A fire-protection detail must describe a suitable system for the building and steelwork. A bare beam, decorative paint or an arbitrary board thickness is not enough information to establish the required performance.
Start with the responsible designer’s specification. It should identify the required performance and the arrangement being protected. This guide explains what to ask for and record; it does not select a fire-resistance period or a product thickness for your beam.
Understand what the specification is choosing
Passive protection can include board systems or protective coatings. The suitability of an assessed product depends on its stated application and the particular arrangement. A product’s headline fire rating is not a complete installation detail.
The SCI/BCSA fire-protection guide provides the technical context. The industry explanation of passive fire protection also describes the main approaches. Use the applicable manufacturer’s assessment and instructions for the system actually specified.
A board enclosure and a coating need different records
For an enclosure, the specification needs to resolve the board arrangement and its junctions and fixings. For a coating, it needs to resolve the specified preparation, compatible products and application requirements. Neither can be described adequately by “box it in” or “paint it”.
| Question | Information to request |
|---|---|
| What performance is required? | The designer’s requirement for this member and building |
| Which product system applies? | The assessed system and relevant supporting evidence |
| What arrangement was assessed? | Section and exposure conditions relevant to the specified application |
| How is it installed? | Current instructions covering preparation, application and details |
| How is completion recorded? | Agreed checks, product identification and installation records |
These are document questions, not a substitute specification. The responsible designer and installer must confirm the exact requirements.
Check compatibility before buying products
A proposed primer, finish or repair material may be outside the selected system. Send proposed substitutions to the responsible parties with the product information before purchase or application. Do not assume that two products are compatible because each is marketed for steel.
Connections and junctions also need a resolved detail. Ask how the system continues around plates, bolts and adjacent construction, and what happens at penetrations or later alterations. The outside dimensions of a beam do not describe these interfaces.
A practical handover record
Create a file for the specific member or group of members. Record the drawing revision, required protection, product system, supplier documents and the installer responsible for the work. Agree what inspection or measurement records are needed and when checks occur before concealment.
Keep dated photographs where useful, but do not treat photographs alone as proof of performance. Their purpose is to help identify what was installed and where. If damage or an alteration occurs later, the retained specification gives the responsible person a basis for deciding the repair.
Keep fire and corrosion requirements distinct
A corrosion-protection finish and a fire-protection system answer different questions. Where both are specified, their compatibility and sequence need to be established for the chosen products. Do not replace one with the other based on a generic description such as “protective paint”.
For regulatory guidance in England, start with Approved Document B and the relevant volume and amendments. Requirements differ with building type and jurisdiction, so this article does not claim one rule for every UK installation.
Earlier generic thickness and duration recommendations were removed from this page because they were not tied to a complete assessed system. Our beam calculators do not model elevated-temperature behaviour or fire resistance.
Structural work must be designed by a chartered structural engineer and receive the applicable Building Control approval. This article has not received an independent engineering review.