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Appraisal number: 517 (2019)

Date issued: 14 Jun 2019

ProtectoWall® DPM Membrane


ProtectoWall® is a self-adhesive damp-proof membrane (DPM) designed to be applied to the exterior face of basement retaining walls to prevent water vapour penetrating to the interior face in spaces where moisture may cause damage. 

The product is supplied as self-adhering, cold-applied, polymer-rubber modified bitumen sheets in roll form.  


ProtectoWall® has been appraised as a damp-proof membrane behind concrete masonry basement walls and under floor slabs complying with NZS 4229.

ProtectoWall® has also been appraised for use as a damp-proof membrane on buildings subject to specific design within the following scope:

  • Where the design of the building will be the responsibility of the building designer.
  • With clean, sound, continuous substrates of in situ or precast concrete complying with NZS 3101 and AS/NZS 1170 or concrete masonry complying with NZS 4230 and 4210.
  • Where the membrane is adequately protected against damage during backfilling and in service.
  • Where subsoil drainage and free-draining granular backfill has been placed behind basement walls.

The product must be installed by Marshall Innovations Ltd approved and trained installers.

Technical literature

ProtectoWall Specification, MW PW 10/07/2012

Consenting instructions

Always refer to the Appraisal in full and the technical literature.

Appraisal holder

Marshall Innovations Ltd
Phone: 07 543 0948

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