Watertight Wall Underlay

Abbreviation
Appraisal number 939
Amendment
31 January 2019
Valid from
20/12/2017

Information provider
BRANZ Limited
Information type
BRANZ Appraisal
Format
PDF

Description

Watertight Wall Underlay is a synthetic wall underlay for use as a flexible wall underlay under wall claddings on timber and steel framed buildings. The product consists of a micro-porous water-resistant polypropylene film laminated between two layers of spun-bonded polypropylene and is coloured grey.

Scope

Flexible Wall Underlay

Watertight Wall Underlay has been appraised for use as a flexible wall underlay for 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 direct fixed absorbent and non-absorbent wall claddings; or,
  • with absorbent and non-absorbent wall claddings installed over an 18 mm minimum drained cavity; or,
  • with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 for timber framed buildings or to a specific design for steel framed buildings; and,
  • situated in NZS 3604 Wind Zones up to and including Very High.

Use over Rigid Wall Underlay

Watertight Wall Underlay has been appraised for use as a flexible wall underlay over rigid wall underlays 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 and non-absorbent wall claddings installed over an 18 mm minimum drained cavity; and,
  • with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 for timber framed buildings or to a specific design for steel framed buildings; and,
  • situated in NZS 3604 Wind Zones up to and including Extra High.

Specific Design

Watertight Wall Underlay has also been appraised for use on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of Watertight Wall Underlay into their design in accordance with the declared properties and the instructions of Techno Wrapping Systems Ltd.

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Watertight Wall Underlay

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Watertight Wall Underlay

Description

Watertight Wall Underlay is a synthetic wall underlay for use as a flexible wall underlay under wall claddings on timber and steel framed buildings. The product consists of a micro-porous water-resistant polypropylene film laminated between two layers of spun-bonded polypropylene and is coloured grey.

View on Information Provider website Download this resource (PDF, 193KB)
Watertight Wall Underlay
Description

Watertight Wall Underlay is a synthetic wall underlay for use as a flexible wall underlay under wall claddings on timber and steel framed buildings. The product consists of a micro-porous water-resistant polypropylene film laminated between two layers of spun-bonded polypropylene and is coloured grey.

View on Information Provider website Download this resource (PDF, 193KB)
This resource does not cite any other resources.

Watertight Wall Underlay

This resource does not CITE any other resources.
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