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Road Base Geogrid
Biaxial Geogrid · Type 1 & Type 2
Road Base Geogrid
Spread the Load. Save the Base.
Biaxial soil stabilization geogrid providing aperture interlock and lateral restraint of the granular layer, distributing wheel loads over a wider area of subgrade.
- Two grades: Type 1 and Type 2
- 235 or 352 sq yd per roll
- Subgrade stabilization and base reinforcement
- Free shipping on all orders
- 2Grades available
- 12.9ftRoll width
- 352yd²Largest roll coverage
Two Grades
Biaxial Geogrid for Road Base and Subgrade Stabilization
Unconfined aggregate over a low-bearing subgrade fails two ways at once: particles displace laterally out of the load path, and the interface breaks down as fines migrate up and stone punches down. The section thins and ruts.
Biaxial geogrid resists both through aperture interlock. Aggregate compacted into the apertures keys against the ribs, so particle movement mobilizes the tensile resistance of the grid rather than displacing freely. The confined layer acts as a semi-rigid composite, widening the load-spread angle and lowering bearing pressure on weak soils. On low-CBR subgrades this allows a reduced aggregate thickness for equivalent performance.
Both grades carry tensile capacity in the machine and cross-machine directions, suiting multidirectional loading. Rolls are 12.9 feet wide and deployed along the roadway alignment. Specify Type 1 for continuous runs, Type 2 for access drives and repairs.
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
Road Base Geogrid · Type 1 · 12.9' × 246' Type 1 road base geogrid is a biaxial stabilization grid that locks aggregate into pla...
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 - 12.9 x 164' Roll
Road Base Geogrid · Type 2 · 12.9' × 164' Type 2 road base geogrid is a biaxial stabilization grid that locks aggregate into pla...
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.
- Stabilizes road base
- Provides excellent stress transfer
- Prevents deterioration and shifting of base material
- Reduces rutting and base movement under load
Type 1 or Type 2
Both grades are biaxial, 12.9 feet wide, and black. 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
Biaxial grade
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
Biaxial grade
Roll size12.9′ × 164′
Coverage235 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
- 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
This grid is bi-directional, but it must still be unrolled in the direction of the road rather than across it. Keep 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 neighboring 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 layers
Compact in shallow 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
Design values on these sheets are derived using LTDS calculations, so they account for creep, installation damage and durability rather than ultimate tensile strength alone.
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 and less base movement.
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 235 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, 235 for Type 2 — then add for the overlaps between adjacent runs.
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-graveling 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. For larger quantities, request a written quote and we will come back with volume pricing.
What does shipping cost?
Nothing — shipping is free on every order, on both grades.