Polystorm R PSM1A 190L Storm Soakaway Crate

The Polypipe Polystorm R PSM1A is a heavy duty modular soakaway crate designed for surface water attenuation, retention and infiltration within SuDS compliant drainage systems. It is manufactured from over 90 percent recycled polypropylene and provides a 95 percent void ratio, allowing efficient water storage while reducing excavation volume.

This crate is suitable for both domestic and commercial projects where higher load performance or deeper burial is required. Typical uses include soakaways beneath driveways, car parks, access roads, service yards and landscaped areas, as well as attenuation tanks serving roofs and paved surfaces.

The Polystorm R unit provides a vertical compressive strength of up to 610 kN per square metre (61 tonnes per square metre), making it suitable for trafficked applications when installed with the correct cover depth and backfill. It can be buried to depths of up to 3.7 m depending on soil conditions and groundwater levels.

For infiltration systems, the crate should be fully wrapped in a permeable non woven geotextile membrane to prevent fines migration while allowing controlled discharge into the surrounding ground. For attenuation or retention systems, an impermeable geomembrane should be used, protected by a suitable non woven fleece.

The modular design allows crates to be stacked and clipped together to form tanks of almost any shape. Polystorm R can also be used as part of a hybrid system alongside Polystorm or Polystorm Xtra crates to optimise cost and load performance on larger schemes.

Limitations should be considered early. In weak clay soils or high groundwater conditions, maximum burial depths may be reduced and infiltration performance may be limited. Ground conditions should always be assessed before specifying the system.

• Suitable for trafficked and deeper burial soakaway systems
• High void ratio for efficient water storage with reduced excavation
• Strong enough for use beneath driveways and car parks
• Modular design allows flexible tank layouts and hybrid builds
• Manufactured from over 90 percent recycled polypropylene
• Compatible with geotextile or geomembrane wrapped systems

Manufactured from controlled recycled polypropylene. This provides high structural strength, chemical resistance and long term durability in buried drainage applications.

Manufacturer: Polypipe
Product Code: PSM1A
Crate Dimensions: 1000mm x 500mm x 400mm
Unit Volume: 0.2 m³
Storage Volume: 190 litres
Void Ratio: 95 percent
Unit Weight: approx. 9 kg
Vertical Compressive Strength: up to 610 kN/m²
Lateral Load Capacity: 63 kN/m²
Maximum Burial Depth: up to 3.7 m (soil dependent)
Design Life: 60 years (creep limited)
Certification: BBA Approved Certificate 06/4297

Geotextile Membrane Option (Single Sheet Supply)

• Non woven geotextile membrane supplied as one pre cut sheet per order
• Sheet size matched to total number of crates ordered

Typical sheet sizes supplied

• 1 crate: 4.5 m² (2.25 m x 2.0 m)
• 3 crates: 7.87 m² (2.25 m x 3.5 m)
• 6 crates: 12.37 m² (2.25 m x 5.5 m)