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Proofex Cavitydrain 80

Proofex Cavitydrain 80

Fosroc International Limited Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

High density polyethylene (HDPE) profiled drained cavity former and damp proof membrane.

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Proofex Cavitydrain 80 is typically applied to the internal face of basement walls where Type C (Drained Cavity) protection is required either as the sole protective measure or in conjunction with Type A (Barrier) or Type B (Integral) waterproofing to achieve the required grade of protection in accordance with the recommendations of BS 8102.


Proofex Cavitydrain is a profiled HDPE membrane with ribbed conical voids spaced to permit high water flow through a permanent void against the sub-structure face.

Any water ingress through the structural concrete will not enter the internal environment because Proofex Cavitydrain provides a continuous water and damp proof drainage former to connect with drainage channels or outlets cast into the floor. Internal application in a controlled environment increases security against waterproofing failure.

Features and benefits:

  • Resistant to most acids, alkalis, oils and fuels.
  • Suitable for new and existing construction projects.
  • Acceptable for all water table classifications.

General information




High-density polyethylene (PE-HD)


A project specific warranty document for an agreed period for products supplied in accordance with a detailed specification document is available on request.



20 000 x 2070 x 0.5 mm


Pr_25_57_51_36 High-density polyethylene (PE-HD) studded sheetsPrimary


J40/290 High-density polyethylene/ polypropylene studded cavity drain membrane

Specification data - High-density polyethylene (PE-HD) studded sheets Enhanced data


To EN 13367.

Third-party certification

British Board of Agrément (BBA) Certificate.

Stud height

6.5 mm.

Sheet thickness

0.5 mm.

Weight (minimum)

0.45 kg/m².



Performance characteristics


Flow rate

To BS EN ISO 12958 at 20 kPa, 1.65 L/s.m (vertical), 0.30 L/s.m (horizontal).

Fire performance

To EN 13967, Class F.


Proofex Cavitydrain Sealing Tape.


30 mm minimum overlap between sheets.


Proofex Cavitydrain Fixing Plugs with Seals.

Tensile strength (minimum)

MD: 340 N/50mm, CMD: 225 N/50mm.

Tear resistance

290 N.


To ISO 25619-2, 200 kN/m.


Technical data sheet catalogue

Technical data sheet catalogue

Fosroc Expandite Waterproofing

Fosroc Expandite Waterproofing

Third party certifications

  • 17/5418

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