Substrates and preparation

Repainting fire doors without compromising their certification

Fire door edge showing an intumescent seal being carefully worked around during repainting

A fire door is a certified assembly, not just a door with a label on it, and the coating specification needs to respect that. The wrong preparation approach can damage intumescent seals or strip a rated facing without anyone realising until an inspection flags it.

Questions we are asked about this

Can fire doors be painted the same way as ordinary internal doors?

No — intumescent seals and any labelling or certification marks need protecting, and preparation methods need to respect the rated construction.

Will repainting affect a fire door's certification?

Not if the coating is applied correctly and the intumescent components are left functional. Incorrect preparation or overpainting seals is what causes problems.

Can you provide records of the work for our fire safety file?

Yes, we can supply before-and-after photographs and notes on each door as part of the job for your records.

Knowing what not to touch

Intumescent strips set into the door edge or frame rebate are part of the fire performance and must not be painted over so thickly that they cannot expand, nor removed and refitted casually. We identify and work carefully around them rather than treating the door edge like standard joinery.

Sanding and preparation limits

Some fire door facings, particularly on composite or laminate-faced leaves, have limits on how much they can be sanded before the fire-rated core is compromised. Where we are not certain of the door's construction, we work conservatively rather than guess.

  • Intumescent seals left intact and unpainted where they need to expand
  • Sanding kept light on rated composite facings
  • Ironmongery and signage reinstated to the original specification

Keeping a record for the building's fire log

Photographs before and after, and notes on any door where something unusual was found, help a building's fire safety records stay accurate. We are happy to provide these to a managing agent or responsible person as part of the job.

How we work on this

  • We identify intumescent seals before starting and work around them deliberately.
  • We limit sanding on composite fire-rated facings rather than treating them like standard joinery.
  • We photograph and note fire door work for the client's own safety records.
Painter photographing a fire door before starting preparation for a building record

Tell us how many fire doors need attention and we will schedule the work with certification in mind from the outset.

Fire doors can be repainted safely, but only with preparation that respects their certified components.

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