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KalsiCTU fibre cement board is a great Ceramic Tile backer board for dry construction applications. Immune to long-term moisture exposure, KalsiCTU fibre cement boards do not feed or promote mould growth in humid areas. Its delamination strength, can be up to 70% higher than a water resistant plasterboard.

KalsiCTU fibre cement board, offers a very low moisture movement, which makes it a very stable and robust substrate for ceramic and stone tiling; the board will not bow or deform during service.

Key Features
  • Durable and impact resistant
  • Excellent strength and toughness
  • Not prone to warping or cracking
  • Boards come with a nail placement guide
Scope of Use

KalsiCTU is a 6mm thick autoclaved cellulose fibre-reinforced cement sheet available in the following sizes: 900mm (w) x 1200mm and 1800mm (l).

IBS supplies KalsiCTU fibre cement board (KalsiWAB) for use as

  • Internal dry wall
  • Internal and external ceiling panel
  • Floor and wall substrate lining (over an existing structural floor) and wall framing for wet areas
Limitations on Use

KalsiCTU is a base for laying ceramic tiles over a timber floor or reconstituted wood-based substrate.

  • in applications where a Material Group Number is required (clause C3.4(a)), the Kalsi fibre-cement board is at least 6mm thick and any waterborne or solvent borne paint coating is not greater than 0.4mm thick

Kalsi fibre-cement boards shall be installed in accordance with the installation instructions provided by IBS in its Installation Guide

Statement of Building Code Compliance

If designed, installed and maintained in accordance with all IBS requirements, the KalsiCTU product will meet the following provisions of the NZBC:

  • Clause B1 Structure — B1.3.1; B1.3.2; B1.3.3(b); B1.3.4 (B1.3.3(b) applies to KalsiCTU used as a tile floor underlay)
  • Clause B2 Durability — B2.3.1(b); B2.3.1(c) (B2.3.1(b) when used as a substrate for tile)
  • Clause C3 Fire affecting areas beyond the fire source — C3.4(a)
  • Clause E3 Internal moisture — E3.3.3 (contributes to); E3.3.4 (contributes to); E3.3.5 (contributes to); E3.3.6 (contributes to)
  • Clause F2 Hazardous Building materials — F2.3.1
  • Clause G3 Food preparation and prevention of contamination — G3.3.2(a) (Contributes to)
B1 Structure compliant
B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
E3 Internal Moisture compliant
Internal Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
G3 Food Preparation and Prevention of Contamination compliant
Food Preparation and Prevention of Contamination
Technical Data Sheet
CodeMark CM70106

CM70106 2022

Installation and Operation

Since 1993, IBS has been working with the top building products producers from around the world to bring New Zealand a panel product range to help Kiwis build better.

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