Off-site Intumescent
Coatings for
Structural Steel
Factory-applied intumescent coating for structural steel packages — helping contractors and fabricators reduce site delays, improve finish quality and keep fire protection works under control before steel arrives on site.
For main contractors · steel fabricators · developers · project teams
Intumescent coating should not become a site bottleneck.
Wet trades competing for site access
Weather and site-condition delays
Difficult sequencing around installed steel
Damage and rework risk after application
Programme pressure close to handover
Late-stage coordination issues between trades
Bare structural steel arrives at the facility
Beams, columns, trusses and cellular sections — scheduled into our shop programme alongside fabrication and blast.
Tested basecoat applied under controlled conditions
Humidity and temperature held in spec. Spray-applied intumescent basecoat to manufacturer DFT charts — every member, every face.
Dry film thickness measured on every member
Calibrated gauge readings recorded against the required thickness for the section and rating. No member ships without evidence.
RAL-matched topcoat, sequenced and despatched
Decorative topcoat to architect spec, packed and sequenced for the erection programme. Coatings off the critical path.
Coated before delivery. Controlled before site.
Coating steel under controlled facility conditions delivers a more consistent finish, removes weather risk and lets erection start with protection already in place — with the documentation pack ready before steel leaves the workshop.
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Steel is prepared and coated in a controlled off-site environment
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Dry film thickness planned against the fire strategy and specification
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QA and coating records prepared as part of the process
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Finished steel arrives ready for coordinated installation
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Reduced dependency on ideal site conditions
Best suited to steel packages where programme certainty matters.
Structural steel frames
Commercial developments
Industrial buildings
Refurbishment packages
Fabricator-led projects
Tight site access or sequencing
Projects where on-site coating would create programme risk
Built around how your team works.
Steel fabricators
Coating support before delivery — prepare steelwork for installation with a clearer route through fire protection requirements.
View fabricator supportMain contractors
Reduce site-phase coating issues, access constraints and programme disruption by moving suitable coating off-site.
View contractor supportDevelopers & PMs
Improve programme certainty and reduce late-stage fire protection coordination risk across structural steel packages.
View project supportFire consultants
Specification-led coating support aligned with fire strategy, steel sections and required performance.
View consultant supportFrom drawings to coated steel.
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Upload drawings, steel schedule or specification
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Midsummer reviews fire rating, steel sections and coating requirements
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Scope, programme and coating method are confirmed
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Steel is prepared and coated off-site
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QA records and project documentation are issued
QA, traceability and coating documentation.
Serious commercial buyers need evidence, not vibes. Every package leaves the facility with the records to back it up.
DFT checks
Product and system records
Batch references where applicable
Photo evidence
Project documentation pack
Alignment with fire strategy and specification
Traceability through to handover records
Tested coating systems
Off-site vs on-site intumescent coating.
| Factor | Off-site coating | On-site coating |
|---|---|---|
| Programme impact | Earlier in package | Often a later-stage dependency |
| Conditions | Controlled environment | Weather and site dependent |
| Access | Easier before installation | Can be restricted after install |
| Finish consistency | More controllable | More variable |
| Rework risk | Reduced if handled properly | Higher risk from other trades |
| Coordination | Planned before delivery | Dependent on site sequencing |
A Midsummer Fire Protection Service.
Off-site Intumescent is operated by Midsummer Fire Protection, supporting passive fire protection projects across commercial, industrial and residential schemes.
Where off-site coating is not suitable, Midsummer can advise on alternative passive fire protection routes, including on-site support, fire stopping, fire doors and wider project requirements.
Upload your drawings for an off-site coating review.
Send drawings, schedules or specification details — we'll review whether off-site intumescent coating is suitable for your project.
Submit package for review
Partial info is fine — we'll confirm what else is needed.
Off-site intumescent coating questions.
What is off-site intumescent coating?
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Off-site intumescent coating is the application of fire protection coating to structural steel before it reaches site, usually in a controlled workshop or preparation environment.
When is off-site coating better than on-site coating?
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It can be better where site access, weather, programme pressure or sequencing would make on-site coating difficult or risky.
What information is needed for a quote?
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Drawings, steel schedules, required fire rating, project location, programme dates and any relevant specification or fire strategy documents.
Can you work from a steel schedule?
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Yes — a steel schedule usually helps with the initial review, especially when paired with drawings or specification details.
What fire ratings can be supported?
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This depends on the steel sections, coating system, specification and project requirements. We review project information before confirming suitability.
Is off-site coating suitable for all steelwork?
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No. Some steelwork may be better handled on site depending on size, transport, installation method, damage risk or project constraints.
What documentation is provided?
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Coating records, DFT checks, product and system information, batch references where applicable, photo evidence and project-specific QA records.
Can Midsummer help if off-site coating is not suitable?
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Yes. Midsummer Fire Protection can advise on alternative passive fire protection routes where off-site coating is not the right fit.
Ready to check your steel package?
Send drawings, schedules or specification details and Midsummer will review whether off-site intumescent coating is suitable for your project.
Upload drawings / steel scheduleReviewed by the Midsummer coating team