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Thermakraft Watergate Plus

Thermakraft Watergate Plus is a fire retardant absorbent breathable wall underlay. It is a white composite non-woven polypropylene, specifically designed as a wall underlay behind exterior wall claddings. Watergate Plus offers a high degree of water resistance, with a high level of water vapour permeability.

Key Features

Can be used as a wall Underlay on timber and steel framed buildings with absorbent and non-absorbent wall claddings direct fixed to framing:

  • Can be used as a Wall Underlay in a drained cavity
  • Can be used as an air barrier where walls are not lined (attic spaces, gable ends)
  • Suitable up to and including 'Very High' Building Wind Zones of NZS 3604
  • Unaffected by LOSP Timber
Scope of Use

Thermakraft Watergate Plus can be used as a wall underlay on timber and steel framed buildings within the following scope: 

  • The scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1, with regards to building height and floor plan area; and,
  • With absorbent wall claddings directly fixed to timber and steel framing; and,
  • With non-absorbent wall claddings directly fixed to timber and steel framing; and,
  • With absorbent and non-absorbent wall claddings installed over an 18mm minimum drained cavity;
  • With masonry veneer in accordance with NZS 3604, NZBC Acceptable Solution E2/AS1 for timber framed buildings, or specific engineering design for steel framed buildings; and,
  • Situated in NZS3604 Building Wind Zones up to, and including ‘Very High’ when used as a standalone flexible underlay, and “Extra High” when used as a flexible underlay over a rigid wall underlay.
  • Can be used as a non-rigid backing material for Stucco Plaster in accordance with the requirements of NZBC Acceptable Solution E2/AS1 Paragraph
  • The Underlay must be supported with 75mm galvanized mesh, or Thermakraft Stud Strap at 150mm centres run across cavity battens to limit deflection to a maximum of 5mm.
  • May also be used as a slip layer over rigid backing for Stucco Plaster in accordance with the requirements of NZBC E2/AS1 Paragraph 9.3.3(b).
  • Refer BRANZ Appraisal No 695 (2017) for full details.
  • May be used with LOSP treated timber.
  • Is suitable as an air barrier in unlined wall spaces.
  • Is suitable to be used in conjunction with thermal breaks on steel framed buildings.
  • Is suitable for direct fixing behind metal cladding
Statement of Building Code Compliance

Meets the Performance Requirements of NZBC Clauses B2, Durability (B2.3.1 (a) 50 years, B2.3.1 (b) 15 years and B2.3.2), E2 External Moisture (E2.3.2), and F2 Hazardous Building Materials F2.3.1, providing

  • It is not damaged
  • Installed in accordance with instruction guide
  • Is not left exposed for more than 90 days
  • Installed by or under guidance of Licensed Building Practitioners
  • Is compatible with cladding system used
Other Performance Attributes

Flammability Index:

  • Thermakraft Watergate Plus Wall Underlay has an AS 1530 Part 2 Flammability Index of not greater than 5 and therefore meets the requirements of NZBC

Acceptable Solutions C/AS2 to C/AS6, Paragraph 4.17.8 b), for the surface finish requirements of suspended flexible fabric used as an underlay to exterior cladding that is exposed to view in occupied spaces. It may therefore be used with no restrictions in all buildings.

BRANZ Appraised
BRANZ Appraised
Data Sheet

Issue 9, Sep 2021

Quick Reference Guide


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BRANZ Appraisal 695

No.695 [2023] 8 Feb 2023

BRANZ Appraisal 962 — Thermakraft One Wrap System

No.962 [2023] 22 Feb 2023

CodeMark Certificate

BRANZ-CM-1002 Rev 2

Data Sheet: Thermakraft One Wrap System

Issue 5, Sep 2020

Installation and Operation

Issue 4, Sep 2021

Kingspan Thermakraft Warranty Statement

Issue 3.1, Sep 2022

Kingspan are New Zealand’s leading provider of high-performance insulation products and complementary Thermakraft range of premium wall & roof underlay products, flashings tapes & underlay mesh.

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