SpongeBase™ Retention & Detention

Increase Retention & Detention Without Sacrificing Accessibility and Aesthetics

Innovative

Hidden and invisible, SpongeBase™  (download brochure) provides source control by managing rainfall exactly where it lands on rooftop terraces, exposed balconies, walkways, and vegetation-free zones. The lightweight components are placed within the void space between the impervious surface and the roofing system where they receive rain that falls between the walkway’s joints.

Nature-Based Solution

The core of SpongeBase™ is a lightweight, fire resistant, highly absorbent needled mineral hydro blanket that evaporates stored water, returning it to the atmosphere via the natural hydrological cycle.

Key Features

  • Helps achieve water balance & quantity control targets
  • Hidden, non-vegetated system provides source control, on-site
  • Uses the void space between impervious surfaces & roofing system
  • Highly absorbent, it stores up to 6 times its own weight in water
  • Fire resistant, the hydro blanket distributes rainwater laterally
  • Can be customized to 75mm to meet water balance target
  • Ideal for rooftop terraces, exposed balconies, walkways & more
  • Reduces flooding, burden on sewer infrastructure & CSOs
  • Purple-Roof® Compliant

Choice of two: SpongeBase™ Retention or SpongeBase™ Detention

 

SpongeBase™ Retention

  • Retains up to 75 mm of rainfall to meet water balance target
  • Diverts runoff from and reduces the burden on the municipal sewer infrastructure
  • Cools building to save energy and mitigates the urban heat island
Product Code Product Name Metric Thickness (mm) Dry Wt. (kg/m2) Sat. Wt. (kg/m2) Water ret. (l/m2)
NL501 NM Hydro Blanket  25.80  3.90  28.80  24.90
NL310 Drainage Board  11.43  0.80 1.72  0.92
NL120 Root Barrier 0.50 0.46 0.46 0.00
 Total 37.73 5.16 30.98 25.82

SpongeBase™ Detention

  • Retains up to 75 mm of rainfall to meet water balance target
  • Detains up to 100 mm of rainfall for up to 24 hours to meet quality control target
  • Reduces burden on municipal sewer infrastructure, minimizes flooding and combined sewage overflow (CSO) downstream

 

Product Code Product Name Metric Thickness (mm) Dry Wt. (kg/m2) Sat. Wt. (kg/m2) Water ret. (l/m2)
 NL501 NM Hydro Blanket  25.80  3.90  28.80  24.90
NL351 Reservoir Cell  12.70  0.76  0.77  0.00
NL350 Detention Mat  5.00  0.40  0.80  0.40
NL120 Root Barrier  0.50  0.46  0.46  0.00
 Total 44.00 5.54 30.84 25.30

 

Technical Document Downloads

Extensive Systems

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