Questions?
(800) 524-4161
(800) 524-4161
Road Base Geogrid
SRW · Biaxial · Type 1 & Type 2
Road Base Geogrid
Spread the Load. Save the Base.
Biaxial soil stabilization grid that locks aggregate in place and transfers stress sideways instead of letting it punch down into soft subgrade.
- Two grades, Type 1 and Type 2
- 238 or 352 sq yd per roll
- Free shipping · minimum 1 roll
- 2Grades stocked
- 13ftRoll width
- 352yd²Largest roll coverage
Two Grades
Biaxial Geogrid for Road Base and Subgrade Stabilization
Aggregate on soft ground does not stay put. Under wheel load the stone shifts sideways and punches down into the subgrade, the surface ruts, and you end up adding more rock every season. SRW road base geogrid stops that by interlocking with the aggregate placed over it — the stone keys into the apertures and can no longer move independently, so a loose layer of rock starts behaving like a single stiff slab.
The effect is stress transfer. Load arriving at one point is spread laterally across the reinforced layer instead of concentrating downward, which is what protects a weak subgrade and stops base material shifting. It works on both paved and gravel roadways, and it is what lets you build a working road over soil that would otherwise need excavating and replacing.
Two grades, both 13 feet wide and black, minimum order one roll, free shipping. This is biaxial grid, so it carries load in both directions — but it still has to be rolled out along the line of the road.
Original price
$1,121.09
-
Original price
$1,121.09
Original price
$1,121.09
$1,121.09
-
$1,121.09
Current price
$1,121.09
Road Base Geogrid, Soil Stabilization Grid - Type 1 - 12.9' x 246' Roll
Roadbase Geogrid Mesh, Soil Stabilization Grid 12.9' x 246' Model: GSRW-T1Brand: SRWSize: 12.9' x 246'Square Yards Pe...
View full details
Original price
$1,121.09
-
Original price
$1,121.09
Original price
$1,121.09
$1,121.09
-
$1,121.09
Current price
$1,121.09
Original price
$1,313.72
-
Original price
$1,313.72
Original price
$1,313.72
$1,313.72
-
$1,313.72
Current price
$1,313.72
Road Base Geogrid, Soil Stabilization Grid - Type 2 - 13.1' x 164' Roll
Roadbase Geogrid, Soil Stabilization Grid 13.1' x 164' Model: GSRW-T2Brand: SRWSize: 13.1' x 164'Square Yards Per Rol...
View full details
Original price
$1,313.72
-
Original price
$1,313.72
Original price
$1,313.72
$1,313.72
-
$1,313.72
Current price
$1,313.72
Buyer's Guide
How Soil Stabilization Grid Works
Lay the grid on the prepared subgrade and place aggregate over it. Stone drops partly into the apertures and keys there, so the fill above and below can no longer move independently. That interlock is the whole mechanism — it converts a layer of loose rock into something that behaves like a stiff slab.
Once the layer is stiff, load spreads. A wheel arriving at one spot pushes stress out sideways across the reinforced layer rather than driving it straight down into weak soil. That is why the same road can be built over soft ground with less excavation, less imported rock, and far less rutting over its life.
- Stabilizes road base
- Provides excellent stress transfer
- Prevents deterioration and shifting of base material
- Increases road life span
Type 1 or Type 2
Both are SRW biaxial grid, both 13 feet wide, both black, both minimum one roll. Type 1 gives you the most coverage per roll. Type 2 is the heavier grade in a shorter roll. The tensile and LTDS figures are on the spec sheets below — order to those numbers if your job has an engineered design.
Type 1
Model GSRW-T1
Roll size12.9′ × 246′
Coverage352 sq yd
The larger roll, and the lower cost per square yard of the two. The usual choice where the subgrade is workable and you are covering area.
Shop Type 1
Type 2
Model GSRW-T2
Roll size13.1′ × 164′
Coverage238 sq yd
The heavier grade. Specify it for softer subgrade, heavier axle loads, or where a design calls for the higher strength values.
Shop Type 2
Applications
Sub-grade stabilizationThe core application — a working platform over soil that will not carry load on its own.
Soft soils under embankmentsSpreads embankment load across weak ground instead of concentrating it.
Paved roadwaysProtects the base course so the surface above it lasts its design life.
Gravel roads & drivewaysStops stone migrating into the subgrade, so you stop topping it up every year.
Yards & laydown areasStorage and equipment areas that need to stay level under repeated loading.
Access & haul roadsTemporary and permanent site roads over ground that would otherwise rut out.
Installation
The one thing not to get wrong
This grid is bi-directional, and it must be rolled out in the direction of the road. Running it across the road instead of along it wastes the reinforcement you paid for.
- 1Prepare the subgrade
Grade and clear the area. You do not need a strong subgrade — that is the point of the grid — but you do need it even, and free of anything sharp enough to damage the roll.
- 2Roll out along the road
Unroll in the direction of travel, keeping the grid flat and free of wrinkles. Slack costs you performance, because the grid has to be in tension to transfer stress.
- 3Overlap adjacent rolls
Lap the edges of neighbouring runs so coverage is continuous across the full width of the road. Pin or weight the edges until fill goes on.
- 4Place aggregate over the grid
Spread fill from one side, working forward over placed material rather than driving on bare grid. Build up enough cover before running plant over it.
- 5Compact in lifts
Compact in layers so the stone keys properly into the apertures. Interlock is what stiffens the layer, and it only happens under compaction.
Specifications and Certification
Type 1 specification sheetPDF
Type 2 specification sheetPDF
Type 1 certification letterPDF
Type 2 certification letterPDF
SRW engineers use LTDS calculations to identify and reduce the factors that affect long-term performance of a reinforced system, so the design values on these sheets account for creep, installation damage and durability rather than just ultimate tensile strength.
Reinforcing a Wall Instead?
Road base grid is biaxial — it carries load in both directions, which is what you want under a road where wheels arrive from anywhere. A retaining wall is a different problem: the load path runs one way, back into the retained soil, so wall reinforcement uses uniaxial grid that concentrates its strength on that axis.
Road Base Geogrid FAQs
What does road base geogrid actually do?
Aggregate placed over it keys into the apertures and interlocks, so the layer stiffens and behaves more like a slab than loose stone. Load then transfers sideways across that layer instead of punching down into the subgrade. The result is less rutting, less base movement and a longer road life.
Which way do I roll it out?
In the direction of the road. It is bi-directional grid, but it still has to run along the line of travel rather than across it.
Type 1 or Type 2?
Type 1 covers 352 square yards per roll and is the lower cost per square yard, suiting jobs where the subgrade is workable and you are covering area. Type 2 is the heavier grade at 238 square yards per roll, for softer subgrade, heavier loads or a design that specifies the higher values. Check both spec sheets against your requirement.
How much do I need?
Work out the area of road in square yards and divide by the roll coverage — 352 for Type 1, 238 for Type 2 — then add for the overlaps between adjacent runs. Minimum order is one roll.
Do I still need aggregate?
Yes. The grid does not replace base material, it makes base material work harder — the interlock between stone and apertures is the mechanism. What typically changes is that you need less depth of aggregate for the same performance.
Can I drive on it before covering it?
Avoid it. Place fill from one side and work forward over material already down. Driving or turning directly on exposed grid damages it.
Is this the same as geotextile fabric?
No. Geogrid is an open lattice for reinforcement — it works by interlocking with aggregate. Geotextile is a fabric for separation and filtration. Some jobs use both: fabric to stop fines migrating, grid to stiffen the layer.
Will it work under a gravel driveway?
Yes, and it is one of the more satisfying uses. If you are re-gravelling every year because the stone keeps disappearing into the ground, grid under the base stops the migration and the surface stays where you put it.
Is there volume pricing?
Yes, on geogrid orders totalling over $5,000. Call (800) 524-4161 or request a written quote.
What does shipping cost?
Nothing — shipping is free on every order, on both grades.