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US 400/420DB

US 400/420DB

Prefabricated Drainage Composite

US 400DB consists of a high flow dimpled drainage core formed from a moderate duty impermeable polymeric sheet cuspated under heat and pressure then bonded to a layer of non-woven filter fabric. The filter fabric retains soil and sand particles or freshly placed concrete or grout, allowing filtered water to pass into the drainage core. Collected water is then conveyed to the US SWD collection system.

US 400DB performs a multi-faceted role by providing protection for waterproofing systems and managing sub-surface water around building foundations. US 420DB has an added membrane protective film on the back side.

Property Test Method English Metric
Thickness - Core ASTM D-1777 0.4 in 10.16 mm
Compressive Strength - Core ASTM D-1621 15000 p/f² 718 kN/m²
Flow - Core ASTM D-4716 21 g/min/ft 260 l/min/m
Flow - Fabric ASTM D-4491 140 g/min/f² 5704 l/min/m²
Apparent Opening Size - Fabric ASTM D-4751 70 USSieve 0.212 mm
CBR Puncture - Fabric ASTM D-6241 250 lbs 1.113 kN
Grab Tensile - Fabric ASTM D-4632 100 lbs 0.45 kN
  • (1) At the time of manufacturing. Handling, storage, and shipping may change these properties.
  • (2) Maximum average roll value (MaxARV).
  • (3) Historical reference values. These properties are no longer recognized by ASTM or AASHTO for geosynthetics.

US 400/420DB Shipping & Packaging Information

Roll Size Roll Diameter Roll Width Roll Weight Rolls per Trailer
4' x 50' 20" 4' 41 lbs 265

US 400/420DB Installation and Use Instructions

This information is provided for reference only and is not intended as a warranty or guarantee. US Fabrics assumes no liability in connection with the use of this information.