Structural Steel Protection

Structural Steel Protection

Structural Steel Protection

Passive fire protection materials insulate steel structures from the effects of the high temperatures generated in a fire.

They can be divided into two types, non-reactive and reactive.

Reactive Coatings

Gunfire’s fire stopping technicians can spray exposed structural steel beams to provide them with fire protection in a range of colours to fit with your needs and provide much-needed protection to structural steel that may become involved in a fire.

The thicker and heavier a steel section is, the longer it will take to heat up; therefore, the amount of structural fire protection required will be less than required for a lightweight steel section.

Gunfire refers to the ASFP Yellow Book to determine the correct thickness of any Third Party tested fire protection material and appropriate time of resistance.


Non-Reactive Methods

Non-Reactive methods typically include the use of boards and sprays.  Boards are widely used for structural fire protection in the UK. They are used both where the protection system is in full view and hidden. They offer the specifier a clean, boxed appearance and have the additional advantages that application is a dry trade and may not significantly impact other activities. Also, boards are factory manufactured, and thicknesses can be guaranteed. Furthermore, boards can be applied on unpainted steelwork.

There are broadly two families of board protection, lightweight and heavyweight. Lightweight boards are typically 150-250kg/m³ and are not usually suitable for decorative finishes. They are commonly used where aesthetics are not essential and are cheaper than heavyweight equivalents. Heavyweight boards are generally in the range of 700-950kg/m³ and generally accept decorative finishes. They are typically used where aesthetics are essential.


Gunfire works with the highest quality manufacturers and specifiers to ensure that the boarding system chosen will be designed & tested to suit the relevant building standards. We offer solutions on all project sizes, from small scale to large.

The fire protection system chosen will be governed by several items:

  • The level of fire resistance required
  • Appearance
  • Environmental conditions such as humidity and temperature during application
  • Lifetime to the first major maintenance period
  • Robustness
  • Consideration of future adaptions

All structural fire protection is applied to adhere to BS 476, Approved Document B and European Standards to EN 13381.

Our CSCS qualified operatives have the experience, training and qualifications to apply the complete range of intumescent coatings.  Gunfire has also developed a twelve-point checklist which all our operatives carry out before any works are handed over.  This checklist covers all the requirements needed to ensure the required fire resistance.

Coatings can be sealed with topcoats to most BS and RAL colours and also sprayed to a decorative finish if required.