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InteriorInterior
Rasogum+ – Ready-to-use Internal Waterproofing Membrane
Description

RASOGUM+ is a liquid-applied class III membrane that can be used for internal wet areas and complies with AS4858 for product performance.

A fast-drying, ready-to-use polymer-enhanced acrylic membrane that is both robust and flexible. With 400% elongation over both floor and wall substrates, screeds, floor levelling compounds, and under-tile heating, it will provide a fully sealed surface that can be tiled upon.

BRANZ Appraisal Certificate No. 542 Internal Waterproofing Membrane (E3B2).

Key Features
  • Part of the Technokolla system
  • BRANZ Appraised (Appraisal No. 542)
  • Single-component, ready-to-use waterproofing paste
  • Supports fibre reinforcement via embedded mesh for added crack-bridging strength
  • Suitable for use in accordance with TANZ Best Practice and IWAM Code of Practice
  • For use under tiles in bathrooms, showers, and laundries
  • Designed to achieve a minimum 1.0 mm dry film thickness in two coats
  • Meets EN 14891 waterproofing performance criteria when applied to recommended thickness
  • Crack-bridging support for cracks up to 1 mm
  • ~400% elongation (ISO 37) – excellent flexibility
  • High adhesion: 1.5 N/mm² after water immersion (EN 14891)
  • Eurofins A+ low VOC emission rating
  • Compatible with heated subfloors and common tile underlays
  • Can be applied by roller, brush, or trowel
  • Rapid drying time
  • Not suitable for immersed or submerged areas, use Rasolastik EVO or ADV instead
LBC Declare Red List Free
LBC Declare Red List Free
NZ-Owned Business
NZ-Owned Business
Scope of Use
  • Suitable for waterproofing internal wet areas in residential and commercial buildings
  • Ideal for use in bathrooms, showers, ensuites, laundries, and kitchens
  • For use on both floors and walls prior to tiling with ceramic, porcelain, or stone
  • Can be applied over concrete, screeds, fibre cement board, plasterboard, gypsum, and existing tiles
  • Compatible with under-tile heating systems
  • Suitable for new builds, renovations, and wet area remedial works
  • Supports compliance with NZBC Clause E3 Internal Moisture and B2 Durability
  • Appropriate for use in high-humidity zones and seismic environments
  • Can be installed over acoustic underlay or soundproofing systems
Limitations on Use
  • Not for external or immersed applications
  • Must not be applied over rising damp or unprimed bitumen/sealed coatings
  • Minimum dry film thickness 1 mm in two coats
  • Use only with compatible Technoklolla Primers
Statement of Building Code Compliance

When used in combination with approved waterproofing components, Rasogum+ supports compliance with the following New Zealand Building Code clauses:

  • B2 Durability – minimum 15-year durability for internal wet areas
  • E3 Internal Moisture – in accordance with AS/NZS 4858 and IWAM Code
  • F2 Hazardous Building Materials – classified A+ for low VOC emissions
In-Service History

Rasogum+ has been widely used throughout Europe and New Zealand in both residential and commercial internal wet area projects. It has a long-standing record of performance under tile finishes in bathrooms, laundries, and kitchens, and is trusted by architects, waterproofers, and tilers for reliable waterproofing outcomes.

In New Zealand, it is accepted by councils when used as part of internal waterproofing systems that include tested and BRANZ Appraised membranes. Its compatibility with New Zealand’s regulatory requirements, including NZBC Clause E3 Internal Moisture and guidance from the IWAM Code of Practice, supports its proven use on council-approved projects across the country.

Other Performance Attributes

Rasogum+ is a flexible and durable internal waterproofing membrane designed to accommodate substrate movement and thermal cycling, with resistance ranging from -30°C to +80°C. Once cured, it forms a seamless, water-resistant barrier that supports long-term protection beneath ceramic, porcelain, or stone tiles.

This low-odour, low-VOC membrane holds a Eurofins A+ rating, making it suitable for enclosed or sensitive indoor environments such as bathrooms, laundries, kitchens, and healthcare spaces. It contains no Red List materials and complies with NZBC Clause F2 for hazardous building materials.

Rasogum+ aligns with the IWAM Code of Practice and the TANZ Best Practice Guide for internal wet area waterproofing, ensuring consistency with recognised New Zealand installation standards. Its ease of application by brush, roller, or trowel delivers efficient coverage and strong substrate adhesion, and it is compatible with a wide range of tile adhesives and under-tile heating systems.

BRANZ Appraised
BRANZ Appraised
Documents
Manual: Commercial Interior Large Format Tiling

250901

Manual: Internal Tiled Wet Areas

251001

Data Sheet

01/25

Safety Data Sheet

Version 4.0; 28.10.2022

Specification for the Installation of 6mm Poreclain Tiles

250901

Installation of 6mm Porcelain Tiles

250901

Installation: Technokolla Tiling & Waterproofing System

251001

Technokolla’s tiling and waterproofing systems offer BRANZ-appraised performance for NZ residential & commercial projects, complying with NZBC, and IWAM best practice; backed by a 15 year warranty.

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