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Drainage and Water Attenuation Layer

CP660 is a low-profile, multi-layer drainage and water attenuation sheet for use as part of the TREMCO Green Roof System.

CP660 is used in conjunction with the CP250 waterproofing system.  Once installed over the cured membrane, CP660 protects the membrane from root penetration, provides a drainage layer to relieve excess rainwater and retains up to 7 litres per m² to sustain plant growth. 

  • Provides a low-profile drainage and water storage layer below green roof systems
  • Retains up to 7 litres of water per m² to sustain plant growth
  • Excellent flow capacity ensures effective drainage from the membrane
  • Extensive use of recycled material in production

Method of Application

CP660 is installed over the cured membrane. Refer to project installation instructions.

For full application details, contact tremco illbruck customer services on 01942 251400.

Technical data

Composition - CoreHigh Density Polyethylene (HDPE)
Composition - Upper TextileHeat-treated non-woven polypropylene
Composition - Lower TextileMixed polypropylene and recycled polymer blend
MassDry: 2.1 kg/m²
Wet: 10 kg/m²
Thickness (@2 kPa)32.7 mm
In-Plane Water Flow
(@20 kPa)

1.05 l/m.sec @ 1% HG
4.50 l/m.sec @ 10% HG

Water Storage Capacity7 l/m²
Compressive Strength250 kPa
Cbr Puncture Resistance6,200 N
Service Temperature Range-20°C TO +80°C
Chemical Resistance
(EN 14030)
Excellent resistance to common chemicals
StorageStore in shaded dry conditions between +5°C and +25°C
Shelf Life12 months when stored as recommended in original unopened containers
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