The new cables are live, the desks have internet again and somebody is waiting to put the final ceiling tile back. From below, the job looks finished. Above the tile sits the bit that deserves another five minutes.
The drawing shows a wall. The site shows three cables and a pipe drilled straight through it, with daylight around the lot. That little shortcut has now joined two spaces which were meant to stay apart.
A passive fire protection specialist looks beyond whether the cable works. For them, a live connection proves only that the electrician has finished. The wall around it has a different job.
1. What is the wall, exactly?
Collar? Batt? Mortar? Not yet. Plasterboard, masonry or concrete comes first, followed by the rating it is supposed to achieve. Then look at the condition. The smartest detail will not rescue a wall that is already falling apart.
Products are tested as part of systems. Swapping the wall, service, gap or support arrangement may change what can be used.
“It is fire rated” is the beginning of a conversation, not the end.
2. Look at everything inside the opening
One neat metal pipe is simple enough to describe. On site, the lonely pipe from the detail drawing often arrives with plastic services, lagging, a cable tray, brackets and one mystery cable nobody will claim.
Write down what is there and where the supports sit. Measure the spaces, including those between services. If the cable bundle has been squeezed into one corner, the tidy example in the product literature may be of little use.
Packed solid? Leave it alone until a workable tested arrangement has been found. A pretty after-photograph is no substitute.
3. Check both sides where possible
The front can look immaculate. Behind the riser panel might be quite another story. A camera’s reach is not the boundary of the defect, however awkward the access becomes.
Plan access before work begins. That could mean removing a panel, arranging entry to another room or using a suitable inspection method. Record any limits clearly rather than quietly treating unseen as satisfactory.
There is no shame in “not inspected”. There is a problem with pretending it means “no defect”.
4. Photograph the context first
A close image of finished fire stopping proves very little if nobody can tell where it was taken. Start wide enough to show the location, then move in for the opening and the installed detail.
Give the image a code that exists on the drawing. Room names have a habit of changing halfway through a refurbishment; a location code is harder to lose.
Take the photograph before the ceiling closes. This sounds obvious until everybody is packed up and the only evidence shows a clean white tile.
5. Keep other trades from undoing the work
The seal is complete on Monday. Wednesday arrives with one more cable. It gets fed through Monday’s work and leaves a gap that looks harmless from the floor.
Tell every trade before this happens: once the opening is sealed, alterations are controlled work. Change it and both the repair and register need another visit.
Hand over something the site team can use without phoning three people: the location, what went in and a contact for future changes.
BSML is FIRAS accredited. Door work sits beside penetration sealing, cavity barriers, surveys, compartmentation and damper remedials in its service range. Crews attend occupied and specialist sites in London, the Home Counties and farther afield.
Five minutes before the tile goes back
Pause and ask the boring questions. Is this the correct wall? Are all services included? Does the installed system match its tested detail? Have the photographs and location reference been saved?
If the answer is unclear, the ceiling can wait. Opening it again next week will take longer, particularly after the access tower has gone and the room is full of staff.
The cable working is one successful part of the job. The compartment remaining intact is another. Both deserve checking before somebody below says, “Looks good,” and presses the final tile into place.
