NBS Source
PUDLO BW Membrane


  • For all aspects of waterproofing where a Grade 2 or Grade 3 environment is required as part of a single or dual system, recommended in BS 8102:2022.
  • Suitable for post- or pre-applied situations.
  • Can be used in horizontal or vertical applications and is suitable for basement construction, including lift pits, slabs, liner walls, capping beams and service penetrations.
  • Designed to be used in structural slabs, tunnels and property line construction.
  • Can be used in sprayed concrete applications, secant/ contiguous and sheet-piled design.


Sodium bentonite, high-strength, needle-punched geotextile membrane for use in waterproofing in underground, reinforced concrete structures. The membrane consists of two polypropylene geotextile layers, one woven and one non-woven, enclosing granular sodium bentonite at a minimum weight of 4.8 kg/m². The bentonite is encased within the layers, maintaining equal coverage and protecting it from construction-related damage.

Features and benefits:

  • A needle-punched, high-strength geotextile system.
  • Full surface contact between the impregnated cover layer and the PUDLO concrete ensures that small cracks and surface imperfections are sealed.
  • Forms a mechanical bond to poured concrete when cast in situ, remaining in place if settlement of the substrate occurs.
  • Self-healing.
  • Quick and easy installation (can be installed in all weather conditions).
  • BBA-accredited.
  • Peel adhesion to concrete (to ASTM D 903): 2.6 kN/m minimum.
  • Hydraulic conductivity to ASTM D 5084: 1.0 x 10-9 cm/s.

General information





5000 mm


1100 mm


20 year


Pr_15_57_27_39 Geosynthetic clay liners (GCLs)Primary


J40/285 Loose-laid bentonite damp-proofing/ tanking membranes

Specification data - Geosynthetic clay liners (GCLs) Enhanced data

Third party product certification

British Board of Agrément (BBA) Certificate.

Certificate: 17/5438.


4.8 kg/m².

Integral accessories

Not required.

PUDLO Membrane Granules.

PUDLO Membrane Seal.

Surestop Adhesive.

Surestop BWB.

Surestop SM.


8 kN/m.

Water permeability

<5 x 10 m/s-9.


7 mm.

Puncture resistance

1.5 kN.

To EN ISO 12236.

Hydrostatic resistance

70 m.

To ASTM D 5385.

Flexibility at low temperature

Unaffected at -32°C.

To ASTM D 1970.


Not required.

PUDLO Membrane Granules.

PUDLO Membrane Seal.

Surestop Adhesive.

Surestop BWB.

Show more


PUDLO Waterproof Concrete Brochure

PUDLO Waterproof Concrete Brochure

Membrane BW
Installation Manual

PUDLO Membrane BW Installation Manual

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

PUDLO Membrane BW BBA Certificate