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E3 AS1 System: Luxury Vinyl Tile — Containment 12112021

An installation system for luxury vinyl tile (LVT) for wet rooms containment, for NZBC Alternative Solution E3/AS1 — Internal moisture for finishes to floors: Containment.

Containment being water from accidental overflow from a sanitary fixture that "could damage an adjoining household unit or other property". The affected areas are defined as having a sanitary fixture (e.g. toilet, sink, shower or bath) or sanitary appliance (e.g. washing machine or dishwasher).

  • Concrete Subfloor treated with Protect Crete Densi-Proof X200 or Moisture-Fix X220 at time of pour (optional)
  • RLA Flexi-Seal PUD Waterproof Membrane pre-primed with Roberts Universal Acrylic Primer
  • UZIN PE 280 Water Based Primer
  • Subfloor Preparation Systems Options (site specific as required)
    OPTION A: UZIN NC 160 Levelling Compound
    OPTION B: UZIN NC 182 Rapid Set Low Slump Mortar
    OPTION C: UZIN NC 888 Rapid Patching/Smoothing Compound
  • ADHESIVE OPTION 1: UZIN KE68T 1 Component Hybrid Adhesive
    ADHESIVE OPTION 2: UZIN KR430 2 Part Adhesive
  • Luxury Vinyl Tile (LVT) as Specified: Refer to supplier/ manufacturer regarding E3/AS1 code compliance
Key Features
  • Seamless Flooring System Components Compatibility
  • Incorporates Concrete Treatment for Relative Humidity (RH) Moisture Control and curing
  • Incorporates a BRANZ Appraised Waterproof Membrane System
  • Certified applicators provide Producer Statement to meet clause E3 Internal Moisture
  • Suitable for all NZ certified Luxury Vinyl Tiles
  • Masterspec ParnerNet Work Section Support
  • National supply of readily available trusted flooring preparation and installation systems product brands
  • Low VOC safe to use systems
Scope of Use

Must be read in conjunction with E3/AS1 November 4th 2021 Building Code — information is based on adhesive performance only to assist in the Alternative Solutions options for the installer

It is essential the LVT supplier provides their own documentation as to the floor coverings' suitability as required by E3/AS1

Limitations on Use
  • Interior use only
Statement of Building Code Compliance

Changes to E3/AS1 internal moisture building code for finishes to floors:

The Functional requirement given in the clause E3.2 is the "building must be constructed to avoid the likelihood of –

  • (a) Fungal growth or the accumulation of contaminants on linings and other building elements; and
  • (b) Free water overflow penetrating to an adjoining household unit; and
  • (c) Damage to building elements being caused by the presence of moisture."

There are two situations that need consideration when choosing flooring finishes.

  • 1. Containment — water from Accidental overflow from a sanitary fixture that "could damage an adjoining household unit or other property."
  • 2. Watersplash — "water can penetrate behind or under floor finishes in situations where watersplash occurs regularly (such as around shower enclosures or the fronts of built-in baths), unless these edges are sealed or coved."
In-Service History

For over fifty years Gilt Edge Industries has been a trusted national supplier of all the essential key elements of subfloor preparation and flooring installation. With 'best in class' supply partners assisting with specification development and technical advice, Gilt Edge Architectural services has evolved.

Gilt Edge support  projects with Masterspec PartnerNet Work Section Support. Gilt Edge Architectural now have four key sections in Masterspec:

  • 3124GE Gilt Edge Concrete Cure, Hardener, Moisture Control & Protection
  • 6122GE Gilt Edge Floor Levelling Systems
  • 6511GE Gilt Edge Residential and Commercial Underlay Systems
  • 6614GE Gilt Edge Stair Nosings, Transitions & Trim

Focus is to mitigate project risk, develop innovative solutions and ensuring the project installations are NZ Building Code/NZ Flooring Association Standards compliant.

Other Performance Attributes

UZIN Systems Components Green Star Compliant: Standards & Codes Recognising CDPH Standard Method V1.2 (partial list)

  • USGBC LEED Version 4, BD&C, ID&C
  • The WELL Building Standard
  • ANSI/GBI 01, Green Building Assessment Protocol

Flexi-Seal PUD Interior Waterproofing Membranes have been appraised for use as Waterproofing Membranes for the internal wet areas of buildings. 

  • BRANZ Appraisal No. 474 (2019) 


Supply partner product warranty applies to all seamless systems components.

BRANZ Appraised Flexi-Seal PUD Waterproof Membrane System: Licensed Applicator provides a Producer Statement for local authority sign off to achieve final Certificate of Compliance to meet Clause E3 Internal Moisture. 15 year product warranty applies.

System Overview


BRANZ Appraisal 474: Flexi-Seal System

474 [2019]

Gilt Edge on Masterspec
Flexi Seal PUD Waterproof Membrane
Protect Crete X200 Densi Proof
UZIN NC 170 Level Star
UZIN PE 280 Primer
UZIN PE 520 Primer

Gilt Edge Architectural partner with Architects and Specifiers nationally, to deliver trusted technical advice, and Seamless Flooring Systems Masterspec PartnerNet Specification writing assistance.

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