Fire Stop Mortar & Shaft Closing — Simfy Firesys Hyderabad

Shaft systems

Fire Stop Mortar & Shaft Closing in Hyderabad

A cable shaft runs the whole height of your building. If it is open at each floor, it is the fastest route a fire will ever find. We close it, floor by floor, and photograph every one.

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Ameetuff fire mortar applied over mesh in a cable shaft — **Mortar, at the tested thickness**Over rebar, mesh and packed mineral wool — not straight onto the opening.

UL Listed

Armacell fire stop systems

CBRI

CBRI Certified

Ameetuff mortar & coatings

NBC
IV

NBC Part-IV

Documented to the standard

✓

Photographed

Before, during and after

In one paragraph

What it actually is.

Shaft closing means sealing the opening where cables and pipes pass from one floor to the next, so fire and smoke cannot climb. We use CBRI certified Ameetuff fire retardant mortar over a steel and mesh backing, packed with high-density mineral wool. Every seal is photographed and recorded against the tested system it follows.

The shaft is the part of a building nobody photographs and everybody forgets. It is behind a door on each floor, full of cable trays and pipes, and during construction it is deliberately left open so the MEP teams can pull services through. The problem is what happens after they finish. If nothing closes that opening, hot smoke from a fire on the third floor reaches the twelfth in a couple of minutes — long before flame does, and long before anyone upstairs has smelled anything. Closing the shaft is not glamorous work and it is not expensive relative to the building. It is simply the single highest-value thing you can do to stop a small fire becoming a building-wide one.

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Fire Stop Mortar and Shaft Closing in Hyderabad — Simfy Firesys

Detail

What actually goes into a shaft seal

Steel first, not mortar firstMortar has nothing to hold on to across a wide opening. We fix reinforcement bars across the shaft so there is a skeleton. Skip this and the seal cracks and drops the first time the building moves.

Mesh so it does not fall throughFire-rated mesh is laid over the bars. It holds the wet mortar in place while it sets and gives the finished slab its shape.

Mineral wool, packed tightHigh-density mineral wool fills the space around every cable and pipe. Loose packing leaves air paths, and air paths carry smoke.

Mortar to the tested thicknessAmeetuff fire retardant mortar goes on to the thickness the tested system specifies. Thinner is cheaper and it does not work. We measure it.

A top coat and a photographThe surface is closed and the seal is photographed with its location written down, so the next person to open it knows what they are opening.

On site

Where this goes wrong on real sites

A cable added after the sealSomeone pulls one more cable through a finished seal six months later and patches it with whatever is in the van. That patch is not a fire stop. It should be re-sealed to the same system and photographed again.

Foam used as a fire stopOrdinary expanding foam looks like a seal and burns like a candle. If you can see yellow or orange foam around a cable bundle in a fire-rated wall, it is not doing the job.

Mixed services in one openingA tested system covers a specific combination — this pipe, this size, this barrier. Put a plastic pipe, a cable bundle and a duct through one hole and the detail that was approved no longer applies.

No record of what was usedSix months later, nobody can say which product went in, how thick, or where. That is the same as not having done it, because it cannot be proven to a regulator or an insurer.

FAQ

Questions we get asked about this

How long does shaft closing take per floor?It depends on the opening size and how congested the services are, but a typical shaft on one floor is a day's work including preparation and curing time before the top coat. We usually run several floors in parallel so the building is not disrupted for long.

Can you do this in a building that is already occupied?Yes — most of our shaft work is in buildings that are already running. The shaft is behind a service door, so the disruption is limited to that riser. We agree access windows first and work to them.

What if cables need to be added later?Tell us before the work starts if you expect future cable pulls. There are systems built to be re-opened — pillows and re-enterable barriers — and we would use those in that riser instead of a solid mortar seal.

Is mortar the only option?No. Mortar suits large shaft openings. Smaller penetrations are better served by sealants, wraps or pillows. We pick per opening rather than using one product everywhere.