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Appraisal number: 723 (2017)

Date issued: 22 Nov 2017

AquaBlok Exterior Waterproofing Membranes


AquaBlok Exterior Waterproofing Membranes are single and two-part waterproofing membranes for use under ceramic or stone tile finishes on external decks and balconies.


AquaBlok Exterior Waterproofing Membranes have been appraised for use as deck and balcony waterproofing membranes for buildings within the following scope:

  • The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1.
  • The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1 with regards to building height and floor plan area when subject to specific engineering design.
  • With substrates of plywood, fibre-cement compressed sheet or suspended concrete slab.
  • With minimum falls for decks and balconies of 1:40.
  • With deck and balcony size limited to 40 m².
  • Situated in NZS 3604 wind zones up to and including extra high.

Decks and balconies must be designed and constructed in accordance with the following limitations:

  • With the membranes continually protected from exposure to ultraviolet (UV) light and from physical damage by ceramic or stone tile finishes.
  • With no steps within the deck level and no downpipes discharging directly onto the deck.

Movement and control joints in the substrate must be carried through the membranes and tile finish. The design and construction of the substrate and movement and control joints is specific to each building and is therefore the responsibility of the building designer and building contractor and is outside the scope of this Appraisal.

The ceramic or stone tile finishes are outside the scope of this Appraisal.

The membranes must be installed by trained installers approved by Sika (NZ) Ltd.

Technical literature

  • Technical Data Sheet AquaBlok Issue 1
  • Technical Data Sheet AquaBlok 2 Part, 17/04/2013
  • AquaBlok Elasto Joint Data Sheet, 1.5.2011
  • Technical Data Sheet AquaBlok WPU, 25/07/13

Consenting instructions

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

Appraisal holder

Sika (NZ) Ltd
Phone: 0800 SIKA NZ

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