Product Class

Product Description

Scope of use

Floors and stairs, including wet areas such as bathrooms and shower trays, when applied over a Ardex WPM155 internal waterproofing membrane.

Suitable for use on level access routes, including those expected to become wet with normal use.

Compatible with underfloor heating (hot water and electric) and areas subject to wheeled furniture traffic.

Not suitable for: sleeping areas where care or detention is provided, exitways, occupied spaces in importance level 4 buildings, or crowd/sleeping uses (except household units).

New Zealand Building Code (NZBC)

The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:

• Clause B2 Durability: Performance B2.3.1(c)

  B2.3.1(c) — Durability Basis: Testing and comparison with Verification Method B2/VM1. Cemher Microrock Microcement is based on microcement and sand with epoxy resins. It is unaffected by water, impermeable in bulk, and not affected by solvents or chemical compounds.

• Clause C3 Fire affecting areas beyond the fire source: Performance C3.4(a)

  C3.4(a) — Fire Basis: Testing and comparison with Acceptable Solutions C/AS1 and C/AS2. Cemher Microrock Microcement is classified B tested to EN 13501-1, taken to have Material Group number 1 (Building Product Specifications Table 8.5.3.1A).

• Clause D1 Access routes: Performance D1.3.3(d)

  D1.3.3(d) — Access Routes Basis: Testing and comparison with Acceptable Solution D1/AS1. Cemher Microrock Microcement has a slip resistance value SRV 41 and is suitable for use on access routes including those expected to become wet with normal use.

• Clause E3 Internal moisture: Performance E3.3.4, E3.3.5, E3.3.6

  E3.3.4–E3.3.6 — Internal Moisture Basis: Cemher Microrock Microcement is an over-surface finish. Compliance with E3.3.6 is provided by an underlying waterproof membrane complying with the IWMA Code of Practice (E3/AS2). Liquid water permeability of Microrock Base and Medium is classified "Low" per EN 1504-2:2004. Adhesion to ARDEX WPM155 has been independently pull-off tested and confirmed suitable (ARDEX NZ, June 2026).

• Clause F2 Hazardous building materials: Performance F2.3.1

  F2.3.1 — Hazardous Building Materials Basis: No harmful concentrations of gas, liquid, radiation, or solid particles are emitted or concentrated at the surface of Cemher Microrock Microcement.

Notes

B2 Durability (B2.3.1(c)) — per VM1: extensive European use history; unaffected by water, solvents, household chemicals. C3 Fire (C3.4(a)) — Class B (EN 13501-1), Material Group 1. D1 Access routes (D1.3.3(d)) — SRV 41, suitable for wet-use access routes. E3 Internal moisture (E3.3.4–E3.3.6) — over-surface finish; E3.3.6 compliance via underlying IWMA-compliant membrane (E3/AS2). Water permeability "Low" per EN 1504-2:2004. F2 Hazardous materials (F2.3.1) — no harmful emissions at surface.

Supporting evidence

The product has and can make available the following additional evidence to support the above statements:

Product Criteria

Design requirements

Cemher Microrock Microcement is suited to applications across floors, stairs and wet-areas. 

Available in a curated colour range; all top coats are pre-tinted by The Finish. Custom colour matching is available.

System total thickness is 3–4mm - allow for this height allowance in floor build-ups.

Suitable for use with underfloor heating and over existing tiles. Wheeled furniture is suitable.

Do not use as a crack filler or to fill significant holes, gaps, or joins.

Expansion joints must be respected and not filled completely.

Sample boards are recommended by the applicator prior to final colour selection, as tonal variation is natural to the system.

Contact The Finish for specification support and colour samples. thefinish.co.nz

Installation requirements

Cemher Microrock must be installed by a Cemher Certified Applicator in accordance with the Cemher Microrock Technical Data Sheet.

Substrate must be clean, dry, stable, and free from contaminants, with moisture content below 5% and a minimum compressive strength of 25N/mm².

Minimum application temperature 12°C.

Substrates include plasterboard (Level 4 finish required), Hardies, fibre cement board, render, painted surfaces, MDF, concrete and tiles (Hybrid system).

In wet areas, a compliant waterproofing membrane must be applied prior to microcement and must meet NZ standards. Cemher is compatible with Ardex WPM155 system. 

Allow minimum 7 days cure before use, water exposure, or foot traffic. Full hardness achieved at 30 days.

Maintenance requirements

Do not wet or clean the surface for 7 days post-installation.

Avoid cleaning products for the first 14 days. Clean routinely with water and a pH-neutral product using a damp cloth. 

Avoid acid-based, ammonia, chlorine, bleach, or abrasive cleaners. Do not allow water, food, or chemicals to sit on the surface for more than one hour.

Do not place hot objects directly on microcement - use heat-resistant mats. Lift rather than drag furniture; use protective pads under furniture legs. Prevent exposure to grit and abrasive particles.

The protective sealer is subject to normal wear and requires periodic reapplication - estimated every 2–4 years depending on use. Resealing must be carried out by a Cemher Certified Applicator using only Cemher-branded sealers; use of other products will void the warranty.

Regularly inspect the surface to assess sealer condition.

Compliance with these requirements is necessary to maintain the Cemher 10-year manufacturer's warranty.

Warrantees

Cemher Microrock is backed by a 10-year limited warranty, issued by The Finish Limited and governed by New Zealand law. The warranty covers manufacturing defects resulting in delamination from a properly prepared substrate, or water penetration through the fully cured and sealed system. Valid only when installed by a Cemher New Zealand Certified applicator, in accordance with current technical documentation, and where Cemher's maintenance and care guidelines are followed by the property owner. 

Building Product Information Requirements

Importer

Product Identifier

CEMHER MICRONE MICROCEMENT

Warnings

This product has no warnings associated with it.