Drainage mat is a two part prefabricated sheet drain consisting of a dimpled high density polyethylene core covered on one side with a non-woven geotextile needle-punched polypropylene filter fabric. The fabric allows water to pass into the drain core while restricting the passage of fine particles, which may clog the core. The core allows water to flow to the designated drainage exits.

Standard product features

Roll Size:

50 x 1 m.

Roll weight:

  • 6 mm: 32 kg.
  • 12 mm: 52 kg.

Flow capacity at 100 kPa:

  • 6 mm: 0.30 litres/m/second.
  • 12 mm: 0.90 litres/m/second.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-65-50/354 Plastics or rubber studded sheets

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Radmat Building Products Ltd


+44 (0)1858 410372

Product reference

Drainage mat


[6 mm]
[12 mm]

Manufacturer details

Holland House,
Valley Way,
Rockingham Road,
Market Harborough,
Leicestershire, LE6 7PS
Tel +44 (0)1858 410372
Fax +44 (0)1858 410572
NBS Plus
NBS National BIM Library