Transport, Handling & Site Touch-Ups: Protecting Intumescent Integrity After Delivery

Fire protection does not end at the factory gate.

Off-site intumescent coating delivers control, consistency, and evidence — but those qualities are only preserved if the coated steel is transported, handled, and installed with the same discipline that created it. The journey from factory floor to final position is one of the most underestimated risk phases in passive fire protection.

Damage at this stage is rarely dramatic.

It is cumulative, localised, and often ignored.

Yet every scrape, chip, and exposed edge represents a break in the fire protection system — and therefore a break in the fire strategy.

Why Post-Delivery Control Matters

Fire tests assume continuity. They do not allow for abrasion from chains, impact from forks, or abrasion during erection. Once the coating is damaged, the test evidence no longer applies at that location.

The risk is not the existence of damage — some damage is inevitable — but the failure to control, repair, and record it correctly.

Post-delivery control is therefore not a logistical concern.

It is a life-safety obligation.

Transport — Preserving What the Factory Achieved

Load Planning and Protection

Coated steel must be treated as a finished product, not raw material. Transport planning should minimise contact points and prevent movement during transit.

Effective measures include:

• Use of soft slings or padded restraints

• Timber spacers between members

• Avoidance of steel-on-steel contact

• Securing loads to prevent vibration and shift

Chains, bare straps, and uncontrolled stacking introduce predictable damage.

Environmental Exposure in Transit

Intumescent coatings are cured before dispatch, but exposure to rain, condensation, or road contaminants during transport can still compromise the surface.

Weather protection during transit is essential, particularly for long journeys or winter conditions.

Handling on Site — The Highest Risk Phase

Lifting and Manoeuvring

Most damage occurs during lifting. Fork tines, chains, hooks, and uncontrolled rotation concentrate load at edges and corners — precisely where coatings are thinnest and most vulnerable.

Controlled handling requires:

• Agreed lifting plans

• Use of approved lifting points

• Soft slings rather than chains

• Supervised operations by trained personnel

Speed increases damage. Control reduces it.

Storage Prior to Erection

Temporary storage is often overlooked. Coated steel left on uneven ground, stacked incorrectly, or exposed to weather is almost guaranteed to suffer damage.

Storage must ensure:

• Members are raised off the ground

• Timber bearers are used consistently

• Stacking does not load coated faces

• Protection from standing water and debris

If storage conditions cannot be controlled, erection should follow delivery as closely as possible.

Recognising Acceptable Damage

Not all damage requires remediation, but all damage requires assessment.

Minor scuffs that do not breach the coating thickness may be acceptable. Chips exposing primer or steel are not.

Assessment must consider:

• Depth and extent of damage

• Location relative to critical steel sections

• Whether DFT remains compliant

Assumption has no place here. Measurement decides.

Site Touch-Ups — Repair Without Compromising the System

Approved Repair Materials

Touch-ups must use materials approved by the intumescent manufacturer. Substituting site-applied products without compatibility confirmation risks creating a weak interface.

Repairs must restore:

• Adhesion

• Required DFT

• Continuity of the system

Cosmetic covering is not repair.

Surface Preparation for Repairs

Before repair, damaged areas must be:

• Cleaned of debris and loose coating

• Dry and free from contamination

• Prepared to allow proper adhesion

Painting over damaged areas without preparation compounds failure.

Controlled Application and Curing

Repairs must be applied under suitable environmental conditions and allowed to cure fully. Rushed repairs are often worse than the original damage.

Verification After Touch-Up

DFT Measurement

Repaired areas must be measured and verified to ensure required DFT is restored. Visual acceptance is insufficient.

Documentation and Traceability

Every repair must be recorded:

• Location and extent of damage

• Repair method and materials

• Post-repair DFT readings

• Photographic evidence

This information must be integrated into the Golden Thread.

Coordination and Responsibility

Who Owns the Repair

Responsibility for damage must be clear. Whether repairs are carried out by the coating contractor, main contractor, or specialist depends on contractual arrangements — but accountability must not be ambiguous.

Unowned damage becomes undocumented damage.

Designers and Inspectors

Designers and inspectors must understand where off-site coating ends and site responsibility begins. Interfaces must be identified early and managed deliberately.

Common Post-Delivery Failures

Repeated issues seen across sites include:

• Chains used instead of slings

• Forks contacting coated flanges

• Steel stored directly on ground

• Touch-ups using incompatible products

• Repairs undocumented or unmeasured

These failures are not inevitable. They are procedural.

Conclusion — Protection Must Survive the Journey

Off-site intumescent coating delivers fire resistance under controlled conditions. Transport, handling, and site touch-ups test whether that control extends beyond the factory.

Fire protection is not a moment of application.

It is a condition that must be preserved.

Every stage after delivery either maintains integrity or erodes it. When damage is controlled, repaired correctly, and documented, the fire strategy remains intact. When it is ignored or disguised, compliance becomes fragile.

The coating does not forget how it was treated.

And fire will reveal every place where care ran out.