Polymeric Sand Store
Geogrid & Wall Drainage
5 products · Geogrid and retaining wall drainage.
Geogrid
SRW Products
SRW 5 Series Retaining Wall Geogrid, Uni-Directional
Regular priceFrom $203.99Unit priceIn stock- Long-term design strength (LTDS) of 2,064 lb/ft.
- Uni-directional: install with the roll direction running back from the wall face.
- Transfers load from the wall face into the compacted soil mass.
- Helps prevent bulging, leaning and wall failure as walls get taller.
Geogrid
SRW Products
SRW 3 Series Retaining Wall Geogrid, Bi-Directional
Regular priceFrom $83.99Unit priceIn stock- Long-term design strength (LTDS) of 1,161 lb/ft.
- Bi-directional: same strength both roll directions, so layout is forgiving.
- Transfers load from the wall face into the compacted soil mass.
- Helps prevent bulging, leaning and wall failure as walls get taller.
Sold outGeogrid
Alliance
Alliance Gator Grid 30-30 Biaxial Geogrid
Regular priceFrom $101.99Unit price- 2,052 lbf per ft (30 kN/m) ultimate tensile, ASTM D6637, in both directions. Biaxial...
- High-molecular-weight, high-tenacity polyester yarns woven in tension and PVC coated.
- No memory. Alliance rates it to lie 100 percent flat when unrolled, so it...
- Medium-height retaining walls, raised patio and staircase internal structure.
Drainage
SRW Products
SRW Wall Drain Pro Retaining Wall Drain
Regular priceFrom $24.99Unit priceIn stock- No round cuts: a simple plunge cut fits the drain.
- Back end snaps into standard 4 in drain tile.
- Black, tan and gray to match the block.
- For block or timber walls, 4 to 8 in course heights.
Geogrid
SRW Products
SRW Universal Geogrid for Retaining Walls
Regular priceFrom $79.99Unit priceIn stock- Long-term design strength (LTDS) of 688 lb/ft, for walls up to 6 ft.
- Bi-directional strength: usable in either roll direction.
- The practical choice for residential walls and terraces.
- Transfers load from the wall face into the compacted soil mass.
About geogrid & wall drainage
Geogrid and retaining wall drainage. Geogrid reinforces the soil behind a segmental retaining wall so the wall and the earth act as one mass rather than the blocks resisting the load alone. Above roughly 3 to 4 feet, most block manufacturers require it, and most engineered designs specify it.
Read the full guide
Geogrid Basics
- Biaxial grid has similar strength in both directions, used for base stabilization over soft soil
- Uniaxial grid is far stronger in one direction, used for wall reinforcement running back into the fill
- Layer spacing and embedment length come from the wall design, not from a rule of thumb
- Grid must be pulled taut and covered with compacted fill, slack grid does nothing
Drainage Is What Actually Fails Walls
Most retaining wall failures are water failures, not block failures. Water builds up behind the wall, hydrostatic pressure develops, and the wall pushes out. Drainage aggregate, a drain pipe and non woven fabric that lets water through are what prevent that.
- Use non woven fabric behind walls, not woven weed barrier
- Woven fabric slows drainage and makes the problem worse
- Drain to daylight wherever possible
- See landscape and drainage fabric for the full range
When to Get an Engineer
Walls above about 4 feet, walls with a slope or structure above them, and walls holding back a driveway generally need an engineered design. Geogrid layout is part of that design. If you are unsure, that is the point to ask rather than guess.