Stormbloc® and Stormbloc® Extra are both part of our extended range of geocellular storage / infiltration blocks, along with the Stormbloc® Inspect chamber. 

Stormbloc® Extra is a high-strength block which is strong enough to install beneath heavily loaded areas, such as roads and car parks or for installations upto 4 m in depth.  

Stormbloc® is a lighter system which is ideal for installation in a broad range of schemes, including lightly trafficked and landscaped areas.  

You can find a like-for-like comparison table in the Stormbloc® Optimum brochure.

As a general rule, for a tank constructed with Stormbloc® the total excavation depth should not exceed 3 m.

Because of it's greater strength, for a tank constructed with Stormbloc® Extra the total excavation depth can be up to, but not exceed, 4 m.

Tank designs in excess of 3 m for Stormbloc® or 4 m for Stormbloc® Extra can often be achieved with a bespoke design from our design team. For further details, please call 01275 337937 or email stormwater@hydro-int.com

Stormbloc®

Storage volume for a single element (800 mm x 800 mm x 300 mm) is 0.203 m³
Storage volume for the base plate (800 mm x 800 mm x 30 mm) is 0.017 m³

Stormbloc® Extra

Storage volume for a full block (800 x 800 x 660 mm) is 0.405 m³
Storage volume for a half block (800 x 800 x 360 mm) is 0.221 m³

 The minimum cover level is dependent on the loading that the tank will be subject to and whether Stormbloc® or Stormbloc® Extra blocks are being used.

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For further details download the Stormbloc® Optimum brochure.

If you have any queries regarding cover levels, please contact the Hydro International team at stormwater@hydro-int.com

Stormbloc®

• Vertical ultimate compressive strength of 313 kN/m²
• Horizontal ultimate compressive strength of 93 kN/m²

Stormbloc® Extra

Full block

• Vertical ultimate compressive strength of 420 kN/m²
• Horizontal ultimate compressive strength of 165 kN/m²

Half block

• Vertical ultimate compressive strength of 420 kN/m²
• Horizontal ultimate compressive strength of 225 kN/m²

Stormbloc^®

Stormbloc^® elements are delivered stacked in compact nests on jumbo pallets with maximum dimensions of 1.6 m length x 0.8 m width and 1.5 m height.  Each pallet can hold a maximum of 26 Stormbloc^® elements or 92 base plates.

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Stormbloc^® Extra

The Stormbloc^® Extra blocks are delivered stacked into compact nests on jumbo pallets with maximum dimensions of 1.6 m length x 0.8 m width x 1.5 m height.  
Each pallet can hold max. 34 x Stormbloc^® Extra Elements.  

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