What is checked on a fire door inspection

Older doors are sometimes mistaken for fire doors because they look solid or heavy. To learn how to identify fire door construction, a specialist looks for a certification label or plug, usually set into the top edge or the hinge side. This small disc or sticker states the rating, such as FD30 for thirty minutes of resistance. If no label exists, the inspector examines the core material, the thickness and the construction method. Solid timber doors of a certain thickness may have been accepted under older standards, but modern assessments require proof of performance. In blocks across Sutton where original doors remain from decades ago, establishing whether a door meets current expectations is often the first entry on the remedial list. A [Fire Door Inspection in Sutton](/fire-safety/fire-door-inspection-sutton) covers these identification steps for every door in the common parts and at flat entrances.

The space between the door leaf and its frame matters because fire and smoke travel through gaps. Inspectors measure the gap at the top, the hinge side and the latch side using feeler gauges. The generally accepted fire door gap tolerance is 3mm, though up to 4mm may be recorded depending on the standard applied. Anything wider allows smoke to bypass the seal.

At the threshold, the gap depends on the floor covering. A hard floor might allow up to 8mm or 10mm, but carpet compresses, so the measurement changes. What gap around a fire door is considered too wide on an inspection depends on the specific doorset certificate. When gaps exceed limits, the report will note them for correction. Remedial work might involve adjusting hinges, planing the leaf or fitting a new frame. These measurements form a large part of any assessment carried out by a specialist firm working in Sutton flats and houses in multiple occupation.

Intumescent strips sit in grooves around the door leaf or within the frame. They stay dormant until heat activates them, causing the material to expand and seal the gap against fire. Many reports written after inspections in Sutton mention missing or damaged strips. My report mentions missing intumescent strips, can they be retrofitted to existing doors? Yes, a joiner can route a groove into an existing timber leaf or frame and fit new strips, provided the door has enough thickness and the original certification allows it.

Smoke seals are often combined with the intumescent strip in a single unit. If the brush or blade is worn flat, smoke will pass through even before the intumescent material expands. Arranging intumescent strip replacement in Sutton requires someone who understands which profile matches the door certificate. Using the wrong size or type invalidates the rating. The specialist firm handling the work will reference the manufacturer's data sheet before cutting any new grooves.

A fire door only works when it is shut. That is why closers are fitted to ensure the door returns to the frame after use. Do flat entrance doors in a Sutton block need self closing devices? Under the Fire Safety (England) Regulations 2022, responsible persons must check that flat entrance doors close properly. A flat entrance door closer required notation on a report means the existing device is absent, broken or adjusted incorrectly.

Inspectors test the closer by opening the door to various angles and watching it return. It must latch shut from any position without slamming so hard that it damages the frame. Overhead closers, concealed closers and perko-type chains all appear in local buildings, but not all provide adequate control. If residents have disconnected closers to make daily life easier, the report will flag this as a failure. Guidance on [self closing devices on flat entrance doors in Sutton](/latest/self-closing-devices-on-flat-entrance-doors-in-sutton) explains what duty holders must arrange.

Are the hinges and ironmongery part of the check, and what makes them fail? Hinges must carry a minimum melting point, typically above 800 degrees Celsius. An inspector counts them (three are standard for a fire door) and checks for worn pins, missing screws or signs of sagging. Does glazing in a fire door need to be a particular type, and can it be replaced on its own? Standard window glass shatters quickly in heat. If a vision panel cracks, a specialist glazier can replace just the pane using the correct intumescent glazing channel, provided the surrounding bead and timber are undamaged. The replacement must match the door's original specification exactly.