Monokote® Z-146

Monokote® Z-146

GCP Applied Technologies

Designed for commercial and industrial steel framed structures, where impact and abrasion are likely. Used in fully exposed and external applications, e.g. manufacturing areas and semi-conductor plants.

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The product is able to withstand freeze-thaw, wind, rain and other climatic conditions.

It is lightweight, economical and fast to apply.

The use of an injection process at the gun head sets this material typically within 15 minutes. The sprayed material bonds tightly to the substrate forming a durable surface that does not dust or flake. The product may be sprayed or trowelled to various textures.

General information

Uniclass 2015

Pr_35_31_64_12 Cementitious rendersPrimary


M22/120 Sprayed

M22/130 Externally sprayed

Specification data - Cementitious renders

Product Reference

Monokote® Z-146


___ mm

30 minute fire rating to BS 476-21

60 minute fire rating to BS 476-21

90 minute fire rating to BS 476-21

120 minute fire rating to BS 476-21



Standard product features



Dry density:

640 kg/m³ (40 pcf).


To BS 476-4, Class 0.


Grey. Contact GCP for details of colour options.

Bonding agent:

Concrete substrates require the application of a suitable, approved bonding agent - seek advice from GCP.


Carry out before installation commences.

Internal applications:

Mechanical retention/ reinforcement: Not applicable.

External applications:

  • A protective coating on the structural steel is required, before the application of the fireproofing - seek advice from GCP for details of the recommended compatible coatings.
  • In a box configuration, stainless steel or vinyl coated galvanised lath is required.
  • The use of 6 mm weep holes is required to facilitate drainage of free water. Consult GCP for recommended installation guidelines.


  • All surfaces to receive spray applied fireproofing shall be provided free of oil, grease, paints/ primers, loose mill scale, dirt or other foreign matter which may impair proper adhesion.
  • All external steelwork to be coated shall be protected with a corrosion resistant paint system, as section M60
  • Other trades shall install clips, hangers, support sleeves and other attachments required to penetrate the fireproofing prior to application.
  • Other trades shall not install ducts, piping, equipment or other suspended items until the fireproofing is complete.
  • Complete placing of concrete on floor and roof decking prior to the application of the fire-protection to the underside of the deck, beams and joists.
  • Protect surfaces in the immediate spray area that are not to be coated with suitable masking, drop cloths or other satisfactory covering.


Not to begin until the contractor and applicator have determined that the surfaces are acceptable to receive the fireproofing material.

Temperature and ventilation:

  • An air and substrate temperature of 4.5°C minimum shall be maintained for 24 hours prior to application, during application and for a minimum 24 hours after application.
  • Provision shall be made for ventilation to properly dry the fireproofing after application. In enclosed areas lacking natural ventilation, air circulation and ventilation must be provided.

Finishing/ Sealing coat:

Seek advice from GCP.

Product Options


A minimum thickness of 10 mm is recommended and a thickness up to 84 mm can be applied. Alternatively, a fire rating to BS 476-21 (30 minutes-4 hours) can be specified. Refer to the Hp/A table supplied by GCP and/ or ASFP yellow book.

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