Fire Door Gap & Intumescent Seal Maintenance in Dubai
Fire door gap and seal maintenance restores the two components that fail most often on rated doors. Clearance gaps around the leaf must stay within a small tolerance, usually a few millimetres, so an unlatched or oversized gap is corrected. Intumescent seals swell in heat to close that gap, and smoke seals block cold smoke — both perish, peel or get painted over and must be replaced with the correct product when they do. QSERV re-establishes gap tolerance and renews seals so the doorset performs as tested, then records the work.
DCD-approved · 12+ years in Dubai fire safety · Hassantuk-integrated · 18,000+ customers served
The weakest link on most fire doors
A fire door is only as strong as its weakest part, and on the majority of doors that part is the seal line or the clearance gap. Seals dry out, peel, get painted shut or are stripped during redecoration. Gaps open as leaves drop and frames move. Either fault opens a path for smoke long before the leaf itself is threatened.
- Missing or perished seals leave a clear path for smoke.
- Painted-over seals cannot swell to close the gap in heat.
- Oversized gaps stop seals bridging the space at all.
- A dropped leaf widens the gap unevenly around the edge.
- The leaf can look sound while the door has already failed.
Restore the gap, renew the seals
Correcting these is precise work, not a smear of sealant. QSERV measures the clearance around the whole leaf, brings it back within tolerance, and replaces intumescent and smoke seals with the correct product for the doorset — not whatever is on the van. The threshold gap is checked too, since that edge is often forgotten.
- Clearance measured around the full perimeter of the leaf.
- Gaps brought back within the required tolerance.
- Intumescent seals renewed with the matching product.
- Cold smoke seals fitted where the doorset requires them.
- Threshold and meeting-stile gaps checked, not just the sides.
A fix you can show, not just feel
Restored seals and gaps are only credible if they are documented. QSERV records which doors were corrected, what was replaced, and the clearances achieved, so the work stands up in a compliance review and feeds the door's ongoing maintenance history rather than being forgotten by the next inspection.
- Each corrected door recorded with the work done.
- Replaced seal type and gap results logged.
- Findings aligned to Dubai Civil Defence expectations.
- Feeds the doorset's ongoing maintenance history.
- Repeat-offender doors flagged for closer monitoring.
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Frequently Asked Questions
Answers for building managers dealing with failed or missing fire door seals and gaps in Dubai.
What is an intumescent seal?
An intumescent seal is a strip fitted to the edge of a fire door or its frame that swells when heated, expanding to close the gap around the leaf and hold back fire. Without it, or if it is painted over, the door cannot seal the opening as it was tested to.
How big a gap is allowed around a fire door?
The clearance around a rated leaf must stay small — typically a few millimetres and consistent around the edge. An oversized or uneven gap lets smoke pass and can stop the seals bridging the space, so it is measured and corrected during maintenance.
Why do fire door seals need replacing?
Seals perish, peel, get painted over during redecoration, or are stripped out entirely. Any of these stops them doing their job, so they are replaced with the correct product for the doorset rather than patched, which would not restore the rated performance.
Can you correct an oversized gap without replacing the door?
Often, yes. A dropped leaf, worn hinges or a moved frame can widen the gap, and adjusting or re-hanging the leaf and renewing the seals frequently restores tolerance. Where the leaf or frame is damaged beyond adjustment, QSERV will say so rather than mask it.
Is the correct seal product important?
Yes. A fire door is a tested assembly, so seals must match what keeps the rating valid — the right intumescent and, where needed, cold-smoke type for that doorset. Fitting a generic strip may look right but does not guarantee the tested performance.
Do you record the seal and gap work?
Yes. QSERV logs each corrected door, the seals replaced and the clearances achieved, so the fix stands up in a compliance review and feeds the door's maintenance history. All work is done in-house with no subcontracting.