravalor-solutions.com/research?hsLang=en)[Talk With TerraValor](https://www.terravalor-solutions.com/contact?hsLang=en)

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The authorized T-PRO® distributor and on-the-ground applicator — serving energy, data centers, mining, municipal, DoD, and industrial markets with carbon-neutral polymer soil stabilization.

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© 2025 TerraValor Solutions LLC. All rights reserved. Based in Austin, TX.

T-PRO® is a registered trademark of [Lithic Industries](https://lithicindustries.com). TerraValor Solutions is an authorized distributor and applicator.

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