US Fabrics

Use our search, it WORKS!

Better Business Bureau  
  • > Spec Interpretation
  • > Product Application
  • > Pricing & Availability
  • > Product Comparison


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.

US 400/420DB
US 400/420DB Test Results
Property Test Method English Metric
Compressive Strength - CoreASTM D-162115,000 p/f²718 kN/m²
Thickness - CoreASTM D-17770.40 in10.16 mm
Flow - CoreASTM D-471621 g/min/ft260 l/min/m
Flow - FabricASTM D-4491140 g/min/f²5,704 l/min/m²
CBR Puncture - FabricASTM D-6241250 lbs1.113 kN
Apparent Opening Size - FabricASTM D-475170 US Sieve0.212 mm
Grab Tensile - FabricASTM D-4632100 lbs0.45 kN
US 400/420DB Shipping & Packaging
Roll Sizeselect roll size from this list ->
Roll Diameter 20.0 in
Roll Width 4'
Roll Weight 39/41 lbs
Rolls per Trailer 265
AASHTO Plain Drainage
Geocomposite Drain

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 (1/2020).